XAFS study on Ca local structure in natural glasses and tektite
XAFS study on Ca local structure in natural glasses and tektite
复制标题
XAFS 研究天然玻璃和玻璃陨石中 Ca 局部结构
DOI：
10.1088/1742-6596/430/1/012070
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Y. Hayasaka and H. Isobe
中科院分区：
文献类型：
--
作者：
T. Tobase;L. Wang;A. Yoshiasa;M. Okube;T. Nakatani;Y. Hayasaka and H. Isobe
利用Ca K边X射线吸收近边结构（XANES）和扩展X射线吸收精细结构（EXAFS）研究了玻璃陨石和天然玻璃的局域结构，为玻璃的键距和配位数提供定量数据。玻璃陨石的边缘前峰强度为10.7- 11.7%，假玄武玻璃、Kirauuea火山玻璃、撞击岩、沥青岩和火山岩的边缘前峰强度为6.7- 10.9%。玻璃陨石的主峰肩峰强度为68.3- 70.7%，其它天然玻璃的主峰肩峰强度为63.0- 63.9%。XAFS分析表明，玻璃陨石中Ca的配位数均为7位，而天然玻璃中Ca的配位数为6位、7位和8位。研究表明，不同成因的天然玻璃具有不同的钙局部结构。
The local structures of tektite and natural glasses were studied by Ca K-edge X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) in order to provide quantitative data on bonding distances and coordination numbers. The pre-edge peak intensities of tektites are 10.7-11.7%, and those of peudotachylite, Kirauea volcanic glass, impactite, pitchstone and perlite are 6.7–10.9%. The main peak shoulder intensities of tektites are 68.3–70.7%, and other natural glasses are 63.0–63.9%. XAFS analysis indicated all tektites possess 7-coordinated Ca, but natural glasses possess 6-, 7-and 8-coordinated Ca. This study indicated that different petrogenesis of natural glasses gives different local structures of calcium.