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Principles and Applications of Ferroelectrics and Related Materials$
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Principles and Applications of Ferroelectrics and Related Materials

M. E. Lines and A. M. Glass

Print publication date: 2001

Print ISBN-13: 9780198507789

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198507789.001.0001

Order-Disorder Ferroelectrics

Chapter:
(p. 293 ) 9 Order-Disorder Ferroelectrics
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/9780198507789.003.0009

Ionic motion in a double-well local potential can be cast theoretically in the language of cooperative magnetism. In this modern approach, the potential minima referred to are with respect to a generalized displacement co-ordinate describing the motion of all ions in a unit cell. The more traditional approach for potassium dihydrogen phosphate (KH2PO4 or KDP) and its isomorphs has been to concentrate on the specific motion of the hydrogens (which is of largest amplitude) and to include the motion of the other ions, if at all, in terms of a specific coupling mechanism. Thus, for example, any tunnelling characteristics in the more generalized scheme involve all the atoms, whereas the tunnelling character in the more traditional approach is specifically reserved for the hydrogens. This chapter deals with order-disorder ferroelectrics, theory and experiment regarding KDP-type ferroelectrics, other KDP ferroelectric isomorphs, (NH)H2PO as a KDP-type antiferroelectric, triglycine sulphate and sodium nitrite.

Keywords:   order-disorder ferroelectrics, potassium dihydrogen phosphate, triglycine sulphate, sodium nitrite, antiferroelectricity, hydrogens, ionic motion

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