LETTERS
Local structure around Ge in lithium germanate glasses analyzed by AXS and EXAFS techniques
2015 年 110 巻 2 号 p. 60-64
詳細
2015 年 110 巻 2 号 p. 60-64
The local structure around Ge in xLi2O–(1 － x)GeO2 (x = 0, 0.17, 0.20, 0.24) glasses was investigated using AXS and EXAFS measurements. The averaged coordination number of the first nearest Ge–O pair increased with increasing Li2O content up to 24 mol% and the amount of six–coordinated Ge was proportional to Li2O content. The introduction of a GeO6 unit is suggested to be one of the most fundamental structural changes accompanying the so–called germanate anomaly detected in density measurements of alkali–germanate glasses.
