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Ferroelastic orientation states and domain walls in lead phosphate type crystals

¹ Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany
² Institut für Mineralogie, Universität Münster, Corrensstr. 24, 48149, Münster, Germany
³ EMAT, University of Antwerp RUCA, Groenenborgerlaan 171, Antwerp, Belgium
⁴ Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK

^* E-mail: ubis{at}mineralogie.uni-hamburg.de

The monoclinic structural distortion in lead phosphate and lead arsenate is correlated with the ferroelastic phase transition Rm C2/c and Rm 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 highly 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-arsenate, atomic force microscopy, ferroelastic domains

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