Molten salt synthesis of complex perovskite-related dielectric oxides

Authors
Thirumal, M Jain, P Ganguli, AK
Citation
M. Thirumal et al., Molten salt synthesis of complex perovskite-related dielectric oxides, MATER CH PH, 70(1), 2001, pp. 7-11
Citations number
15
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS CHEMISTRY AND PHYSICS
ISSN journal
02540584 → ACNP
Volume
70
Issue
1
Year of publication
2001
Pages
7 - 11
Database
ISI
SICI code
0254-0584(20010402)70:1<7:MSSOCP>2.0.ZU;2-Y
Abstract
Perovskite related dielectric oxides of the formula Ba(Zn1/3Nb2/3)O-3, Ba(M g1/3Nb2/3)O-3 and Ba(Zn1/3Ta2/3)O-3 have been synthesized by the NaCl-KCl m olten salt (flux) method at low temperatures of 900 degreesC for 3 or 6 h. Sintering at 1000 degreesC retained the cubic structure. Sintering at 1300 degreesC generated minor amount (similar to 10%) of Ba5Nb4O15 in addition t o the main cubic phase for the niobium compounds. The tantalum compounds, o n the other hand, decomposed to Ba0.5TaO3, retaining a minor amount of the original cubic phase. Scanning electron micrographs show large grain size ( upto 10 mum) in some of the samples obtained by the molten salt method. (C) 2001 Elsevier Science B.V. All rights reserved.