Natural Science Research Center, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, China.
Inorg Chem. 2011 Nov 21;50(22):11291-3. doi: 10.1021/ic201731k. Epub 2011 Oct 18.
A new type of disordered substitution alloy of Sb and Te at above 15.1 GPa was discovered by performing in situ high-pressure angle-dispersive X-ray diffraction experiments on antimony telluride (Sb(2)Te(3)), a topological insulator and thermoelectric material, at room temperature. In this disordered substitution alloy, Sb(2)Te(3) crystallizes into a monoclinic structure with the space group C2/m, which is different from the corresponding high-pressure phase of the similar isostructural compound Bi(2)Te(3). Above 19.8 GPa, Sb(2)Te(3) adopts a body-centered-cubic structure with the disordered atomic array in the crystal lattice. The in situ high-pressure experiments down to about 13 K show that Sb(2)Te(3) undergoes the same phase-transition sequence with increasing pressure at low temperature, with almost the same phase-transition pressures.
在室温下，通过对拓扑绝缘体和热电材料碲化锑 (Sb(2)Te(3)) 进行原位高压角分辨 X 射线衍射实验，发现了一种在 15.1GPa 以上的新型无序取代 Sb 和 Te 的合金。在这种无序取代的合金中，Sb(2)Te(3)结晶为具有空间群 C2/m 的单斜结构，与类似的等结构化合物 Bi(2)Te(3)的相应高压相不同。在 19.8GPa 以上，Sb(2)Te(3)采用体心立方结构，晶格中的原子排列无序。在约 13K 的原位高压实验表明，Sb(2)Te(3)在低温下随压力升高经历相同的相变序列，相变压力几乎相同。
