INFLUENCE OF HYDROSTATIC PRESSURE ON THE PHASE TRANSITION IN Ni(NH_3)_6I_2: EPR STUDIES

摘要

Electron paramagnetic resonance techniques are used to determine the phase transition temperature T_c of Ni(NH_3)_6I_2 as a function of hydrostatic pressure. The hydrostatic pressure causes T_c to increase and the value of the pressure coefficient dT_c/dp is (10±2)K/GPa. T_c and dT_c/dp for hexammine halides is calculated on the basis of the "rigid-sphere model" and good agreement with the experimental data is obtained.