High-pressure experimental evidence for metal FeO with normal NiAs-type structure
High-pressure experimental evidence for metal FeO with normal NiAs-type structure
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DOI：
10.1103/physrevb.82.174120
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发表时间：
2010-11-19
影响因子：
3.7
通讯作者：
Ohishi, Yasuo
中科院分区：
文献类型：
--
作者：
Ohta, Kenji;Hirose, Kei;Ohishi, Yasuo
我们测量了Fe0.96O(以下简称FeO)在169 Gpa和2050K的高压和高温下的电导率(Sigma)，同时进行了同步辐射X射线衍射测量。结果表明，在140 Gpa以上合成的B8结构的FeO(B8FeO)具有正常的NiAs型结构，在150 Gpa和300K下的电导率约为3×10(5)S/m。B8FeO的电导率随着温度的升高而降低，这是一种金属行为，与B1和菱面体扭曲的B1(Rb1)相的半导体行为相反。然而，在相同的压力下，B1和Rb1相的电导率与金属B8相的电导率相差不大。
We measured the electrical conductivity (sigma) of Fe0.96O (FeO hereafter) at high pressures and temperatures up to 169 GPa and 2050 K, simultaneously with the synchrotron x-ray diffraction measurements. The results showed that a B8-structured FeO (B8 FeO) synthesized above 140 GPa adopts a normal NiAs-type structure and has an electrical conductivity of about 3 x 10(5) S/m at 150 GPa and 300 K. The conductivity of B8 FeO decreased with increasing temperature, which is a metallic behavior, in contrast to the semiconducting behaviors of the B1 and rhombohedrally distorted B1 (rB1) phases. However, the conductivities of the B1 and rB1 phases are not much different from that of the metallic B8 phase at equivalent pressures.