Počet záznamů: 1  

Phase transition of LaX (X = P, As, Sb and Bi) at high pressure: Theoretical investigation of the structural and electronic properties

  1. 1. 0343297 - UEK-B 2011 RIV GB eng J - Článek v odborném periodiku
    Charifi, Z. - Reshak, Ali H - Baaziz, H.
    Phase transition of LaX (X = P, As, Sb and Bi) at high pressure: Theoretical investigation of the structural and electronic properties.
    Solid State Communications. Roč. 148, 3-4 (2008), s. 139-144. ISSN 0038-1098
    Výzkumný záměr: CEZ:AV0Z60870520
    Klíčová slova: Metals * Electronic band structure * Density functional theory (DFT)
    Kód oboru RIV: BO - Biofyzika
    Impakt faktor: 1.557, rok: 2008

    The electronic and structural properties of the Lanthanum pnictides LaX (X = P, As, Sb and Bi) in the two phases: rock-salt (B1), and primitive tetragonal (PT) have been studied using the full-potential linearized augmented plane wave (FP-LAPW) method. We used both the local-density approximation (LDA) and the generalized gradient approximation (GGA), which is based on exchange-correlation energy optimization to calculate the total energy. Also we have used the Engel-Vosko GGA formalism, which optimizes the corresponding potential for band structure calculations. We notice that below 19 GPa and around 17 GPa, 9 GPa and 8 GPa, respectively, LaP, LaAs, LaSb and LaBi maintain the rock-salt structure (B1). At high pressure there occurs a crystallographic phase transition. In all compounds, the high pressure phases are tetragonal structure. The ground state properties of these compounds such as equilibrium lattice constant, bulk modulus are calculated and compared with available literature.
    Trvalý link: http://hdl.handle.net/11104/0185808