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Pressure-induced transformation processes in ferroelastic Pb3(P1–x As x O4)2, x = 0 and 0.80 by Boriana Mihailova; Ross J. Angel; Naemi Waeselmann; Bernd J. Maier; Carsten Paulmann; Ulrich Bismayer is a Chemistry article available to read on EtoBox.

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Abstract The high-pressure behaviour of two representative palmierite-type Pb3(P x As1–x O4)2 ferroelastic compounds with x = 0 and 0.80 was analyzed by combined single-crystal X-ray diffraction and Raman spectroscopy. Single-crystal diffraction measurements on the As-rich compound Pb3(P0.20As0.80O4)2 show that it undergoes the same macroscopic monoclinic to trigonal phase transition as previously observed in pure Pb3(PO4)2 but with a significantly lower transition pressure, p c = 0.90(4) GPa for x = 0.80 as opposed to p c = 1.81(1) for x = 0.0. Synchrotron X-ray diffraction experiments reveal that both compounds exhibit significant diffuse scattering in a pressure interval of ~1.5 GPa above the corresponding pressure-induced transitions, indicating the persistence of monoclinic nanodomains within the macroscopically trigonal phase above the phase-transition point, similar to the high-temperature structural state. Raman spectroscopy reveal quite distinct lattice dynamics for x = 0 and x = 0.80, indicating different pathways of pressure-driven structural alteration. The pure phosphate compound shows a displacive phase transition of thermodynamically second-order type, whereas the As

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Author

Boriana Mihailova; Ross J. Angel; Naemi Waeselmann; Bernd J. Maier; Carsten Paulmann; Ulrich Bismayer

Publisher

Walter de Gruyter GmbH

Published

2015

Language

EN

Field

Chemistry (Physical Sciences)