Structural characterization of Lu{sub 1.8}Y{sub 0.2}SiO{sub 5} crystals
- Dipartimento di Fisica, Universita di Cagliari, Cittadella Universitaria, S.P. No. 8, I-09042 Monserrato (Italy)
The structural and vibrational properties of Lu{sub 1.8}Y{sub 0.2}SiO{sub 5} (LYSO) single crystals were investigated by means of Raman spectroscopy and x-ray diffraction measurements. Unit cell parameters and bond lengths were determined by Rietveld refinement of the collected x-ray diffraction powder spectra. By comparison with the vibrational spectra of the parent compounds Lu{sub 2}SiO{sub 5} and Y{sub 2}SiO{sub 5} and by using polarized Raman measurements, we propose the assignment of the principal vibrational modes of LYSO crystals. The strict connection of Raman spectra of the LYSO solid solution and of the pure lutetium and yttrium crystals, as well as the analysis of the polarized measurements, confirms that LYSO structure adopts the C2/c space group symmetry. The structural analogies of LYSO with the pure compound Lu{sub 2}SiO{sub 5} are further shown by means of high pressure Raman spectroscopy, and the possibility of considering the LYSO crystal analogous to the LSO structure with a tensile stress between 0.25 and 0.80 GPa is discussed.
- OSTI ID:
- 21055097
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 76, Issue 5; Other Information: DOI: 10.1103/PhysRevB.76.054112; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BOND LENGTHS
COMPARATIVE EVALUATIONS
LUTETIUM
LUTETIUM COMPOUNDS
MONOCLINIC LATTICES
MONOCRYSTALS
POWDERS
PRESSURE RANGE GIGA PA
PRESSURE RANGE MEGA PA 10-100
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SOLID SOLUTIONS
SPACE GROUPS
STRESSES
SYMMETRY
X-RAY DIFFRACTION
YTTRIUM
YTTRIUM SILICATES