Member, American Ceramic Society.
Extended X-ray Absorption Fine Structure (EXAFS) Study on the local Environment around Copper in Low Thermal Expansion Copper Aluminosilicate Glasses
Article first published online: 11 JUL 2005
Journal of the American Ceramic Society
Volume 75, Issue 2, pages 477–478, February 1992
How to Cite
Kamiya, K., Okasaka, K., Wada, M., Nasu, H. and Yoko, T. (1992), Extended X-ray Absorption Fine Structure (EXAFS) Study on the local Environment around Copper in Low Thermal Expansion Copper Aluminosilicate Glasses. Journal of the American Ceramic Society, 75: 477–478. doi: 10.1111/j.1151-2916.1992.tb08205.x
R. R. Tummala—contributing editor
- Issue published online: 11 JUL 2005
- Article first published online: 11 JUL 2005
- Manuscript No. 196570. Received July 8, 1991; approved October 18, 1991.
- thermal expansion;
The local environment around copper in the Cu2O·Al2O3·4SiO3 and CuO·Al2O3·4SiO2 glasses was investigated using the extended X-ray absorption fine structure (EXAFS) technique. It has been found that each Cu(I) in the former glass is coordinated to two oxygens through covalent Cu(I)-O bonds. This is the primary reason for its low thermal expansion coefficient (∼10 × 10−7 K−1). In the latter glass, which was made by heating the former glass at 600°C in air, each Cu(II) is coordinated to four oxygens and the bonds are ionic in character, contributing to the increase in the thermal expansion coefficient to ∼30 × 10−7 K−1.