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Structure and vibrational properties of tetragonal scheelite NaBi(MoO4)2

✍ Scribed by J. Hanuza; A. Haznar; M. Maczka; A. Pietraszko; A. Lemiec; J. H. van der Maas; E. T. G. Lutz

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
537 KB
Volume
28
Category
Article
ISSN
0377-0486

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✦ Synopsis

The structure of the tetragonal crystal was determined. The space group is with cell NaBi(MoO 4 ) 2 I4 6 = S 4 2 dimensions a = 5.267, c = 11.565 and Z = 2. The molybdenum atoms occupy two di †erent sites of symmetry.

A 4 6 The Na' and Bi3' cations are situated on two positions with di †erent occupancy factors and are short-range ordered. The IR and Raman polarized spectra are discussed on the basis of the factor group analysis and phonon calculations. The modiÐed Urey-Bradley force Ðeld and potential energy distribution were applied for three molecular models of local disorder. Polarization properties are explained and related to the crystal structure. 1997 ( John Wiley & Sons, Ltd.

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✍ M. Maczka πŸ“‚ Article πŸ“… 1999 πŸ› John Wiley and Sons 🌐 English βš– 185 KB πŸ‘ 2 views

Raman and IR studies of a single orthorhombic crystal and of polycrystalline trigonal RbIn(MoO 4 ) 2 were performed at ambient temperature. The observed vibrational modes were assigned to the respective motions of atoms in the unit cells. It was shown that the first-order D 3d 3 β†’ D 2h 16 phase tran