PHOTOACOUSTIC MEASUREMENT OF THERMAL-PROPERTIES OF KCL1-XBRX-EU2-CRYSTALS( MIXED)

The thermal diffusivity, thermal conductivity and heat capacity of mix ed crystals of KCl1-XBrX:Eu2+ (0 less than or equal to X less than or equal to 1) were obtained using the open photoacoustic cell technique and the temperature-rise method. The thermal diffusivity and thermal c onductivity show a nonlinear behavior as a function of the concentrati on X. This behavior is explained by the disorder in the material due t o the random distribution of the Cl and Br atoms in the lattice sites, The EU(2+) dopant does not affect the composition dependence of these thermal properties.