Boron phosphide under pressure: In situ study by Raman scattering and X-ray diffraction
Abstract
Cubic boron phosphide, BP, has been studied in situ by X-ray diffraction and Raman scattering up to 55 GPa at 300 K in a diamond anvil cell. The bulk modulus of B0 = 174(2) GPa has been established, which is in excellent agreement with our ab initio calculations. The data on Raman shift as a function of pressure, combined with equation-of-state (EOS) data, allowed us to estimate the Grüneisen parameters of the TO and LO modes of zinc-blende structure, γGTO = 1.26 and γGLO = 1.13, just like in the case of other AIIIBV diamond-like phases, for which γGTO > γGLO ≅ 1. We also established that the pressure dependence of the effective electro-optical constant α is responsible for a strong change in relative intensities of the TO and LO modes from ITO/ILO ∼ 0.25 at 0.1 MPa to ITO/ILO ∼ 2.5 at 45 GPa, for which we also find excellent agreement between experiment and theory.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 15, 2014
- Source ID
- 10.1063/1.4890231
Entities
People
- Aleksandr V. Kurnosov
- Artem Oganov
- Oleksandr O. Kurakevych
- Vladimir L. Solozhenko
- Yann Le Godec
Organizations
- Agence Nationale de la Recherche
- Brookhaven National Laboratory
- Defense Advanced Research Projects Agency
- Stony Brook University
- University of Bayreuth