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Principles and Applications of Ferroelectrics and Related Materials$
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M. E. Lines and A. M. Glass

Print publication date: 2001

Print ISBN-13: 9780198507789

Published to Oxford Scholarship Online: February 2010

DOI: 10.1093/acprof:oso/9780198507789.001.0001

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Basic Concepts

Basic Concepts

Chapter:
(p.1) 1 Basic Concepts
Source:
Principles and Applications of Ferroelectrics and Related Materials
Author(s):

M. E. LINES

A. M. GLASS

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198507789.003.0001

This book looks at some concepts leading to a basic understanding of ferroelectricity. Depending on their geometry, crystals are commonly classified into seven systems: triclinic (the least symmetrical), monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic. These systems can again be subdivided into point groups (crystal classes) according to their symmetry with respect to a point. There are 32 such crystal classes and 11 of them possess a centre of symmetry. Twenty of the 21 non-centric crystal classes exhibit electrical polarity when subjected to stress. The effect (and also its converse, the production of strain by application of an electric field) is linear, with reversal of the stimulus resulting in a reversal of the response, and is termed the piezoelectric effect. Topics in this book include statistical theory, soft modes, phase transitions, macroscopics and phenomenology, thermodynamics, structural crystallography, order-disorder ferroelectrics, nonlinear optics, and applications of ferroelectrics.

Keywords:   ferroelectricity, crystals, piezoelectric effect, statistical theory, soft modes, phase transitions, thermodynamics, nonlinear optics, structural crystallography

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