摘要
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。测试并分析了和 Fe^(3+)和 Cr^(3+)离子的 EPR 谱线位置随磁场方向的变化,确定了 Fe^(3+)和 Cr^(3+)主要进入氧四面体占据 Ge位。测试并分析了 Mn^(4+)和Mn^(2+)掺杂样品各向异性的 EPR 谱线,也测试了处于晶体粉末态及玻璃态的 Mn 掺杂样品的谱线,认为 Mn^(2+)离子进入氧八面体占据 Bi 位。紫外线辐照后 Mn 离子 EPR 信号降低表明辐照导致 Mn 离子价态改变。
The position and valency of Fe,Cr and Mn impurities in Bi_4Ge_3O_(12) crystalwere studied by means of electron paramagnetic resonance.The variation of EPRspectra of Fe^(3+) and Cr^(3+) with magnetic field directions was measured and analysed.It was determined that Fe^(3+) and Cr^(3+) ions mainly situated in Ge sites of oxygentetrahedra.The anisotropic EPR spectra of Mn^(4+) doped and Mn^(2+) doped sampleswere measured and analysed,and the spectra of Mn doped samples in crystal pow-der state and in glass state were also measured.It was estimated that Mn^(2+) ionssituated in Bi sites of oxygen octahedra,The decrease of EPR signal intensity ofMn ion means the change of the valency of Mn after ultraviolet irradiation.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第2期139-143,共5页
Journal of Inorganic Materials
基金
南京大学固体微结构物理开放实验室基金
关键词
锗酸铋
晶体
电子顺磁共振
Bismuth Germanate
Bi_4Ge_3O_(12)
Electron paramagnetic resonance
Doped crystal
