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This paper is intended as the first of a series of investigations directed at obtaining information about charge compensation in CaWO4. Vanadium, which lies immediately above niobium in the periodic table, is introduced as the microprobe. The EPR spectra produced by XX irradiation and observed at 77° and 4.2°K indicate that vanadium can occupy a variety of sites. Arguments are given that two of these, referred to as Group A and Group C, are due to vanadiums in W and Ca site, respectively

Spin-Resonance Properties of Scheelites. I. Vanadium in CaWO4