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Bi2O3-GeO2 crystals such as Bi4Ge3O12 (Bi∶Ge=4∶3), Bi2GeO5 (Bi∶Ge=2∶l), and Bi12GeO20 (Bi∶Ge=12∶1) have various optical and electrical functions, so that they have a potential for applications in various fields.Especially, Bi4Ge3O12 crystal has magneto-optical, electro-optical, good fluorescence, and scintillation properties1-2).