【摘要】 采用提拉法生长了掺Ｃｒ的Ｓｒ３Ｇａ２Ｇｅ４Ｏ１４低温石榴石结构型单晶，测量了它的吸收光谱及其偏振特性，系统描述了该晶体在可见和近红外波段各吸收带的特征，指出Ｃｒ在此晶体晶格中主要存在两种价态Ｃｒ３＋和Ｃｒ４＋，Ｃｒ４＋在近红外的吸收将影响到Ｃｒ３＋的发光。更多还原

【Abstract】 Single crystals of Cr3Sr3Ga2Ge4O14 garnets are grown by using the Czochralskimethod in Platimum-rhodium crucible. The polarised optical absorption spectra of Cr aremeasured. The schematic description on the absorped bands in visible and near-IRwavelensth is presented. We suggest that Cr enters the octahedral and tetrahedralpositions as Cr3+ and Cr4+ respectively. The near-IR absorption of Cr4+ will affect theluminescence of Cr3+.更多还原