ESR spectra of KClO4crystals irradiated with x rays at 10 and at 26deg;K contain three ldquo;familiesrdquo; of intense signals. The signals are assumed to derive from primary defects constituted by electrons and holes trapped on ClO4minus;ions. The families of signals are assigned to the species ClO4equals;, ClO4, and (ClO4)2minus;, each trapped in a number of distinct sites. ClO4equals;and ClO4appear to be stabilized by intraionic configuration change, whereas interionic configuration change may stabilize (ClO4)2minus;. Thermal processes starting at 30deg;K result in formation of the secondary defects O3minus;from ClO4equals;and ClO2from ClO4and in destruction of (ClO4)2minus;.
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