矿物和玻璃中MgK-边X射线吸收光谱研究  

Study of the XAS of Mg K edge in Some Minerals and Glasses

作　　者：彭明生[1] 李迪恩[1] 

机构地区：[1]中山大学宝石矿物材料研究所,广州510275

出　　处：《矿物岩石地球化学通报》1999年第4期254-256,共3页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金

摘　　要：The coordination of Mg in spinel, diopside and pyrope is 4,6 and 8,respectively. The spectral profiles of these minerals are different, and the Mg K edge shifts towards higher energy with increase in the coordination number of Mg. The former may be related to the coordination geometry, and the latter to the Mg—O band distance. Mg K edge(peak 1) tends to shift to higher energy with the increase in Mg-O band distance, but also to shift to lower energy with increase in the band valence of Mg with oxygen. Mg in CaMgSi 2O 6(Di) NaAlSi 3O 8(Ab)glasses may be multiple structural sites.The coordination of Mg in spinel, diopside and pyrope is 4,6 and 8,respectively. The spectral profiles of these minerals are different, and the Mg K edge shifts towards higher energy with increase in the coordination number of Mg. The former may be related to the coordination geometry, and the latter to the Mg—O band distance. Mg K edge(peak 1) tends to shift to higher energy with the increase in Mg-O band distance, but also to shift to lower energy with increase in the band valence of Mg with oxygen. Mg in CaMgSi 2O 6(Di) NaAlSi 3O 8(Ab)glasses may be multiple structural sites.

关 键 词：含镁矿物和玻璃 同步辐射 X射线吸收光谱 MgK-边 XANES 

分 类 号：P575[天文地球—矿物学]