An ab initio study of ground state, electronic and thermodynamical properties of GaP and Ga2P
- 129 Downloads
In the present paper, we report an ab initio calculation of the ground state, electronic and thermodynamical properties like constant volume lattice specific heat, vibrational energy, internal energy, and entropy for GaP and Ga2P is presented. These properties are obtained after calculating the phonon spectrum over the entire Brillouin zone. The calculations were performed using the ABINIT program package, which is based on density functional theory (DFT) method and the use of pseudopotentials and plane wave expansion. Difference in the ground state properties such as electronic structure and thermodynamical properties are discussed. The thermodynamical properties follow the expected trend. There is a good agreement between present theoretical and limited available experimental data in the case of ground state such as lattice constant and bulk modulus and electronic properties. With the increase of Ga atoms in the unit cell the semiconducting nature of Ga2P turns to metallic. There is a noticeable difference in the thermodynamical properties in the case of both gallium compounds.
KeywordsThermal properties Semiconductor Density functional theory Band structure
Computations were carried out on the computer cluster PAWAN at the Department of Physics, Bhavnagar University financed by the Department of Science and Technology, Govt. of India and the University Grant Commission, New Delhi.
- 2.Mujica A, Rubio A, Munoz A, Needs RJ. High-pressure phases of group-IV, III–V, and II–VI compounds. Rev Mod Phys. 2003;75:863–912 and References there in.Google Scholar
- 6.Mead RD, Stevens AE, Lineberger WC, Bowers MT, editors. Gas phase ion chemistry, vol. III. New York: Academic Press; 1984.Google Scholar
- 11.Taylor TR, Asmis KR, Gomez H, Neumark DM. Vibrationally resolved anion photoelectron spectra of GaX2 −, Ga2X−, Ga2X2 −, and Ga2X3−(X = P, As). J Chem Phys (in press).Google Scholar
- 17.Weast RC. Handbook of chemistry and physics. 62nd ed. Boca Raton, FL: Chemical Rubber; 1981. p. E99–E103.Google Scholar