Structure of mixed alkali/alkaline-earth silicate glasses from neutron diffraction and vibrational spectroscopy
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Goeteborg (Sweden)
- Institute fuer Physikalische Chemie and Sonderforschungsberiech 458, Westfaelische Wilhelms-Universitaet Muenster, Corrensstrasse 30, 48149 Muenster (Germany)
- ISIS Facility, CLRC Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom)
The structures of mixed alkali/alkaline-earth silicate glasses containing Na, Ca, and Sr [xNa{sub 2}O-(3-x)CaO-4SiO{sub 2} with x=0, 0.4, 1.0, 1.5, and Na{sub 2}O-yCaO-(2-y)SrO-4SiO{sub 2} with y=0, 1, 2] were investigated in order to understand the ion conduction properties, particularly the dependencies of cation activation energies on composition. Neutron diffraction, reverse Monte Carlo (RMC) modeling, and vibrational spectroscopy (Raman and specular reflection infrared spectroscopy) techniques were employed. The results show that the cations are dispersed within the Si-O network, which consists of SiO{sub 4} tetrahedrons that are mainly Q{sup 2} and Q{sup 3}. The local environments of Na and Ca are quite similar, but different from that of Sr. The structural results suggest that the replacement of Ca by Na in the Na-Ca series of glasses opens up the structure and allows the formation of diffusion pathways, thus enhancing the diffusion of both Na and Ca, since Ca cations may make use of empty Na sites.
- OSTI ID:
- 20719311
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 72, Issue 6; Other Information: DOI: 10.1103/PhysRevB.72.064206; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
Similar Records
Raman study of potassium silicate glasses containing Rb[sup +], Sr[sup 2+], Y[sup 3+], and Zr[sup 4+]: Implications for cation solution mechanisms in multicomponent silicate liquids
Investigation of the phase equilibria and phase transformations associated with the Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub y] superconductor
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
ACTIVATION ENERGY
CALCIUM OXIDES
CATIONS
COMPUTERIZED SIMULATION
DIFFUSION
GLASS
INFRARED SPECTRA
IONIC CONDUCTIVITY
MONTE CARLO METHOD
NEUTRON DIFFRACTION
RAMAN SPECTRA
REFLECTION
SILICATES
SODIUM OXIDES
STRONTIUM OXIDES