钛钡铬石、钛钾铬石的穆斯堡尔谱研究及晶体化学  

MSSBAUER SPECTROSCOPY AND CRYSTALLOCHEMISTRY OF LINDSLEYITE-METHIASITE

作　　者：江嘉济 张建洪[1] 马建国[1] 

机构地区：[1]中国地质大学,北京100083

出　　处：《矿物学报》1990年第4期370-375,共6页Acta Mineralogica Sinica

摘　　要：本文在结构测定的基础上。应用穆斯堡尔谱技术。确定了钛钡铬石和钛钾铬石中铁离子的价态及结晶学位置。测试结果表明钛钾铬石中Fe的相对含量Fe^(2+)>Fe^(3+),而钛钡铬石中Fe^(2+)<Fe^(3+)。初步分析了M_2四面体位置,可能存在次近邻效应。对Mg(?)Fe之间可能的类质同象替代作了估算。Lindsleyite and mathiasite were examined by Mssbauer spectroscopy at room temperature. The preliminary results show that iron has two valence states: Fe^(2+) and Fe^(3+). Both Fe^(2+) and Fe^(3+) occupy respectively the octahedral M(3) and tetrahedral M(2) sites in the crystal lattice. The occupancy ratios of Fe^(2+) and Fe^(3+) in the lindsleyite and mathiasite have been experimentally determined. Finally their chemical formulae are discussed.

关 键 词：钛钡铬石 钛钾铬石 穆斯堡尔谱 

分 类 号：P578.44[天文地球—矿物学]