HARDENING REGULARITIES OF DOPED NaCl SINGLE CRYSTALS UNDER UNIAXIAL COMPRESSION WITHIN TEMPERATURE INTERVAL 293-773K

The changes of plastic deformation parameters (yield stress sy, deformation stress se) for the NaCl crystals doped with different two-valent impurities (Mg, Mn, Pb, Cd, Sr, Ca) for the high temperature region (T>293K) were investigated. The anomalous region, suitable for the yield stress increase, but not the regular decrease, on the sy(T) dependences at the high temperatures was revealed. Analogous phenomenon occurs for the se too. It was first established that the anomalous hardening of doped NaCl crystals at elevated temperatures is dependent on the type, concentration and state of impurity, on the temperature and rate of deformation and is connected with the value of the impurity hardening. The interpretation of the experimental facts and phenomena was proposed