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首页> 外文期刊>Physica status solidi, B. Basic research >Monoclinic structure and electrical properties of metastable Sb2Te3 and Bi0.4Sb1.6Te3 phases
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Monoclinic structure and electrical properties of metastable Sb2Te3 and Bi0.4Sb1.6Te3 phases

机译：亚稳Sb2Te3和Bi0.4Sb1.6Te3相的单斜结构和电学性质

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摘要

We synthesized metastable phases of Sb2Te3 and Bi0.4Sb1.6Te3 by quenching after high-pressure (4 GPa) and high-temperature (873 K) treatment and specify them as m-Sb2Te3 and m-Bi0.4Sb1.6Te3. The metastable phases of both alloys crystallize in the same structure type. The crystal structure of metastable phases, determined by the powder X-ray and electron diffraction methods, is monoclinic (C2/m). The cell dimensions of m-Sb2Te3 are: a = 15.644(80) angstrom, b = 4.282(8) angstrom, c = 9.382(20) angstrom, beta = 89.70(5)degrees, the cell dimensions of m-Bi0.4Sb1.6Te3 diverge by a hundredth of angstrom units and monoclinic angle - by tenths of a degree. We revealed that the structure of beta-Sb2Te3-phase, observed in situ under high pressure, may be represented as a structure of m-Sb2Te3-type and thus it can be retained at ambient conditions. We investigated the temperature dependencies of the electrical resistivity and the Hall coefficient of recovered samples in the range of T = 1.8-450 K. The structure of metastable phases possesses metallic type bonding and m-Sb2Te3 phase is superconductive at T < 2K. The ab initio study verified metallic character of the quenched phases. After annealing at 673K during 2.5 h the structures of the recovered samples Sb2Te3 and Bi0.4Sb1.6Te3 returned to initial rhombohedral symmetry. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
机译：我们通过高压（4 GPa）和高温（873 K）处理后的淬灭反应合成了Sb2Te3和Bi0.4Sb1.6Te3的亚稳相，并将它们指定为m-Sb2Te3和m-Bi0.4Sb1.6Te3。两种合金的亚稳态相以相同的结构类型结晶。通过粉末X射线和电子衍射法确定的亚稳态相的晶体结构是单斜晶（C2 / m）。 m-Sb2Te3的细胞尺寸为：a = 15.644（80）埃，b = 4.282（8）埃，c = 9.382（20）埃，beta = 89.70（5）度，m-Bi0.4Sb1的细胞尺寸.6Te3发散了百分之一埃，单斜角发散了十分之一度。我们揭示了在高压下原位观察到的β-Sb2Te3-相的结构可以表示为m-Sb2Te3-型的结构，因此可以在环境条件下保留。我们研究了电阻率和霍尔系数在T = 1.8-450 K范围内的温度依赖性。亚稳相的结构具有金属键，m-Sb2Te3相在T <2K时具有超导性。从头算研究证实了淬火相的金属特性。在673K退火2.5小时后，回收的样品Sb2Te3和Bi0.4Sb1.6Te3的结构恢复到最初的菱面体对称性。 （C）2014 WILEY-VCH Verlag GmbH＆Co.KGaA，Weinheim

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