Polymorphism in PbBiOXO{sub 4} compounds (X=V, P, As). Part I: Crystal structures of {alpha}- and {beta}-PbBiOVO{sub 4}
- Unite de Catalyse et de Chimie du Solide, CNRS UMR 8181 (Equipe de Chimie du Solide), ENSCL, USTL, 59655 VILLENEUVE D'ASCQ Cedex (France)
- Laboratoire Leon Brillouin (LLB), CEA-CNRS UMR 12, CEA, Saclay, F 91191 Gif/Yvette (France)
Reinvestigation of PbBiOVO{sub 4} thermal behaviour revealed a phase transition. As shown by single-crystal X-ray diffraction and high-resolution neutron powder diffraction, {alpha}-PbBiOVO{sub 4} transforms to {beta}-PbBiOVO{sub 4} at 550 deg. C. At 25 deg. C, {alpha}-PbBiOVO{sub 4} is triclinic, S.G. P-1, Z=2, with a=5.6088(3), b=7.1109(3), c=7.2978(3) A, {alpha}=108.957(2), {beta}=111.889(2), and {gamma}=94.833(2){sup o}. Above 550 deg. C, {beta}-PbBiOVO{sub 4} is monoclinic, S.G. C2/m, Z=4, with a=13.61(1), b=5.64(1), c=7.18(1) A, and {beta}=113.75(1){sup o}. Both structures are built upon (O{sub 2}Bi{sub 2}Pb{sub 2}){sub {infinity}} chains parallel to the [100] direction in the {alpha} polymorph and [001] in the {beta}-polymorph. These chains are undulated in {alpha} and linear in {beta}. In both structures, VO{sub 4} tetrahedra are organized in two sets of rows parallel to (O{sub 2}Bi{sub 2}Pb{sub 2}){sub {infinity}} chains, thus building layers of (OBiPb) sandwiched by two layers of VO{sub 4} oriented head to tail; VO{sub 4} displays different orientations in {alpha}- and {beta}-PbBiOVO{sub 4}. - Graphical abstract: PbBiOVO{sub 4} polymorphism.
- OSTI ID:
- 21128440
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 9; Other Information: DOI: 10.1016/j.jssc.2008.05.026; PII: S0022-4596(08)00256-9; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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