RAMAN-SPECTROSCOPIC STUDY OF PB5MOO8

Unpolarized Raman spectra of Pb5MoO8 were measured at room temperature in the range 20-1100 cm(-1) and are discussed in terms of two structu ral models, one based on electron diffraction data and the other on x- ray diffraction data, which differ in the proposed arrangements of Mo atoms, The validity of the two models was tested by comparing the expe rimental Raman spectrum of Pb5MoO8 with the calculated spectra for clu sters typical of the two models. It is shown that the experimental Ram an spectrum is fitted very well by Raman-active modes of the structura l units based on x-ray diffraction data, pointing to the correctness o f the x-ray diffraction model. (C) 1998 John Wiley & Sons, Ltd.