The position and valency of Fe,Cr and Mn impurities in Bi_4Ge_3O_(12) crystalwere studied by means of electron paramagnetic resonance.

• 用电子顺磁共振方法对 fe、Cr 和 Mn 杂质在 Bi_4Ge_3O_(12)晶体中的位置和价态进行了研究。