Počet záznamů: 1
Fundamental Issues in the Synthesis of Ferroelectric Na0.5K0.5NbO3 Thin Films by Sol-Gel Processing
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SYSNO ASEP 0357037 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Fundamental Issues in the Synthesis of Ferroelectric Na0.5K0.5NbO3 Thin Films by Sol-Gel Processing Tvůrce(i) Chowdhury, A. (GB)
Bould, Jonathan (UACH-T) SAI, RID, ORCID
Londesborough, Michael Geoffrey Stephen (UACH-T) SAI, RID, ORCID
Milne, S.J. (GB)Zdroj.dok. Chemistry of Materials. - : American Chemical Society - ISSN 0897-4756
Roč. 22, č. 13 (2010), s. 3862-3874Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova sodium-potassium niobate ; pulsed-laser deposition ; lead-free piezoceramics Vědní obor RIV CA - Anorganická chemie CEZ AV0Z40320502 - UACH-T (2005-2011) UT WOS 000279389200009 DOI 10.1021/cm903697j Anotace In contrast to films fabricated by physical vapor deposition methods, thin films of Na0.5K0.5NbO3 (NKN) made by metal alkoxide sal gel routes generally fail to exhibit polarization-electric field responses typical of a ferroelectric. This study sets out to investigate the reasons for the problems in producing sol gel NKN films by examining the thermochemistry of the gel to ceramic conversion. The NKN precursor gels displayed multiple heating DTA crystallization exotherms in the temperature range 480-550 degrees C, which are attributed to compositional segregation of NKN components. At higher temperatures, 800-850 degrees C, a heating DTA endotherm and cooling DTA exotherm are indicative of melting and recrystallization of sodium/potassium carbonate secondary phases. Additionally, repeated thermal analyses, after storage of the gel decomposition product under ambient conditions, revealed a tendency for hydration and carbonation on exposure to air. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2011
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