【作者】 苏文； 施倪承； 刘密兰； 马喆生； 李哲； Alexandr KHOMYAKOV；

【Author】 SU Wen,SHI NiCheng,LIU MiLan,MA ZheSheng,LI Zhe,Alexandr KHOMYAKOV 1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2.Department of Geology,China Geoscience University,Beijing 100083,China 3.Instrumental Analysis Center,Jilin University,Changchun,Jilin Province,130023,China 4.Department of Geology,Moscow State University,Moscow,Russia

【机构】 中国科学院地质与地球物理研究所； 中国地质大学； 吉林大学仪器测试中心； 莫斯科大学地质系；

【摘要】 本文对产于俄罗斯希宾地区的单斜星叶石进行了不同的温度条件下的穆斯堡尔光谱效应研究,通过在温度分别在298 K,180 K和80 K条件下的分析,发现单斜星叶石由2个Fe²⁺和1个Fe³⁺四极双峰组成,并进行了单斜星叶石中的畸变参数包括八面体键角（σ²）和键长变量（△）的计算。但是,在两个畸变参数之间存在着明显的差异,将无法对它们的穆斯堡尔参数和四极双峰进行指派。本文对温度在同质异能位移和四极分裂中的作用进行了探讨,根据通过穆斯堡尔效应和f(Fe³⁺（O）)/(Fe²⁺（O）)的平均值获得的三价铁对全铁的比值,改写了单斜星叶石的化学式。更多还原

【Abstract】 Monoclinic astrophyllite from Kala Peninsula,Russia was investigated by ⁵⁷Fe Mossbauer effect.The Mossbauer spectra of the sample at 298 K,180 K and 80 K were measured.Each spectrum of monoclinic astrophyllite consists of two Fe²⁺ and one Fe³⁺ quadrupole doublets.The distortion parameters,the variances of the octahedral bond anglesσ² and the normalized bond-length variationΔfor monoclinic astrophyllite were calculated.However,since a discrepancy between two distortion parameters exists, an assignment of the quadrupole doublet to iron at the specific site was not given.Temperature dependences of the isomer shift and the quadrupole splitting were presented and discussed.According to the ratio of ferric to total iron obtained by the M（o|¨）ssbauer effect and the mean value of f(Fe³⁺（O） )/f(Fe²⁺（O） ),the chemical formula of monoclinic astrophyllite was rewritten.更多还原