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Ferroelastic orientation states and domain walls in lead phosphate type crystals

Published online by Cambridge University Press:  05 July 2018

U. Bismayer ,
D. Mathes ,
D. Bosbach ,
A. Putnis ,
G. van Tendeloo ,
J. Novak  and
E. K. H. Salje
U. Bismayer*
Affiliation:
Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany
D. Mathes
Affiliation:
Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany
D. Bosbach
Affiliation:
Institut für Mineralogie, Universität Münster, Corrensstr. 24, 48149, Münster, Germany
A. Putnis
Affiliation:
Institut für Mineralogie, Universität Münster, Corrensstr. 24, 48149, Münster, Germany
G. van Tendeloo
Affiliation:
EMAT, University of Antwerp RUCA, Groenenborgerlaan 171, Antwerp, Belgium
J. Novak
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
E. K. H. Salje
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
*
*E-mail: ubis@mineralogie.uni-hamburg.de
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Abstract

The monoclinic structural distortion in lead phosphate and lead arsenate is correlated with the ferroelastic phase transition R3̄m → C2/c and R3̄m → P21/c respectively. The resulting domain patterns in the mixed compounds depend on their chemical composition. The intersection of ferroelastic W domain walls with the (100) surface of lead phosphate-arsenate mixed crystals has been imaged using tapping mode atomic force microscopy. Dilution of the strain leads to characteristic surface deformations which deviate from those in pure lead phosphate. In high twinned lead phosphate-arsenate, X-ray diffraction (XRD) was used to show renormalization effects and scattering phenomena stemming from the twin walls. The wall trajectory was found to be independent of chemical variations using transmission electron microscopy.

Keywords

lead phosphate-arsenateatomic force microscopyferroelastic domains
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 2 , April 2000 , pp. 233 - 239
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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