Some physical properties of LaFe4P12 type compounds
Some physical properties of LaFe4P12 type compounds
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LaFe4P12型化合物的一些物理性质
DOI：
10.1016/0022-3697(84)90128-8
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发表时间：
1984
影响因子：
4
通讯作者：
W. Jeitschko
中科院分区：
文献类型：
--
作者：
F. Grandjean;A. Gérard;D. J. Braung;W. Jeitschko
通过X射线衍射、磁化率和电导率测量以及穆斯堡尔谱研究了几种具有填充方钴矿（LaFe_4P_（12）型）结构的磷属元素化合物。CeFe_4P_（12）单晶X射线衍射数据的结构精修得到11个变量参数和317个反射的常规残差值为0.022。LaFe_4P_（12）和CeFe_4P_（12）在室温下是顺磁性的。EuFe_4P_（12）是一种铁磁体，居里温度为99 K。CeFe_4P_（12）和CeFe_4As_（12）是半导体。LaFe_4Pn_（12）（Pn=P，AsorSb）和CeFe_4Sb_（12）显示金属导电性。LaFe_4P_（12）、CeFe_4P_（12）和EuFe_4P_（12）的室温~（57）Fe穆斯堡尔谱均为对称双峰。同分异构体位移与低自旋或金属Fe相容。在1.5 K下，EuFe 4P 12的~（57）Fe穆斯堡尔谱在外场作用下显示Fe不携带任何磁矩，而在4.2和300 K下的~（151）Eu穆斯堡尔谱显示出不寻常的超精细参数。
Several pnictides with the filled skutterudite (LaFe4P12type) structure were investigated by X-ray diffraction, magnetic susceptibility and electrical conductivity measurements and Mössbauer spectroscopy. The structure refinement of CeFe4P12from single crystal X-ray data resulted in a conventional residual value of 0.022 for 11 variable parameters and 317 reflections. LaFe4P12and CeFe4P12are paramagnetic at room temperature. EuFe4P12is a ferromagnet with a Curie temperature of 99 K. CeFe4P12and CeFe4As12are semiconducting. LaFe4Pn12(Pn=P,AsorSb) and CeFe4Sb12show metallic conductivity. The room temperature57Fe Mössbauer spectra of LaFe4P12, CeFe4P12and EuFe4P12are symmetrical doublets. The isomer shifts are compatible with low spin or metallic Fe. At 1.5 K the57Fe Mössbauer spectrum of EuFe4P12under an external field shows that Fe does not carry any magnetic moment.151Eu Mössbauer spectra of EuFe4P12at 4.2 and 300 K show unusual hyperfine parameters.