Abstract
Abstract In many synthetic pyrite single crystals of high quality and purity we could detect Cr3 + and Ni2 + by EPR at 78 K as unwanted impurities. The assignment was possible by means of the isotopes Cr53 and Ni61, occurring in natural abundance. The paramagnetic centers exhibit unusual g-values. In case of Ni2 + a ligand hyperfine interaction could be observed beside the normal hyperfine interaction with the Ni61 nucleus. For some crystals the Cr 3 + signal intensity could be increased up to ten times by temperature increasement from 78 K to about 100 K. At 78 K the Cr3 + intensity was quenched by IR irradiation.
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