Films of vitreous germanium selenide GeSe modified with iron impurities are investigated using ~(57)Fe Mossbauer spectroscopy.It is found that,at low temperatures T<295 K,the iron impurity centers are stabilized in three structurally nonequivalent positions;more specifically,the Fe~(3+)impurity centers are stabilized in octahedral and tetrahedral positions,whereas the Fe~(2+)impurity centers are stabilized in octahedral positions.At higher temperatures T >295 K,the iron impurity centers located in octahedral and tetrahedral positions undergo a rapid electron exchange,which leads to the formation of an "averaged"iron state.
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