Electrical and Magnetic Properties of La1−xCexRu4P12and CeOs4P12with the Skutterudite Structure
Electrical and Magnetic Properties of La1−xCexRu4P12and CeOs4P12with the Skutterudite Structure
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方钴矿结构La1−xCexRu4P12和CeOs4P12的电学和磁学性质
DOI：
10.1006/jssc.1998.8003
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发表时间：
1999
影响因子：
5.4
通讯作者：
N. Hamaya
中科院分区：
文献类型：
--
作者：
I. Shirotani;T. Uchiumi;C. Sekine;M. Hori;S. Kimura;N. Hamaya
通过对粉末X射线衍射数据的Rietveld分析，确定了LaRu4P12和CeRu4P12的晶体结构。得到了两种磷化物的键距和键角。La1−xCexRu4P12(x=0，0.1，0.2，0.3，0.4，0.5，0.6，0.7，0.75，0.8，0.9和1)和CeOs4P12是在高温高压下制备的。在室温下研究了合金的粉末X射线衍射谱。合金的晶格参数并不随x的增加而线性变化，而是在x<；0.4和x=0.6之间明显偏离线性。合金中Ce原子的形式氧化数为+3，低于x=0.6。研究了CeRu4P12和CeOs4P12合金的低温电磁性能。在X=0.6时，出现了金属-绝缘体的转变和磁有序。Abovex=0.7，合金表现为半导体。CeOS4P12表现出半导体行为，激活能为0.034 eV。CeRu4P12和CeOs4P12表现出非常小的、几乎与温度无关的磁化率。讨论了CeRu4P12和CeOs4P12合金的电磁性能。
The crystal structures of LaRu4P12and CeRu4P12are refined by the Rietveld analysis of the powderX-ray diffraction data. The bond distances and bond angles in both phosphides are obtained. La1−xCexRu4P12(x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.8, 0.9, and 1) and CeOs4P12are prepared at high temperatures and high pressures. Powder X-ray diffractions of the alloys are studied at room temperature. The lattice parameters of the alloys do not change linearly with increasingxand markedly deviate from linear betweenx<0.4 andx=0.6. The formal oxidation number of Ce atoms in the alloys is +3 belowx=0.6. The electrical and magnetic properties of the alloys CeRu4P12and CeOs4P12are studied at low temperatures. The metal-to-insulator transition and magnetic ordering appear at aroundx=0.6. Abovex=0.7 the alloys behave as a semiconductor. CeOs4P12exhibits a semiconducting behavior, with an activation energy of 0.034 eV. CeRu4P12and CeOs4P12show a very small, nearly temperature-independent susceptibility. Electrical and magnetic properties of the alloys, CeRu4P12and CeOs4P12are discussed.