Abstract
The electron paramagnetic resonance of Mn2+ in both the crystal and glass form of ZnCl2 has been studied at 9 and 35 GHz. The spectra are found to fit the same spin Hamiltonian but with different values of D and E. Glass to crystal and crystal to glass transformations were induced by heat treatment and neutron irradiation, respectively. The changes of the crystal field parameters and of their distributions show that both transformations can be described in terms of short-range and long-range processes which take place successively. A short-range ordering process is observed at the beginning of devitrification before any change in the x-ray diffraction pattern is detected. Irradiation of the crystal shows that a long-range disordering process begins after only 5 × 1016 fast neutrons/cm2.
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