Since stillwellite-type ferroelectric LaBGeO 5 shows the intriguing physical properties by the doping/substituting-modification, the stillwellite-type glass-ceramics has been studied extensively from viewpoint of material engineering. In this study, we examined how the Nd-doping affects the glassy ferroelectric LaBGeO 5 and its modified sample, LaBSi 0.4 Ge 0.6 O 5 . We experimentally demonstrated that small amount of the doping gives a significant effect on the crystallization and phase-separation trends.

Absorption spectra of FA centres were studied in Li-doped KCI-KBr and KCI-RbCl mixed crystals. In KCI-KBr, light-induced spearal shifts were observed a[ liquid nitrogen temperature. for the FA, band towards lower energy and for the FM band towards higherenergy. The shifts axe thought 10 be due to structural change where the electron-occupied vacancy finds a new location in relation to the neighbouring chlorine and bromine ions.

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