Semiconductor - Semimetal Transition in WSe 2 induced by pressure.

1. Raman Spectroscopy for High P-T by laser-heated Diamond Anvil CellYanzhang Ma, Texas Tech University , DMR 0619215 • Semiconductor - Semimetal Transition in WSe2 induced by pressure. • High pressure structural and luminescence properties of Y2O3 nanotubes. • In situ X-ray diffraction study of ReS2 at High Pressures. • The compressibility of the La - Mg - Ni alloy system. • Phase transition of nanocrystalline and bulk maghemite (γ- Fe2O3 ) to hematite (α - Fe2O3 ) induced by pressure. • The effect of sample insulation on experiment precision of resistivity measurement in a diamond anvil cell. • In situ impedance measurements in diamond anvil cell under high pressure. • In situX-ray diffraction study on icosahedral boron arsenide (B12As2) at High Pressures. The SEM image of (a) pure and (b) Eu-doped Y2O3nanotubes. The XRD patterns of Eu-doped Y2O3 NTs at high pressures. Thewavelength (a) and HWFM(b) of the strongest emission of Eu-doped Y2O3nanotubes. XRD image of ReS2 at 4.4 GPa X-ray diffraction of the La-Mg-Ni alloy. a, b, c,d refer to La2Mg16Ni, LaMg2Ni, LaMg3, andγ-La phases. X-ray diffraction patterns of ReS2 at high pressures. Carrier activation energy as a function of pressure. The insetshows resistivity vs temperature at 35.69 GPa and 42.43 GPa. Impedance of nanocrystalline ZnS under different pressure.

2. Raman Spectroscopy for High P-T by laser-heated Diamond Anvil Cell Yanzhang Ma, Texas Tech University , DMR 0619215 Visiting ScholarE. Selvi workingat CHESS Visiting Scholar F. Zhang working in HP lab at TTU Visiting Scholar F. Zhang working in HP lab at TTU Research, education and collaboration: Radial diffraction experimental research using big diamond compounds anvil (up to 3mm) in rotational diamond anvil cell. Supporting of Post Doctor, Hongyang Zhu Supporting of 3 PhD students: Cheng Ji, Dongbin Hou, and Jianzhe Wu Lab staff working with students PhD student D. Hou working in HP lab at TTU Visiting Scholar O. Tschauner RDAC installed in Beamline B2 at CHESS PhD student J. Wu working at CHESS