Raman-spectroscopy study of the structure of niobium germanate glasses
Glasses of the system K/sub 2/O - Nb/sub 2/O/sub 5/ - GeO/sub 2/ were investigated across three sections. The coordination states of the Nb ion were studied as a function of the concentration of Nb/sub 2/O/sub 5/ and the K/sub 2/O - GeO/sub 2/ ratio in the glass. The structural role of niobium and the interaction between niobate and germanate structural units was examined. A model of the processes which occur with the addition of Nb/sub 2/O/sub 5/ to a glass of a potassium digermanate composition was developed. The emergence of bands characteristic of tetragonal and cubic modifications of KNbO/sub 3/ indicated that the excess (NbO/sub 6/)/sup 7 -/ octahedra and the K/sup +/ ions are deposited as a separate phase, i.e., the onset of processes which precede crystallization.
- Research Organization:
- Lensovet Leningrad Technological Institute (USSR)
- OSTI ID:
- 6317760
- Journal Information:
- Sov. J. Glass Phys. Chem.; (United States), Journal Name: Sov. J. Glass Phys. Chem.; (United States) Vol. 13:3; ISSN SJGCD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
CHALCOGENIDES
COORDINATION VALENCES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALLIZATION
CRYSTALS
CUBIC LATTICES
ENERGY LEVELS
EXCITED STATES
GERMANATES
GERMANIUM COMPOUNDS
GERMANIUM OXIDES
GLASS
IONIC CRYSTALS
LASER SPECTROSCOPY
NIOBATES
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
RAMAN SPECTRA
RAMAN SPECTROSCOPY
REFRACTORY METAL COMPOUNDS
SPECTRA
SPECTROSCOPY
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
VALENCE
VIBRATIONAL STATES