57Fe nuclear forward scattering of synchrotron radiation in hedenbergite CaFeSi2O6 at hydrostatic pressures up to 68 GPa
57Fe nuclear forward scattering of synchrotron radiation in hedenbergite CaFeSi2O6 at hydrostatic pressures up to 68 GPa
复制标题
在高达 68 GPa 的静水压力下，红辉石 CaFeSi2O6 中同步加速器辐射的 57Fe 核前向散射
DOI：
10.2138/am-1999-0329
复制
发表时间：
1999
影响因子：
3.1
通讯作者：
J. Metge
中科院分区：
文献类型：
--
作者：
L. Zhang;J. Staněk;S. Hafner;H. Ahsbahs;H. Grünsteudel;J. Metge
摘要利用同步辐射的57Fe核正向散射（NFS）和以氦为压力介质的金刚石砧，研究了在高达68 GPa的压力下，fe +在链硅酸盐hedenbergite CaFeSi2O6中的电子态。将NFS时间谱与常规Mössbauer时间谱进行了比较。室温下，hedenbergite中57Fe的NFS时间谱在53 ~ 68 GPa之间发生可逆相变，这可能是由低压下的顺磁相向高压下的磁相转变。如果这一解释是正确的，则沸腾石的n<s:1>温度TN主要取决于压力（TN = 45k at I atm）。
Abstract The 57Fe nuclear forward scattering (NFS) of synchrotron radiation and the use of diamond anvils with helium as pressure medium allowed study of the electronic state of Fe2+ in the chain silicate hedenbergite CaFeSi2O6 at pressures up to 68 GPa. Characteristics of NFS time spectra were compared with those of conventional Mössbauer spectra. NFS time spectra of 57Fe in hedenbergite revealed a reversible phase transition between 53 and 68 GPa at room temperature, which is probably a transition from the paramagnetic phase at low pressures to a magnetic phase at high pressures. If this interpretation is correct, the Néel temperature TN of hedenbergite depends critically on pressure (TN = 45 K at I atm).