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李淑芳; 赵爽; 周潇; 李满荣
无机材料学报, 08/2020, Volume: 35, Issue: 8Journal Article
TQ174; 本工作主要研究Mn2+离子掺杂的类刚玉系氧化物Zn3TeO6(0<x≤2.0)的晶体结构与光学性质和磁性的变化.Zn3-xMnxTeO6粉末样品通过固相反应合成.Mn掺杂量的相图表明,x<1.0时保持单斜(C2/c)结构,1.0≤x≤1.6为单斜(C2/c)和三方六面体混合相(R-3),x≥1.8时完全转变为R-3相,且x=2.0时形成ZnMn2TeO6,Te-O和Mn/Zn-O键长增大,八面体发生更大畸变.X射线粉末衍射结构精修也表明R-3相中Zn/MnO6为畸变八面体.随着Mn2+掺杂含量的增加,Zn3-xMnxTeO6系列化合物不仅结构发生变化,其颜色也由浅变深.紫外吸收光谱中随着掺杂浓度的增加,400~550 nm处的吸收增强,样品的光学带隙也由3.25 eV(x=0.1)逐渐减小到2.08 eV(x=2.0),分析表明,可见区吸收的增强是源于MnO6八面体中Zn/MnO6八面体中Mn2+离子的d-d跃迁,导致样品由浅黄色逐渐变为暗黄色.磁性测试表明,固溶体的反铁磁转变温度随着Mn2+掺杂量的提高而逐渐增加,且掺入的Mn2+离子以高自旋态存在.
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