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Microstructure/dielectric property relationship of low temperature synthesised (Na,K)NbOx thin films
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics.ORCID iD: 0000-0002-1744-7322
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2004 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 262, no 1-4, 322-326 p.Article in journal (Refereed) Published
Abstract [en]

Thin films of (Na,K)NbOx (NKN) were grown by reactive RF magnetron sputtering on polycrystalline Pt80Ir20 substrates, at relatively low growth temperatures between 300°C and 450°C. The results show that the electrical performance and the microstructure of the films are a strong function of the substrate temperature. X-ray diffraction of films grown up to 400°C revealed the formation of only one crystalline NKN-phase with a preferred (0 0 2)-orientation. However, a mixed orientation together with a secondary, paraelectric potassium niobate phase, were observed for NKN films deposited at 450°C. The differences in the microstructure explains the variations in the dielectric constants and losses: The single phase NKN films displayed a dielectric constant and a dielectric loss of 506 and 0.011, respectively, while the films with mixed phases exhibited values of 475 and 0.022, respectively. The possibility of fabricating NKN films with relatively high dielectric properties at low growth temperatures, as demonstrated here, is of high technological importance.

Place, publisher, year, edition, pages
2004. Vol. 262, no 1-4, 322-326 p.
Keyword [en]
A1. Characterization, A3. Physical vapor deposition processes, B1. Niobates, B2. Dielectric materials
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-45820DOI: 10.1016/j.jcrysgro.2003.10.035ISI: 000189098700050OAI: oai:DiVA.org:liu-45820DiVA: diva2:266716
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
In thesis
1. Colloidal Synthesis and Characterisation of (a) Na0.5K0.5NbO3 Thin Films; and (b) Functionalised Gd2O3 Nanocrystals
Open this publication in new window or tab >>Colloidal Synthesis and Characterisation of (a) Na0.5K0.5NbO3 Thin Films; and (b) Functionalised Gd2O3 Nanocrystals
2004 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

(a) Thin films of the perovskite structured Na0.5K0.5NbO3 (NKN) have been synthesised with several different sol-gel methods. Only one method gave pure NKN phase while the other methods gave extra peaks in the x-ray diffraction patterns, indicating that other, unidentified, phases were present. Scanning electron microscopy revealed grain sizes ranging from about 50 to 300 nm. The films prepared by chemical methods are compared with sputtered thin films.

(b) Nanocrystals of Gd2O3 have been prepared by various methods, using e.g. trioctylphosphine oxide (TOPO), diethylene glycol (DEG). The crystalline particles were of sizes 5 to 15 nm. Onto the surface of the particles, made with DEG, different carboxylic acids e.g. oleic acid or citric acid etc, were adsorbed. From IR measurements the bonding to the surface is recognised as chemisorbed via the carboxylate group in a bidentate or bridging fashion, with preference for the bridging coordination. The organic acid-particle complexes were characterised by XRPD, TEM, FTIR, Raman and XPS.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2004. 71 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1115
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-54128 (URN)LiU-TEK-LIC-2004:44 (Local ID)91-8529-531-0 (ISBN)LiU-TEK-LIC-2004:44 (Archive number)LiU-TEK-LIC-2004:44 (OAI)
Presentation
(English)
Opponent
Supervisors
Available from: 2010-02-25 Created: 2010-02-24 Last updated: 2013-11-14Bibliographically approved

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Kugler, Veronika MozhdehSöderlind, FredrikMusic, DenisHelmersson, Ulf

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Kugler, Veronika MozhdehSöderlind, FredrikMusic, DenisHelmersson, Ulf
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Journal of Crystal Growth
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