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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >High-pressure phase transitions in ordered and disordered Bi2Te2Se
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High-pressure phase transitions in ordered and disordered Bi2Te2Se

机译：有序和无序的Bi2Te2Se中的高压相变

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We report studies of pressure-induced phase transitions of ordered and disordered ternary tetradymite-like Bi2Te2Se by synchrotron powder X-ray diffraction (PXRD) in diamond anvil cells (DACs) for pressures up to 59 and 49 GPa, respectively. The first sample (SB) was prepared from a single crystal with ordered Se/Te sites while the second sample (Q) was prepared from a quenched melt resulting in disordered Se/Te. This allows for an investigation of the effect of disorder on the phase transitions and the equation of states (EoS) of the tetradymite-like alpha phase. Fitting of a third order Birch-Murnaghan EoS to the a phases yielded bulk moduli K-0 of 34.5(10) and 38.3(17) GPa and K' of 6.2(3) and 5.0(5) for the SB and Q samples, respectively. An electronic topological transition (ETT) was identified in both samples at pressures of 4.4 and 3.1 GPa, respectively. This was followed by a transition near 11 GPa to a phase that is isostructural with the beta phase of Bi2Te3. The Se/Te ordering only affects the transition pressure to a small extent. A cubic phase that resembles the delta phase observed in high-pressure studies of Bi2Te3 appears at 17-20 GPa, but the ternary composition leads to a more complex structure. The presence of a low angle diffraction peak in the delta phase demonstrates that the true structure is not simply body-centred cubic. In this way the samples resemble Bi2Se3 where Bi and Se show a high degree of ordering, but the proposed structure of delta-Bi2Se3 also does not fully describe the data for delta-Bi2Te2Se.
机译：我们报道了通过同步加速器粉末X射线衍射（PXRD）在金刚石砧座单元（DAC）中分别产生高达59 GPa和49 GPa的压力的压力和诱导的有序和无序三元四方体状Bi2Te2Se的相变研究。第一样品（SB）由具有有序Se / Te位点的单晶制备，而第二样品（Q）由淬火熔体制备，导致Se / Te无序化。这允许研究无序对类四方铁矿体α相的相变和状态方程（EoS）的影响。将三阶Birch-Murnaghan EoS拟合到a相可得到SB和Q样品的体模K-0为34.5（10）和38.3（17）GPa，K'为6.2（3）和5.0（5），分别。在两个样品中分别在4.4和3.1 GPa的压力下鉴定出电子拓扑转变（ETT）。随后是接近11 GPa的相转变为与Bi2Te3的β相同构的相。 Se / Te顺序仅在很小程度上影响过渡压力。类似于Bi2Te3高压研究中观察到的δ相的立方相出现在17-20 GPa，但三元组成导致结构更复杂。 δ相中低角度衍射峰的存在表明，真正的结构并非简单地以体心为立方。这样，样本类似于Bi2Se3，其中Bi和Se表现出高度的有序性，但是拟议的delta-Bi2Se3结构也不能完全描述delta-Bi2Te2Se的数据。

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