黝锡矿的^(119)Sn和^(57)Fe穆斯堡尔谱研究

Studies on ^(119)Sn and ^(57)Fe Mossbauer Spectra of Stannite

本文收集了我国南方4个产地的黝锡矿样品,使用电子探针、X射线衍射、^(119)Sn、^(57)Fe穆斯堡尔谱等测试方法测试。X射线衍射结果,黝锡矿的晶胞参数为:a=5.4531(5)?,c=10.7470(7)?,四方晶系,空间群I42m。4个不同产地的黝锡矿的Sn、Fe穆斯堡尔谱测量表明:锡的I·S值为1.34—1.49mm/s,Q·S值为0.36—0.50mm/s,为四面体的Sn^(4+);铁的I·S值为0.588—0.596mm/s,Q·S值为2.900—2.911mm/s,为四面体的Fe^(2+)。Sn、Fe离子仅占据一种结晶学位置。这些黝锡矿富Zn,Zn以类质同象置换Fe。

Stannite is a sulfide mineral with complex structure, belonging to theCu-Sn--Fe-S system. Stannite samples were collected from four places in -South China. Electron microprobe analysis was performed for its chemicalcomposition. X-ray diffraction analyses show that its unit cell parametersare a= 5.4531 (5) A and c= 10.7470 (7) A, belonging to tetragonal system withspace group 142m. Mossbauer parameters of Sn and Fe in stannite from fourdifferent localities indicate that IS values and QS values are respectively1.34--1.49 mm/s and 0.36--0.50 mm/s for Sn, suggesting Sn^4+ of tetrahedra,and are respectively 0.588--0.596 mm/s and 2.900--2.911 mm/s for Fe,suggesting Fe^2+ of tetrahedra. Sn, Fe cations only occupy one sort of crystal-lographic sites. Stannite from these places are enriched in Zn, which existsin the form of isomorphous replacement of Fe.