Order-disorder phase transition in Ba(Zn1/3Ta2/3)O-3

Authors
Qazi, I Reaney, IM Lee, WE
Citation
I. Qazi et al., Order-disorder phase transition in Ba(Zn1/3Ta2/3)O-3, J EUR CERAM, 21(15), 2001, pp. 2613-2616
Citations number
6
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN journal
09552219 → ACNP
Volume
21
Issue
15
Year of publication
2001
Pages
2613 - 2616
Database
ISI
SICI code
0955-2219(2001)21:15<2613:OPTIB>2.0.ZU;2-9
Abstract
The order-disorder transition temperature in Ba(Zn1/3Ta23)O-3 ceramics has been investigated using X-ray diffraction (XRD) and transmission electron m icroscopy (TEM). Samples were quenched into water after annealing at differ ent temperatures ranging from 1550 to 1625 degreesC/15 h. XRD showed maximu m ordering for samples annealed and quenched from 1600 degreesC accompanied by an order of magnitude increase in the size of ordered domains from that observed in as-sintered samples (20 nm). Although XRD revealed complete di sorder for samples quenched from 1625 degreesC, (110) zone axis electron di ffraction patterns revealed the presence of short range 1:1 and 1:2 orderin g. XRD indicated that samples furnace cooled from 1625 degreesC were also d isordered but could be re-ordered by annealing at 1500 degrees C. (C) 2001 Published by Elsevier Science Ltd. All rights reserved.