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Naumovska, E., Nzulu, G. K., Mazzei, L., Le Febvrier, A., Komander, K., Magnuson, M., . . . Karlsson, M. (2024). Local structure of hydrated nanocrystalline films of the proton conductor BaZr1-Sc O3-/2 studied by infrared spectroscopy. Vibrational Spectroscopy, 130, Article ID 103622.
Open this publication in new window or tab >>Local structure of hydrated nanocrystalline films of the proton conductor BaZr1-Sc O3-/2 studied by infrared spectroscopy
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2024 (English)In: Vibrational Spectroscopy, ISSN 0924-2031, E-ISSN 1873-3697, Vol. 130, article id 103622Article in journal (Refereed) Published
Abstract [en]

We report results from a study of the local structure of hydrated nanocrystalline 2 �m films of the well known proton conductor BaZr1-xScxO3-x/2 with x = 0.45, 0.54 and 0.64, using infrared (IR) spectroscopy. The films were prepared by magnetron sputtering. Analysis of the IR spectra focused on the O–H stretching region (2000—3700 cm-1), which reveals the presence of several distinct O–H stretching bands for which the intensity and frequency of each band vary in an unsystematic manner with Sc concentration. The spectra for the two higher Sc concentrations, x = 0.54 and 0.64, exhibit a distinct, highly intense O–H stretching band centered at around 3400–3500 cm-1, which is assigned to relatively symmetric, weakly hydrogen-bonding, proton configurations. The spectrum for the lower Sc concentration, x = 0.45, does not feature such a band but a broader, weaker, O–H stretching band between approximately 2500 and 3700 cm-1, suggesting that the protons are more homogeneously distributed over a range of different local proton coordinations in this relatively weakly doped material. A comparison to the IR spectra of powder samples of similar compositions suggests that for x = 0.45, the spectra and proton coordination of films and powder samples are similar, whereas for x = 0.54 and 0.64, a larger fraction of protons seems to be located in weakly hydrogen-bonding proton configurations in the films compared to the respective powder samples.

Place, publisher, year, edition, pages
Elsevier, 2024
Keywords
Proton conducting oxide; FilmsInfrared spectroscopy; Fuel cell; O-H stretch vibration
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:liu:diva-199473 (URN)10.1016/j.vibspec.2023.103622 (DOI)001128254500001 ()
Note

Funding: Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]; Knut and Alice Wallenberg Foundation through the Wallenberg Academy Fellows program [2020.0196]; Swedish Energy Agency [43606-1, 48712-1]; Carl Trygger Foundation [CTS20:272, CTS16:303, CTS14:310]; VR-RFI [2017-00646-9, 2019-00191]; SSF [RIF14-0053]

Available from: 2023-12-04 Created: 2023-12-04 Last updated: 2024-01-17
Nzulu, G. K., Naumovska, E., Karlsson, M., Eklund, P., Magnuson, M. & le Febvrier, A. (2023). Growth and thermal stability of Sc-doped BaZrO3 thin films deposited on single crystal substrates. Thin Solid Films, 772, Article ID 139803.
Open this publication in new window or tab >>Growth and thermal stability of Sc-doped BaZrO3 thin films deposited on single crystal substrates
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2023 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 772, article id 139803Article in journal (Refereed) Published
Abstract [en]

Thin films of BaZr1-xScxO3-x/2, (0 ≤ x ≤ 0.64), well known as proton conducting solid electrolytes for intermediatetemperature solid oxide fuel cell, were deposited by magnetron sputtering. X-ray diffraction analysis of theas deposited films reveals the presence of single-phase perovskite structure. The films were deposited on fourdifferent substrates (c-Al2O3, LaAlO3〈100〉, LaAlO3〈110〉, LaAlO3〈111〉) yielding random, (110)- or (100)-orientedfilms. The stability of the as-deposited films was assessed by annealing in air at 600 ◦C for 2 h. Theannealing treatment revealed instabilities of the perovskite structure for the (110) and randomly oriented films,but not for (100) oriented film. The instability of the coating under heat treatment was attributed to the lowoxygen content in the film (understoichiometry) prior annealing combined with the surface energy and atomiclayers stacking along the growth direction. An understoichiometric (100) oriented perovskite films showedhigher stability of the structure under an annealing in air at 600 ◦C.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Perovskite;Temperature annealing; X-ray diffraction; Magnetron sputtering;Thin films; Oxygen deficient oxide; Proton conductor application
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-192551 (URN)10.1016/j.tsf.2023.139803 (DOI)000959375300001 ()
Note

Funding agencies: Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No. 2009 00971), the Knut and Alice Wallenberg foundation through the Wallenberg Academy Fellows program (KAW-2020.0196), and the Swedish Energy Agency through Grant No. 48712-1 (E.N., M.K., P. E., A. l. F) and 43606-1 (G.K.N., M.M.). M.M. also acknowledges financial support from the Carl Trygger Foundation (CTS20:272, CTS16:303, CTS14:310)

Available from: 2023-03-21 Created: 2023-03-21 Last updated: 2023-04-18
Nzulu, G. K., Högberg, H., Eklund, P., Hultman, L., Nude, P. M., Yaya, A. & Magnuson, M. (2023). Pathfinder elements and indicator minerals of Au from the Kubi Gold ore deposits in Ghana. Environmental Earth Sciences, 82(16), Article ID 386.
Open this publication in new window or tab >>Pathfinder elements and indicator minerals of Au from the Kubi Gold ore deposits in Ghana
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2023 (English)In: Environmental Earth Sciences, ISSN 1866-6280, E-ISSN 1866-6299, Vol. 82, no 16, article id 386Article in journal (Refereed) Published
Abstract [en]

The Au mineralization in the Kubi Gold Mining Area in the Birimian of Ghana is associated with garnet (about 85 vol.%), magnetite, pyrrhotite, arsenopyrite, and sulfide minerals, as well as quartz with gold and calcite. These minerals and the included elements can act as indicator minerals or pathfinder elements. For the present work, we collected samples from drill holes at different depths, from the alluvial zone (0–45 m) to the ore zone (75–100 m). The distributions of minerals and elements in the rocks that act as indicator minerals and pathfinder elements in the concession area were investigated along the drill hole cross sections. X-ray diffraction shows that the samples contain garnet, pyrite, periclase, and quartz as the main indicator minerals. By energy-dispersive X-ray spectroscopy, Fe, Mg, Al, S, O, Mn, Na, Cu, Si, and K are identified as corresponding pathfinder elements. The results indicate that the Au mineralization in the Kubi Mine area correlates mostly with the occurrence of garnet, pyrite, goethite, and kaolinite in the host rocks, which show towards the surface increasingly hematitic and limonitic alteration in form of Fe(oxy-)hydroxides.

Place, publisher, year, edition, pages
Springer, 2023
Keywords
Pathfinder element, X-ray, Spectroscopy, Birimian, Gold
National Category
Geology
Identifiers
urn:nbn:se:liu:diva-196461 (URN)10.1007/s12665-023-11058-z (DOI)001041675600003 ()
Funder
Linköpings universitet, Faculty Grant SFO-Mat-LiU no. 2009 00971Carl Tryggers foundation , CTS20:272,CTS16:303, CTS14:310
Note

Funding agencies:Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU no. 2009 00971).Swedish Energy Research(Grant no. 43606-1)Carl Tryggers Foundation (CTS20:272,CTS16:303, CTS14:310)Open access funding provided by Linköping University

Available from: 2023-08-07 Created: 2023-08-07 Last updated: 2023-09-14Bibliographically approved
Ji, F., Klarbring, J., Zhang, B., Wang, F., Wang, L., Miao, X., . . . Gao, F. (2023). Remarkable Thermochromism in the Double Perovskite Cs2NaFeCl6. Advanced Optical Materials, Article ID 2301102.
Open this publication in new window or tab >>Remarkable Thermochromism in the Double Perovskite Cs2NaFeCl6
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2023 (English)In: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, article id 2301102Article in journal (Refereed) Epub ahead of print
Abstract [en]

Lead-free halide double perovskites (HDPs) have emerged as a new generation of thermochromic materials. However, further materials development and mechanistic understanding are required. Here, a highly stable HDP Cs2NaFeCl6 single crystal is synthesized, and its remarkable and fully reversible thermochromism with a wide color variation from light-yellow to black over a temperature range of 10 to 423 K is investigated. First-principles, density functional theory (DFT)-based calculations indicate that the thermochromism in Cs2NaFeCl6 is an effect of electron–phonon coupling. The temperature sensitivity of the bandgap in Cs2NaFeCl6 is up to 2.52 meVK−1 based on the Varshni equation, which is significantly higher than that of lead halide perovskites and many conventional group-IV, III–V semiconductors. Meanwhile, this material shows excellent environmental, thermal, and thermochromic cycle stability. This work provides valuable insights into HDPs' thermochromism and sheds new light on developing efficient thermochromic materials.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2023
National Category
Physical Chemistry
Identifiers
urn:nbn:se:liu:diva-197177 (URN)10.1002/adom.202301102 (DOI)001049682400001 ()
Funder
Knut and Alice Wallenberg Foundation, Dnr. KAW 2019.0082Swedish Energy Agency, 2018‐004357Swedish Research Council, 2021‐00357Swedish Research Council, 2019–05551Swedish Research Council, 2022–06725Swedish Research Council, 2018–05973
Note

Funding agencies: This work was financially supported by the Knut and Alice Wallenberg Foundation (Dnr. KAW 2019.0082), the Swedish Energy Agency (2018-004357), Carl Tryggers Stiftelse, Olle Engkvist Byggmästare Stiftelse, and the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No. 2009-00971). I.A.A. is a Wallenberg Scholar. B.B. gratefully acknowledges financial support from the Swedish Research Council (VR) grant no. 2021-00357. F.J. was supported by the China Scholarship Council (CSC). W.N. acknowledges the Suzhou Key Laboratory of Functional Nano & Soft Materials, the Collaborative Innovation Center of Suzhou Nano Science & Technology (NANO−CIC), and the 111 Project for the financial support. S.I.S. acknowledges the support from the Swedish Research Council (VR) (Project No. 2019–05551) and the ERC (synergy grant FASTCORR project 854843). The computations were enabled by resources provided by the National Academic Infrastructure for Supercomputing in Sweden (NAISS), the Swedish National Infrastructure for Computing (SNIC) at the National Supercomputer Center (NSC), and the Center for High Performance Computing (PDC), partially funded by the Swedish Research Council through Grant Agreements No. 2022–06725 and No. 2018–05973. F.W. gratefully acknowledges financial support from the Open Project Funding of Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices, Soochow University (KJS2152), and the Formas (2020-03001). M.M. acknowledges financial support from Swedish Energy Research (Grant no. 43606-1) and the Carl Tryggers Foundation (CTS20:272, CTS16:303, CTS14:310).

Available from: 2023-08-24 Created: 2023-08-24 Last updated: 2023-09-13
Shu, R., Zhang, X., Tasnadi, F., Olovsson, W., Gangaprasad Rao, S., Greczynski, G., . . . Eklund, P. (2023). Stoichiometry Effects on the Chemical Ordering and Superconducting Properties in TiZrTaNbNx Refractory High Entropy Nitrides. Annalen der Physik, Article ID 2300470.
Open this publication in new window or tab >>Stoichiometry Effects on the Chemical Ordering and Superconducting Properties in TiZrTaNbNx Refractory High Entropy Nitrides
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2023 (English)In: Annalen der Physik, ISSN 0003-3804, E-ISSN 1521-3889, article id 2300470Article in journal (Refereed) Epub ahead of print
Abstract [en]

High-entropy materials, an exciting new class of structural materials involvingfive or more elements, are emerging as unexplored ground forsuperconductors. Here, the effects of nitrogen stoichiometry are investigatedon local chemical structure of TiZrNbTa-based thin films by variousX-ray-based techniques. Lattice distortion and short-range order of a set ofTiZrNbTaNxsamples, including bond lengths of different atomic pairs andcoordination numbers of substituting atoms are quantitatively studied. Themaximum superconducting transition temperature Tcis found at 10 K for anear-stoichiometric (TiZrNbTa)N1.08film, which is>8 K measured for ametallic TiZrNbTa film. The underlying electronic structure and chemicalbonding in these high entropy nitrides thus influence the superconductingmacroscopic properties.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2023
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-199850 (URN)10.1002/andp.202300470 (DOI)001130119800001 ()
Note

Funding agencies: the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No. 2009 00971), the VINNOVA Competence Centre FunMat-II (grant no. 2016–05156), the Knut and Alice Wallenberg foundation through the Wallenberg Academy Fellows program (KAW-2020.0196), and the Swedish Research Council under project number 2021–03826. Financial support for the operation of the accelerator laboratory in Uppsala by VR-RFI (Contract No. 2017-00646_9) and the Swedish Foundation for Strategic Research (SSF, Contract No. RIF14-0053), the Swedish Energy Research (Grant No.43606-1) and the CarlTryggers Foundation (CTS23:2746, CTS20:272, CTS16:303, CTS14:310).The authors acknowledge the MAX IV Laboratory for beamtime on the BALDER beamline for proposal 20200219. Research conducted at MAX IV, a Swedish national user facility, was supported by the Swedish Research council under contract 2018–07152, the Swedish Governmental Agency for Innovation Systems (VINNOVA) under contract 2018–04969, and Formas under contract 2019–02496. 

Available from: 2023-12-28 Created: 2023-12-28 Last updated: 2024-01-16
Rogström, L., Moreno, M., Andersson, J. M., Johansson-Jöesaar, M. P., Odén, M., Klementiev, K., . . . Magnuson, M. (2023). Structural changes in Ti1-xAlxN coatings during turning: A XANES and EXAFS study of worn tools. Applied Surface Science, 612, Article ID 155907.
Open this publication in new window or tab >>Structural changes in Ti1-xAlxN coatings during turning: A XANES and EXAFS study of worn tools
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2023 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 612, article id 155907Article in journal (Refereed) Published
Abstract [en]

Structural changes in Ti1-xAlxN coated tool inserts used for turning in 316L stainless steel were investigated by XANES, EXAFS, EDS, and STEM. For coarse-grained fcc-structured Ti1-xAlxN coatings, with 0 ≤ x ≤ 0.62, the XANES spectrum changes with Al-content. XANES Ti 1s line-scans across the rake face of the worn samples reveals that TiN-enriched domains have formed during turning in Ti0.47Al0.53N and Ti0.38Al0.62N samples as a result of spinodal decomposition. The XANES spectra reveal the locations on the tool in which the most TiN-rich domains have formed, indicating which part of the tool-chip contact area that experienced the highest temperature during turning. Changes in the pre-edge features in the XANES spectra reveal that structural changes occur also in the w-TiAlN phase in fine-grained Ti0.38Al0.62N during turning. EDS shows that Cr and Fe from the steel adhere to the tool rake face during machining. Cr 1s and Fe 1s XANES show that Cr is oxidized in the end of the contact length while the adhered Fe retains in the same fcc-structure as that of the 316L stainless steel.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
TiAlN, XAS, XANES, Metal cutting, Hard coatings
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-190421 (URN)10.1016/j.apsusc.2022.155907 (DOI)000901825100002 ()
Note

Funding agencies: Swedish Governmental Agency for Innovation Systems (Vinnova) [2018-04417]; VINNOVA [2016-05156]; Swedish Research council [2018-07152]; Swedish Governmental Agency for Innovation Systems [2018-04969]; Formas [2019-02496]

Available from: 2022-12-08 Created: 2022-12-08 Last updated: 2023-02-20Bibliographically approved
Näslund, L.-Å. & Magnuson, M. (2023). The Origin of Ti 1s XANES Main Edge Shifts and EXAFS Oscillations in the Energy Storage Materials Ti2CTx and Ti3C2T x MXenes. 2D Materials, 10(3), Article ID 035024.
Open this publication in new window or tab >>The Origin of Ti 1s XANES Main Edge Shifts and EXAFS Oscillations in the Energy Storage Materials Ti2CTx and Ti3C2T x MXenes
2023 (English)In: 2D Materials, E-ISSN 2053-1583, Vol. 10, no 3, article id 035024Article in journal (Refereed) Published
Abstract [en]

A potential application of two-dimensional (2D) MXenes, such as Ti2CTx and Ti3C2Tx, is energy storage devices, such as supercapacitors, batteries, and hydride electrochemical cells, where intercalation of ions between the 2D layers is considered as a charge carrier. Electrochemical cycling investigations in combination with Ti 1s x-ray absorption spectroscopy have therefore been performed with the objective to study oxidation state changes during potential variations. In some of these studies Ti3C2Tx has shown main edge shifts in the Ti 1s x-ray absorption near-edge structure. Here we show that these main edge shifts originate from the Ti 4p orbital involvement in the bonding between the surface Ti and the termination species at the fcc-sites. The study further shows that the t2g–eg crystal field splitting (10Dq) observed in the pre-edge absorption region indicate weaker Ti–C bonds in Ti2CTx and Ti3C2Tx compared to TiC and the corresponding MAX phases. The results from this study provide information necessary for improved electronic modeling and subsequently a better description of the materials properties of the MXenes. In general, potential applications, where surface interactions with intercalation elements are important processes, will benefit from the new knowledge presented.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2023
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-194566 (URN)10.1088/2053-1583/acd7fe (DOI)001003150900001 ()
Note

Funding agencies: the Swedish Research council under contract 2018-07152, the Swedish Governmental Agencyfor Innovation Systems under Contract 2018-04969,and Formas under Contract 2019-02496. We also thank the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-MatLiU No. 2009 00971). M M acknowledges financial support from the Swedish Energy Research (Grant No. 43606-1) and the Carl Tryggers Foundation (CTS20:272, CTS16:303, CTS14:310). The FEFF calculations of scattering paths were performed using supercomputer resources provided by the National Academic Infrastructure for Supercomputing in Sweden (NAISS) at Linköping University funded by the Swedish Research Council through GrantAgreement No. 2022-06725

Available from: 2023-06-08 Created: 2023-06-08 Last updated: 2023-07-03
Chowdhury, S., Hjort, V., Shu, R., Greczynski, G., Le Febvrier, A., Eklund, P. & Magnuson, M. (2023). Thermoelectric properties and electronic structure of Cr(Mo,V)Nx thin films studied by synchrotron and lab-based x-ray spectroscopy. Physical Review B, 108(20), Article ID 205134.
Open this publication in new window or tab >>Thermoelectric properties and electronic structure of Cr(Mo,V)Nx thin films studied by synchrotron and lab-based x-ray spectroscopy
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2023 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 108, no 20, article id 205134Article in journal (Refereed) Published
Abstract [en]

Chromium-based nitrides are used in hard, resilient coatings and show promise for thermoelectric applications due to their combination of structural, thermal, and electronic properties. Here, we investigate the electronic structures and chemical bonding correlated to the thermoelectric properties of epitaxially grown chromium-based multicomponent nitride Cr(Mo,V)Nx thin films. The small amount of N vacancies causes Cr 3d and N 2p states to appear at the Fermi level and reduces the band gap in Cr0.51N0.49. Incorporating holes by alloying of V in N-deficient CrN results in an enhanced thermoelectric power factor with marginal change in the charge transfer of Cr to N compared with Cr0.51N0.49. Further alloying of Mo, isoelectronic to Cr, increases the density of states at the Fermi level due to hybridization of the (Cr, V) 3d and Mo 4d-N 2p states in Cr(Mo,V)Nx. This hybridization and N off-stoichiometry result in more metal-like electrical resistivity and reduction in Seebeck coefficient. The N deficiency in Cr(Mo,V)Nx also depicts a critical role in reduction of the charge transfer from metal to N site compared with Cr0.51N0.49 and Cr0.50V0.03N0.47. In this paper, we envisage ways for enhancing thermoelectric properties through electronic band engineering by alloying and competing effects of N vacancies.

National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-199216 (URN)10.1103/physrevb.108.205134 (DOI)
Funder
Linköpings universitet, 2009 00971Knut and Alice Wallenberg Foundation, KAW-2020.0196Swedish Research Council, 2021–03826Swedish Research Council, 2022–00213Swedish Research Council, 2018–07152Swedish Research Council, 2022–06725Swedish Research Council, 2019–00191Swedish Energy Agency, 43606–1Swedish Energy Agency, 51201–1Carl Tryggers foundation , CTS20:272Carl Tryggers foundation , CTS16:303Carl Tryggers foundation , CTS14:310Vinnova, 2018–04969Swedish Research Council Formas, 2019–02496
Available from: 2023-11-20 Created: 2023-11-20 Last updated: 2023-11-20
Magnuson, M., Hultman, L. & Högberg, H. (2022). Review of Transition-Metal Diboride Thin Films. Vacuum, 196, Article ID 110567.
Open this publication in new window or tab >>Review of Transition-Metal Diboride Thin Films
2022 (English)In: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 196, article id 110567Article, review/survey (Refereed) Published
Abstract [en]

We review the thin film growth, chemistry, and physical properties of Group 4-6 transition-metal diboride (TMB2) thin films with AlB2-type crystal structure (Strukturbericht designation C32). Industrial applications are growing rapidly as TMB2 begin competing with conventional refractory ceramics like carbides and nitrides, including pseudo-binaries such as Ti1-xAlxN. The TMB2 crystal structure comprises graphite-like honeycombed atomic sheets of B interleaved by hexagonal close-packed TM layers. From the C32 crystal structure stems unique properties including high melting point, hardness, and corrosion resistance, yet limited oxidation resistance, combined with high electrical conductivity. We correlate the underlying chemical bonding, orbital overlap, and electronic structure to the mechanical properties, resistivity, and high-temperature properties unique to this class of materials. The review highlights the importance of avoiding contamination elements (like oxygen) and boron segregation on both the target and substrate sides during sputter deposition, for better-defined properties, regardless of the boride system investigated. This is a consequence of the strong tendency for B to segregate to TMB2 grain boundaries for boron-rich compositions of the growth flux. It is judged that sputter deposition of TMB2 films is at a tipping point towards a multitude of applications for TMB2 not solely as bulk materials, but also as protective coatings and electrically conducting high-temperature stable thin films.

Place, publisher, year, edition, pages
Elsevier, 2022
Keywords
Diborides; Thin film growth; Phase diagrams; Density functional theory; Properties
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-178819 (URN)10.1016/j.vacuum.2021.110567 (DOI)000747123500004 ()
Note

Funding: Swedish Energy Research [43606-1]; Carl Tryggers Foundation [CTS20:272, CTS16:303, CTS14:310]; Swedish Government Strategic Research Area in Materials Science on Advanced Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]; Knut and Alice Wallenberg Foundation, Project Grant (The Boride Frontier) [KAW 2015.0043]; Swedish Research Council (VR)Swedish Research Council [621-2010-3921]; AForsk Foundation [16-430]

Available from: 2021-08-31 Created: 2021-08-31 Last updated: 2022-02-11Bibliographically approved
Nzulu, G., Eklund, P. & Magnuson, M. (2021). Characterization and identification of Au pathfinder minerals from an artisanal mine site using X-ray diffraction. Journal of Materials Science, 56(12), 7659-7669
Open this publication in new window or tab >>Characterization and identification of Au pathfinder minerals from an artisanal mine site using X-ray diffraction
2021 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 56, no 12, p. 7659-7669Article in journal (Refereed) Published
Abstract [en]

Gold-associated pathfinder minerals have been investigated by identifying host minerals of Au for samples collected from an artisanal mining site near a potential gold mine (Kubi Gold Project) in Dunkwa-On-Offin in the central region of Ghana. We find that for each composition of Au powder (impure) and the residual black hematite/magnetite sand that remains after gold panning, there is a unique set of associated diverse indicator minerals. These indicator minerals are identified as SiO2 (quartz), Fe3O4 (magnetite), and Fe2O3 (hematite), while contributions from pyrite, arsenopyrites, iridosmine, scheelite, tetradymite, garnet, gypsum, and other sulfate materials are insignificant. This constitutes a confirmative identification of Au pathfinding minerals in this particular mineralogical area. The findings suggest that X-ray diffraction could also be applied in other mineralogical sites to aid in identifying indicator minerals of Au and the location of ore bodies at reduced environmental and exploration costs.

Place, publisher, year, edition, pages
Springer, 2021
Keywords
Au, gold, mining, X-ray diffraction, minerals, magntite, hematite, quartz
National Category
Geosciences, Multidisciplinary
Identifiers
urn:nbn:se:liu:diva-173165 (URN)10.1007/s10853-020-05681-5 (DOI)000607036900008 ()2-s2.0-85099343303 (Scopus ID)
Available from: 2021-02-07 Created: 2021-02-07 Last updated: 2023-02-17Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-0317-0190

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