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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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Magnetic And Optic Studies Of Local Environment

Magnetic And Optic Studies Of Local Environment

Chapter:
(p.408) 12 Magnetic And Optic Studies Of Local Environment
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/9780198507789.003.0012

This chapter discusses the various methods available for the measurement of local crystal symmetry and of local vibrational motion in ferroelectric systems. A basic disadvantage of many of these techniques is that they make use of properties of ions, such as paramagnetism and nuclear quadrupole moment, which are not possessed by the majority of ions which make up the more common ferroelectrics and antiferroelectrics. This implies a necessity of doping, which in turn can modify the local environment under study and lessen the ability to investigate properties of the nominally pure material. On the other hand, the methods also have advantages including great sensitivity and the ability to probe in detail the often very important roles played by impurities and defects in ferroelectrics. This chapter also considers basic concepts of nuclear magnetic resonance and some experimental findings, electron paramagnetic resonance, Mössbauer spectroscopy, optical spectroscopy, electronic band structure, impurity spectra, colour centres and polarons, stimulated emission, excited-state polarization, photovoltaic effects, and the photorefractive effect.

Keywords:   local environment, ferroelectrics, crystal symmetry, vibrational motion, nuclear magnetic resonance, electron paramagnetic resonance, optical spectroscopy, photovoltaic effects, excited-state polarization, polarons

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