Elastic stiffness constants of copper indium diselenide determined by neutron scattering.

Abstract

From the acoustic-dispersion curves determined by inelastic neutron scattering, we obtain at room temperature the elastic stiffness constants of CuInSe 2 : at 10 10 Nm -1 , c 11 =9.70, c 12 =5.97, c 13 =8.60, c 33 =10.89, and c 44 =3.62. A theoretical calculation based upon the sphalerite approximation gives good agreement with the values of c 11 and c 44 . Using the elastic constants, the isothermal compressibility is calculated along the c axis and the ab plane