In situ transmission electron microscopy study of the paraelectric to ferroelectric (cubic to tetragonal) phase transformation in lanthanum-modified lead titanate ceramics-Reference-Cited by-同舟云学术

In situ transmission electron microscopy study of the paraelectric to ferroelectric (cubic to tetragonal) phase transformation in lanthanum-modified lead titanate ceramics

Published:1987-08 Issue: Volume:45 Page:172-173
ISSN:0424-8201
Container-title:Proceedings, annual meeting, Electron Microscopy Society of America
language:en
Short-container-title:Proc. annu. meet. Electron Microsc. Soc. Am.

Author:

Demczyk B. G.

Abstract

Lead titanate (PbTiO3) forms the ferroelectric end of the ferroelectric-antiferroelectric solid solution series PbTiO3-PbZrO3 (PZT), which is of considerable interest in various piezoelectric applications. Above the Curie point (TC), the material is cubic (paraelectric), point group m3m. Below this temperature transformation occurs to the tetragonal (ferroelectric) phase, point group 4mm. The strain generated in this transformation is relieved via the formation of twin-related structural (ferroelectric) domains. Lanthanum is added to polycrystalline lead titanate to aid in the poling operation (alignment of electric dipoles in individual grains via the application of a large electric field), through a reduction of the c/a ratio in the tetragonal phase. This transformation has been observed in this material in-situ via transmission electron microscopy (TEM).

Publisher

Cambridge University Press (CUP)

Subject

General Medicine

Reference8 articles.

1. Demczyk, B. G. and Thomas, G. , submitted to J. Am. Ceram. Soc.

2. Theory and mechanism for martensitic transformations in pervoskite ferroelectrics

3. Martensitic Transformation in La1-xSrxCoO3

4. The author gratefully acknowledges the sponsorship of Prof. Gareth Thomas, Dept, of Mat. Sci. and Min. Eng, University of California, Berkeley. Samples were provided by Prof. K. Okazaki, Department of Electrical Eng., the National Defense Academy, Yokosuka 239, Japan. Experimental work was funded by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Science Division, U.S. Dept, of Energy (contract DE-AC03-76F00098).

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1. Ferroelectric Domain Structure of Lanthanum-Modified Lead Titanate Ceramics;Journal of the American Ceramic Society;1990-03