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New Phase Transitions in Perovskite Oxides: BiFeO3, SrSnO3, and Pb(Fe2/3W1/3)1/2Ti1/2O3

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Abstract:

This paper reports on two new aspects of oxide perovskites: the first part is devoted to new phase transitions, especially at high temperatures; multiferroics such as BiFeO3 and Pb–Fe–W–titanate are emphasized but nonmagnetic materials such as SrSnO3 are included. The work summarized on bismuth ferrite emphasizes its metal–insulator transition near 1200 K (atmospheric pressure) and 47 GPa (room temperature); that on SrSnO3 emphasizes order–disorder phase transitions; and that on lead–iron tungstate–titanate exhibits a classic second-order ferroelectric phase transition, of which rather few are known in the literature. The second part of the paper presents a discussion of constant phase elements for oxide perovskite ceramics; this is a modern way of characterizing their dielectric relaxation, particularly near phase transition temperatures.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2008.02404.x

Affiliations: 1: Earth Sciences Department, University of Cambridge, Cambridge CB2 3EQ, U.K. 2: Department of Physics, University of Puerto Rico, San Juan, Puerto Rico 00931-3343

Publication date: June 1, 2008

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