Abstract:
The microhardness and thermal stability of mixed K$_2$Co$_x$Ni$_{1-x}$(SO$_4)_2\,{\cdot}\,$6H$_2$O crystals have been studied for the $\{110\}$ and $\{001\}$ growth sectors. Maxima of the onset temperature of dehydration have been found at $x\approx 0.1$ and $x\approx 0.9$. The structure of the $\{110\}$ and $\{001\}$ growth sectors has been studied. The observed changes in the properties have been attributed to the degree of imperfection of crystals depending on their sectoral inhomogeneity.