Nanocrystalline ferroelectric phases from mechanical activation of oxide compositions

Citation
J. Lim et al., Nanocrystalline ferroelectric phases from mechanical activation of oxide compositions, SCR MATER, 44(8-9), 2001, pp. 1803-1806
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
SCRIPTA MATERIALIA
ISSN journal
1359-6462 → ACNP
Volume
44
Issue
8-9
Year of publication
2001
Pages
1803 - 1806
Database
ISI
SICI code
1359-6462(20010518)44:8-9<1803:NFPFMA>2.0.ZU;2-6
Abstract
Successful synthesis of nanocrystalline perovskite lead scandium tantalate, PbSc0.5Ta0.5O3, was achieved via a novel one-step mechanical activation ro ute. The as-formed PST exhibits a disordered structure and nanocrystalline domains of similar to 8nm. Sintered ceramics made from these powders retain long-range disordered perovskite structure up to 1200 degreesC and a diele ctric constant of similar to 23,000 is obtained. Sintering above this tempe rature results in the formation of undesirable pyrochlore phases that degra des dielectric properties. (C) 2001 Acta Materialia Inc. Published by Elsev ier Science Ltd. All rights reserved.