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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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Structural Crystallography and Phase Transitions

Structural Crystallography and Phase Transitions

(p.174) 6 Structural Crystallography and Phase Transitions
Principles and Applications of Ferroelectrics and Related Materials



Oxford University Press

This chapter discusses structural crystallography and phase transitions. If all atoms in a crystal were exactly at their official lattice sites and there were no order-disorder ambiguity as to the position of these sites, then all the measurable physical quantities associated with the crystal would be exactly periodic functions reflecting the symmetry of the unit cell. The use of X-ray diffraction (XRD) in determining a crystal's static structure is explored, along with the general theory of XRD, structural classification for ferroelectrics, elastic neutron scattering and the problems of structure refinement, diffuse X-ray scattering and static displacement correlations, inelastic neutron scattering and dynamic crystallography, KTa1-xNbxO3 and dynamics in perovskite soft modes, and dynamics in hydrogen bonds of KD2PO4.

Keywords:   structural crystallography, phase transitions, X-ray diffraction, crystal structure, elastic neutron scattering, inelastic neutron scattering, perovskite, soft modes, hydrogen bonding

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