title: Electronic and elastic properties of CaF(2) under high pressure from ab initio calculations.
abstract: Calcium fluoride CaF(2) has been studied by using density functional theory (DFT) with the generalized gradient approximation (GGA). Our results demonstrate that the sequence of the pressure-induced structural transition of CaF(2) is the fluorite structure ([Formula: see text]), the orthorhombic cotunnite-type structure (Pnma), and the hexagonal Ni(2)In-type structure (P6(3)/mmc). The two transitions occur at pressures of 8 GPa and 105 GPa, accompanied by volume collapses of 8.4% and 1.2%, respectively. The energy band gap increases with pressure in the [Formula: see text] and the forepart of Pnma phases. However, on increasing the pressure beyond 60 GPa, the gap decreases, which is due to the fluorine p(z)-states shifting toward the Fermi energy. In addition, the elastic properties versus pressure are also discussed. Our calculated elastic constants for the cubic phase at ambient pressure are in agreement with the experimental values. The stress-strain coefficient calculations show that shear transformations in the Pnma phase are more difficult than in the cubic phase and the compressibility along the c(h) (or a(o)) direction for the orthorhombic phase is stronger than that in the hexagonal crystal.
authors.affiliation: Department of Physics, Condensed Matter Theory Group, Uppsala University, Box 530, S-751 21 Uppsala, Sweden. Applied Materials Physics, Department of Materials and Engineering, Royal Institute of Technology (KTH), S-100 44 Stockholm, Sweden. Beijing Institute of Technology, Department of Physics, Beijing 100081, People's Republic of China.
authors.forename: H
authors.initials: H
authors.lastname: Shi
authors.forename: W
authors.initials: W
authors.lastname: Luo
authors.forename: B
authors.initials: B
authors.lastname: Johansson
authors.forename: R
authors.initials: R
authors.lastname: Ahujia