2010/12/22 by Mari Einaga, Ayako Ohmura, Atsuko Nakayama +4 · 1 citation
Chemistry · Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Advanced Thermoelectric Materials and Devices #Bismuth #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Diamond anvil cell #Diffraction #High-pressure geophysics and materials #Materials science #Metallurgy #Optics #Phase (matter) #Phase transition #Physics #Rietveld refinement #Topological Materials and Phenomena #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.83.092102
12 pages, 5 figures
arxiv created 2010/12/22 · openalex publication_date 2011/03/17 · arxiv updated 2015/05/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The pressure-induced phase transition of bismuth telluride, Bi2Te3, 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 Bi2Te3 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 Bi2Te3 can be explained by a solid solution with a bcc lattice in the Bi-Te (60 atomic % tellurium) binary system.