liu.seSearch for publications in DiVA
Change search
Link to record
Permanent link

Direct link
Publications (3 of 3) Show all publications
Pshyk, O. V., Li, X., Petrov, I., Sangiovanni, D. G., Palisaitis, J., Hultman, L. & Greczynski, G. (2023). Discovery of Guinier-Preston zone hardening in refractory nitride ceramics. Acta Materialia, 255, Article ID 119105.
Open this publication in new window or tab >>Discovery of Guinier-Preston zone hardening in refractory nitride ceramics
Show others...
2023 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 255, article id 119105Article in journal (Refereed) Published
Abstract [en]

Traditional age hardening mechanisms in refractory ceramics consist of precipitation of fine particles. These processes are vital for widespread wear-resistant coating applications. Here, we report novel Guinier-Preston zone hardening, previously only known to operate in soft light-metal alloys, taking place in refractory ceramics like multicomponent nitrides. The added superhardening, discovered in thin films of Ti-Al-W-N upon high temperature annealing, comes from the formation of atomic-plane-thick W disks populating {111} planes of the cubic matrix, as observed by atomically resolved high resolution scanning transmission electron microscopy and corroborated by ab initio calculations and molecular dynamics simulations. Guinier-Preston zone hardening concurrent with spinodal decomposition is projected to exist in a range of other ceramic solid solutions and thus provides a new approach for the development of advanced materials with outstanding mechanical properties and higher operational temperature range for the future demanding applications.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Guinier-Preston zone, TiAlN, Ceramics, Age hardening, Spinodal decomposition
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-196410 (URN)10.1016/j.actamat.2023.119105 (DOI)001025995100001 ()
Note

Funding: Swedish Research Council VR [2018-03957, 2021-03652, 2021-04426]; Swedish Energy Agency [51201-1]; Knut and Alice Wallenberg Foundation [KAW2019.0290, CTS 20:150]; Carl Tryggers Stiftelse [21:1272, 2017-00646_9]; Swedish Research Council VR-RFI [VR-2018-0597]; Swedish Foundation for Strategic Research [2021-00171]; Swedish Research Council [RIF21-0026]; Swedish National Infrastructure in Advanced Electron Microscopy [22-4, 2022-03071]; Aforsk Foundation; Competence Center Functional Nanoscale Materials (FunMat-II) VINNOVA;  [KAW2016.0358];  [RIF14-0053]

Available from: 2023-08-01 Created: 2023-08-01 Last updated: 2023-08-31
Rogoz, V., Pshyk, O. V., Wicher, B., Palisaitis, J., Lu, J., Primetzhofer, D., . . . Greczynski, G. (2023). High-mass metal ion irradiation enables growth of high-entropy sublattice nitride thin films from elemental targets. Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, 41(6), Article ID 063108.
Open this publication in new window or tab >>High-mass metal ion irradiation enables growth of high-entropy sublattice nitride thin films from elemental targets
Show others...
2023 (English)In: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 41, no 6, article id 063108Article in journal (Refereed) Published
Abstract [en]

Synthesis of high-entropy sublattice nitride (HESN) coatings by magnetron sputtering is typically done using custom-made alloyed targets with specific elemental compositions. This approach is expensive, requires long delivery times, and offers very limited flexibility to adjust the film composition. Here, we demonstrate a new method to grow HESN films, which relies on elemental targets arranged in the multicathode configuration with substrates rotating during deposition. TiVNbMoWN films are grown at a temperature of similar to 520(degrees)C using Ti, V, Nb, and Mo targets operating in the direct current magnetron sputtering mode, while the W target, operated by high power impulse magnetron sputtering (HiPIMS), provides a source of heavy ions. The energy of the metal ions EW+ is controlled in the range from 80 to 620 eV by varying the amplitude of the substrate bias pulses V-s, synchronized with the metal-ion-rich phase of HiPIMS pulses. We demonstrate that W(+ )irradiation provides dynamic recoil mixing of the film-forming components in the near-surface atomic layers. For EW+ >= 320 eV the multilayer formation phenomena, inherent for this deposition geometry, are suppressed and, hence, compositionally uniform HESN films are obtained, as confirmed by the microstructural and elemental analysis.(c) 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license(http://creativecommons.org/licenses/by/4.0/)

Place, publisher, year, edition, pages
A V S AMER INST PHYSICS, 2023
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-198948 (URN)10.1116/6.0003065 (DOI)001084540600001 ()
Note

Funding Agencies|SSF; Swedish Research Council VR; Swedish Energy Agency; aforsk Foundation [UKR22-0031]; Knut and Alice Wallenberg (KAW) Foundation [2018-03957]; Swedish Research Council VR-RFI [51201-51201]; Wallenberg Initiative Materials Science for Sustainability (WISE) - Knut and Alice Wallenberg Foundation [22-4]; Knut and Alice Wallenberg Foundation [CTS 20:150]; Swedish National Infrastructure in Advanced Electron Microscopy [2019_00191]; Polish National Agency for Academic Exchange; [2021-00171]; [RIF21-0026]; [BPN/BEK/2021/1/00366/U/00001]

Available from: 2023-11-06 Created: 2023-11-06 Last updated: 2024-05-01
Greczynski, G., Pshyk, O. V. & Hultman, L. (2023). Toward an increased reliability of chemical bonding assignment in insulating samples by x-ray photoelectron spectroscopy. Science Advances, 9(37), Article ID eadi3192.
Open this publication in new window or tab >>Toward an increased reliability of chemical bonding assignment in insulating samples by x-ray photoelectron spectroscopy
2023 (English)In: Science Advances, E-ISSN 2375-2548, Vol. 9, no 37, article id eadi3192Article in journal (Refereed) Published
Abstract [en]

X-ray photoelectron spectroscopy (XPS) spectra from solid samples are conventionally referenced to the spectrometer Fermi level (FL). While, in the case of metallic samples, alignment of the sample and the spectrometer FLs can be directly verified from the measured Fermi edge position, thus allowing to assess the surface electrical potential, this is not a workable option for insulators. When applied, it generates a large spread in reported binding energy values that often exceed involved chemical shifts. By depositing insulating amorphous alumina thin films on a variety of conducting substrates with different work functions, we show not only that FL referencing fails but also that the Al2O3 energy levels align instead to the vacuum level, as postulated in the early days of XPS. Based on these model experiments that can be repeated for all sorts of thin-film insulators, a solution to the binding energy reference problem is proposed for reliable assessment of chemical bonding.

Place, publisher, year, edition, pages
AMER ASSOC ADVANCEMENT SCIENCE, 2023
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:liu:diva-198677 (URN)10.1126/sciadv.adi3192 (DOI)001068543100013 ()37713479 (PubMedID)
Note

Funding Agencies|Swedish Research Council VR [2018-03957]; Swedish Energy Agency [51201-1]; Knut and Alice Wallenberg Foundation [KAW2019.0290]; Carl Tryggers Stiftelse [CTS 20:150]; aforsk Foundation [22-4]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoeping University [2009-00971]

Available from: 2023-10-23 Created: 2023-10-23 Last updated: 2024-05-01
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9237-6512

Search in DiVA

Show all publications