Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898048 | Journal of the European Ceramic Society | 2018 | 27 Pages |
Abstract
Sm1-xTbxPO4 solid solutions were synthesized and extensively characterized by powder X-ray diffraction, vibrational spectroscopy, and X-ray absorption spectroscopy. At ambient conditions solid solutions up to xâ¯=â¯0.75 crystallize in the monazite structure, whereas TbPO4 is isostructural to xenotime. For xâ¯=â¯0.8 a mixture of both polymorphs was obtained. Moreover, a phase with anhydrite structure was observed coexisting with xenotime, which was formed due to mechanical stress. Selected solid solutions were investigated at pressures up to â¼40â¯GPa using in situ high pressure synchrotron X-ray diffraction and in situ high pressure Raman spectroscopy. SmPO4 and Sm0.5Tb0.5PO4 monazites are (meta)stable up to the highest pressures studied here. TbPO4 xenotime was found to transform into the monazite structure at a pressure of about 10â¯GPa. The transformation of Sm0.2Tb0.8PO4 xenotime into the monazite polymorph commences already at about 3â¯GPa. This study describes the reversibility of the pressure-induced (Sm,Tb)PO4 xenotime-monazite transformation.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
J.M. Heuser, R.I. Palomares, J.D. Bauer, M.J. Lozano Rodriguez, J. Cooper, M. Lang, A.C. Scheinost, H. Schlenz, B. Winkler, D. Bosbach, S. Neumeier, G. Deissmann,