Structural investigation of sodium borate glasses and melts by Raman spectroscopy. II. Conversion between BO<sub>4</sub> and BO<sub>2</sub>O units at high temperature期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Structural investigation of sodium borate glasses and melts by Raman spectroscopy. II. Conversion between BO₄ and BO₂O units at high temperature

Authors:	Tetsuji Yano Noboru Kunimine Shuichi Shibata Masayuki Yamane

Affiliation:	Department of Chemistry and Materials Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan

Abstract:	Raman scattering spectra were recorded for pure boron oxide and sodium borate glasses and their melts at the temperature ranging from room temperature to 1200 °C to investigate the structural changes occurring in the melts. The amounts of short-range order structures (SRO), BO₂O⁻ and BO₃, were estimated from the high frequency bands at 1100-1600 cm⁻¹. The ratio of 4-fold coordinated boron oxide BO₄, N₄, at high temperature could be derived for the glass melts as a function of Na₂O concentration. In Na₂O ?20 mol% region, N₄ showed a slight decrease while the remarkable decrease of N₄ was found in the region of Na₂O ?25 mol% with increasing temperature. The enthalpy of the equilibrium reaction,

Keywords:	B140 S440 R110
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