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. Fig, M225 heat treated at 1100 °C during 4 h. (b) M225 heat treated at 1100 °C during 22 h. (c) EPR spectra of heat treated samples, (1) M25 heat treated 2 h at 950 °C and 2 h (solid line) or 20 h (dashed line) at 1100 °C and

. Fig, EPR spectra (MP = 20 mW) of powellite CaMoO4 (solid line) and CaMoO4 doped with 0.15 mol% of Gd 2 O 3 (dashed line) Only g values observed in the glass-ceramics are reported here