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在化学计量的Bi<sub>2</sub>O<sub>3</sub>(5N)和 GeO<sub>2</sub>(6N)的配料里,加入0.01wt%Nd<sub>2</sub>O<sub>3</sub>,0.01wt%Er<sub>2</sub>O<sub>3</sub>,0.02wt%Cr<sub>2</sub>O&l