Rhombohedral superlattice structure and relaxor ferroelectric behavior of (Pb0.70Ba0.30) ZrO3 ceramics

Authors
Pokharel, BP Ranjan, R Pandey, D Siruguri, V Paranjpe, SK
Citation
Bp. Pokharel et al., Rhombohedral superlattice structure and relaxor ferroelectric behavior of (Pb0.70Ba0.30) ZrO3 ceramics, APPL PHYS L, 74(5), 1999, pp. 756-758
Citations number
20
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
00036951 → ACNP
Volume
74
Issue
5
Year of publication
1999
Pages
756 - 758
Database
ISI
SICI code
0003-6951(19990201)74:5<756:RSSARF>2.0.ZU;2-B
Abstract
Superlattice reflections observed in the neutron powder-diffraction pattern s of (Pb0.80Ba0.20)ZrO3 (PBZ20) and (Pb0.70Ba0.30)ZrO3 (PBZ30) are explaine d in terms of doubled rhombohedral cell (R3c). A Rietveld analysis of the n eutron data reveals that the displacements of Pb2+/Ba2+ and Zr4+ decrease w ith increasing Ba2+ content while the thermal parameter for Pb2+/Ba2+ incre ases and becomes similar to ferroelectric relaxors. Dielectric studies inde ed confirm relaxor behavior in PBZ30 with Vogel-Fulcher type relaxational f reezing. (C) 1999 American Institute of Physics. [S0003-6951(99)02705-9].