Pressure-induced structural transformation in potassium stanichloride has been studied by x-ray diffraction at room temperature. The change in the diffraction pattern started at about a pressure of 15 kbar and continued upto 50 kbar. The pattern recorded at about 50 kbar could be indexed basing on an orthorhombic lattice, with lattice parametersa=7.32,b=7.02 andc=8.02 Å.

The lattice parameters of the compound copper indium disulphide (CuInS₂) have been measured by x-ray diffraction. The data have been used to evaluate the coefficients of thermal expansion, perpendicular and parallel to the principal axis. The thermal expansion studies revealed the anisotropy between the axial expansion coefficients having a larger coefficient of expansion alonga axis than that alongc axis. The anisotropic thermal expansion of this compound is interpreted in terms of the thermal expansion of the Cu-S and In-S bonds.

Lattice parameters of chalcopyrite type compound silver indium disulphide (AgInS₂) were determined as a function of temperature by the x-ray method in the temperature range 28 to 685°C. Using these data, the coefficients of thermal expansion,a_⊥ anda_‖, were evaluated by a graphical method. The temperature dependence ofa_⊥ anda_‖ is represented by a suitable equation. The anisotropic thermal expansion of AgInS₂ is explained in terms of the thermal expansion of the Ag-S and In-S bonds of the AgInS₂ lattice.