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High Resolution Neutron Powder Diffraction Studies of the Ferroelastic Phase Transition in LaNbO4

Published online by Cambridge University Press:  21 February 2011

W I F David
W I F David*
Affiliation:
Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OXl 1 OQX, UK
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Abstract

Analysis of high resolution neutron powder diffraction data of ferroelastic LaNbO4 indicates a monoclinic to tetragonal structural phase transition that is accompanied by anomalous line broadening. The origins of this line broadening have been investigated using a novel modification of the Rietveld technique. The results show that strain broadening is associated with the ferroelastic phase transition both above and below the transition temperature. This anomalous ‘microstrain’ is well-described by a second rank strain tensor, the principal axes of which are collinear with the spontaneous lattice strain. This phenomenon may be a general feature of proper ferroelastic phase transitions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 203
Copyright
Copyright © Materials Research Society 1990

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References

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