SYNTHESIS AND POLARIZED RAMAN STUDIES OF RHOMBOHEDRAL LUOCL SINGLE-CRYSTALS

The polarized Raman spectra of SmSI-type rhombohedral LuOCl were recor ded at various polarization orientations. The polarized spectra were a nalyzed to determine the symmetry assignments of the Raman-active tran sitions. The Raman spectra of polycrystalline and single-crystal LuOCl are characterized by five features. Analysis of the intensity enhance ments of the three lattice vibrations at 139, 272 and 496 cm(-1) indic ate an E(g) symmetry, whereas those at 86, 139 and 473 cm(-1) exhibit intensity enhancements which indicate an A(1g) symmetry.