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Lead Stereochemistry in Incommensurate Ferroelectric Perovskites and in Incommensurate Lead Monoxide

Published online by Cambridge University Press:  01 February 2011

Gianguido Baldinozzi ,
Jean-Marc Raulot  and
Ram Seshadri
Gianguido Baldinozzi
Affiliation:
SPMS, CNRS Ecole Centrale Paris, 92295 Chatenay-Malabry, France
Jean-Marc Raulot
Affiliation:
SPMS, CNRS Ecole Centrale Paris, 92295 Chatenay-Malabry, France
Ram Seshadri
Affiliation:
SSSCU, Indian Institute of Science, Bangalore, India
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Abstract

We have performed Rietveld refinements on neutron and synchrotron diffraction patterns and density functional calculations on various ferroelectric lead perovskites and on α lead monoxide (litharge). These structural data have allowed to shed some light on lead stereochemistry in these compounds. In particular, we discuss the changing in the lead behaviour between the paraelectric cubic phases and the low temperature anti or ferroelectric phases in Pb2CoWO6 and Pb2MgTeO6 (both incommensurate), in Pb2MgWO6 (antiferroelectric) and in PbMg1/3Nb2/3O3 (relaxor). The possible phase transition mechanisms are reviewed and the bonds are compared to those in the aperiodic structure of α-lead monoxide.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 718: Symposium D – Perovskite Materials , 2002 , D12.7
Copyright
Copyright © Materials Research Society 2002

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