Raman spectrometric studies of selected lanthanide tribromides and trichlorides

Technical Report · Tue Mar 01 04:00:00 EST 1988

OSTI ID:5129939

Daniel, J F

Laser Raman spectroscopy was used to identify the crystal structures of lanthanide and actinide compounds. The phonon Raman spectrum is characteristic of the particular crystal structure. GdCl/sub 3/ exhibits two crystal structures, the UCl/sub 3/-type hexagonal and the PuBr/sub 3/-type orthorhombic. In the literature it is reported that the low temperature form is orthorhombic; results of experiments here suggest that it is hexagonal. Interconversion between these two forms can be accomplished with temperature andor pressure. In the present work laser Raman spectrometry was used to monitor crystal structure changes in GdCl/sub 3/ as a function of temperature or pressure to determine the temperature or pressure at which the hexagonal-to-orthorhombic transformation occurs. Raman spectroscopy was also used to determine the symmetry assignments for the Raman-active bands of a single crystal. Raman spectra of polycrystalline NdBr/sub 3/ have been recorded at room temperature and pressure and at approximately 100/degree/K. In addition, polarized Raman spectra of a single crystal NdBr/sub 3/ have been measured. Based on these polarization measurements, symmetry assignments of eight Raman-active modes were made. These assignments are useful in interpreting the phonon Raman spectrum of any compound exhibiting the PuBr/sub 3/-type orthorhombic structure. 24 figs., 5 tabs.

• Research Organization: Tennessee Univ., Knoxville (USA)
• DOE Contract Number: AS05-76ER04447; AC05-84OR21400
• OSTI ID: 5129939
• Report Number(s): DOE/ER/04447-237; ON: DE88008235
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
BROMIDES
BROMINE COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL STRUCTURE
CRYSTALS
GADOLINIUM CHLORIDES
GADOLINIUM COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
LANTHANUM BROMIDES
LANTHANUM CHLORIDES
LANTHANUM COMPOUNDS
LASER SPECTROSCOPY
NEODYMIUM BROMIDES
NEODYMIUM COMPOUNDS
PHONONS
POLARIZATION
POLYCRYSTALS
PRESSURE EFFECTS
QUASI PARTICLES
RAMAN SPECTRA
RAMAN SPECTROSCOPY
RARE EARTH COMPOUNDS
SPECTRA
SPECTROSCOPY
TEMPERATURE EFFECTS