RAMAN SPECTRA OF MONOCLINIC NEODYMIUM-ALUMINUM BORATE

The Raman spectra of monoclinic NdAL₃(BO₃)₄(NAB) have been recorded and interpreted. A factor group analysis of the NAB space group shows that there are 25A_g and 26B_g Raman-active modes, and 34A_u and 35B_u IR-active modes. A discussion of the assignment of the individual Raman lines was given. The predicted factor group splittings for the internal modes of BO₃ anion were observed and interpreted.