X-ray induced luminescence, photoluminescence and thermoluminescence of nominally pure Bi 4 Ge 3 O 12 crystals are studied within the 12K-295K temperature range. The broad emission band reported by other workers for radio- and photoluminescence is observed to present some structure. thermoluminescence spectra exhibit eight major glow peaks whose wavelength spectra present a structure similar to that of radio-and photoluminescence emissions. This structure is discussed in terms of Bi 3+ intra-ionic transitions.
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Diéguez et al. (1985) studied this question.
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