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APS » Journals » Phys. Rev. B » Volume 65 » Issue 18
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Phys. Rev. B 65, 180301(R) (2002) [4 pages]

Optical phonons associated with the low-temperature ferroelectric properties of perovskite solid solutions

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A. M. George1, Jorge Íñiguez1,2, and L. Bellaiche1
1Physics Department, University of Arkansas, Fayetteville, Arkansas 72701
2Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019

Received 9 October 2001; published 19 April 2002

A simple way of analyzing the atomic displacements in perovskite alloys is used to determine the optical phonons contributing to their low-temperature ferroelectric properties. This determination (i) leads to the identification of three different kinds of solid solutions, (ii) reveals why simple theoretical models can be used in some alloys and not in others, and (iii) explains why unusual phase transitions can occur in ordered ferroelectric solid solutions.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.180301
DOI:
10.1103/PhysRevB.65.180301
PACS:
63.20.-e, 77.84.Dy, 77.80.Bh
 
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