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Electron spin resonance in synthetic phenacite (Be 2 SiO 4 ) single crystals doped with Cr 2 O 3 is observed at about 77 K and 4.2 K at 9.5 GHz with g z =1.9929±0.008, g x =1.9505±0.0005 and g y =1.9581±0.0004 and the hyperfine coupling constant A for 53 Cr=25.2±0.2 gauss. The ESR signal is enhanced considerably by X-ray irradiation (35 kV, 18 mA, 8 hr). It is proved that this spectrum is attributed to Cr 5+ ion located either at the Be or at the Si sites.
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Tsukioka et al. (1972) studied this question.
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