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首页> 外文期刊>Physical review >Pressure-induced phase transition of Bi_2Te_3 to a bcc structure
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Pressure-induced phase transition of Bi_2Te_3 to a bcc structure

机译：压力诱导的Bi_2Te_3到bcc结构的相变

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摘要

The pressure-induced phase transition of bismuth telluride, Bi_2Te_3, has been studied by synchrotron x-ray diffraction measurements at room temperature using a diamond-anvil cell (DAC) with loading pressures up to 29.8 GPa. We found a high-pressure body-centered cubic (bcc) phase in Bi_2Te_3 at 25.2 GPa, which is denoted as phase Ⅳ, and this phase appears above 14.5 GPa. Upon releasing the pressure from 29.8 GPa, the diffraction pattern changes with pressure hysteresis. The original rhombohedral phase is recovered at 2.43 GPa. The bcc structure can explain the phase Ⅳ peaks. We assumed that the structural model of phase Ⅳ is analogous to a substitutional binary alloy; the Bi and Te atoms are distributed in the bcc-lattice sites with space group Im3m. The results of a Rietveld analysis based on this model agree well with both the experimental data and calculated results. Therefore, the structure of phase Ⅳ in Bi_2Te_3 can be explained by a solid solution with a bcc lattice in the Bi-Te (60 atomic % tellurium) binary system.
机译：碲化铋Bi_2Te_3的压力诱导相变已通过使用金刚石砧盒（DAC）在室温下以高达29.8 GPa的加载压力通过同步加速器X射线衍射测量进行了研究。我们在Bi_2Te_3的25.2 GPa处发现了一个高压体心立方（bcc）相，称为Ⅳ相，该相出现在14.5 GPa以上。从29.8 GPa释放压力后，衍射图样会随压力滞后而变化。最初的菱面体相在2.43 GPa时恢复。 bcc结构可以解释Ⅳ期峰。我们假设Ⅳ相的结构模型类似于替代二元合金。 Bi和Te原子分布在空间群为Im3m的bcc晶格位置。基于此模型的Rietveld分析结果与实验数据和计算结果均吻合良好。因此，Bi_2Te_3中Ⅳ相的结构可以用Bi-Te（60原子％碲）二元体系中具有bcc晶格的固溶体来解释。

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  • 来源
    《Physical review》 |2011年第9期|p.092102.1-092102.4|共4页
  • 作者

    Mari Einaga; Ayako Ohmura; Atsuko Nakayama; Fumihiro Ishikawa; Yuh Yamada; Satoshi Nakano;

  • 作者单位

    Graduate School of Science & Technology, Niigata University 8050 Ikarashi-Ninocho, Nishi-ku, Niigata, Niigata 950-2181, Japan;

    Centerfor Transdisciplinary Research, Niigata University 8050 Ikarashi-Ninocho, Nishi-ku, Niigata, Niigata 950-2181, Japan;

    Centerfor Transdisciplinary Research, Niigata University 8050 Ikarashi-Ninocho, Nishi-ku, Niigata, Niigata 950-2181, Japan;

    Graduate School of Science & Technology, Niigata University 8050 Ikarashi-Ninocho, Nishi-ku, Niigata, Niigata 950-2181, Japan;

    Department of Physics, Niigata University 8050 Ikarashi-Ninocho, Nishi-ku, Niigata, Niigata 950-2181, Japan;

    National Institute for Materials Science (N1MS), 1-1 Namiki, Tsukuba 305-0044, Japan;

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  • 正文语种 eng
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  • 关键词

    crystallographic aspects of phase transformations; pressure effects; high-pressure apparatus; shock tubes; diamond anvil cells;

    机译：相变的晶体学方面;压力效应;高压仪器;冲击管钻石砧细胞;

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