Structure and vibrational properties of tetragonal scheelite NaBi(MoO4)2
1997; Wiley; Volume: 28; Issue: 12 Linguagem: Inglês
10.1002/(sici)1097-4555(199712)28
ISSN1097-4555
AutoresJ. Hanuza, A. Haznar, Mirosław Mączka, A. Pietraszko, A. Lemiec, J.H. van der Maas, E.T.G. Lutz,
Tópico(s)Luminescence Properties of Advanced Materials
ResumoThe structure of the tetragonal NaBi(MoO4)2 crystal was determined. The space group is I4=S42 with cell dimensions a=5.267, c=11.565 Å and Z=2. The molybdenum atoms occupy two different sites of 4 symmetry. The Na+ and Bi3+ cations are situated on two positions with different 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 modified Urey–Bradley force field 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.
Referência(s)