低温燃烧技术合成钴掺杂镓酸镁锌复合尖晶石材料

采用Mg(NO3)2·4H2O,Ga(NO3)3·6H2O,Zn(NO3)2·6H2O,CO(NH2)2,NH4NO3及Co(NO3)2·6H2O等为原料,于500℃利用低温燃烧技术成功获得了一系列钴掺杂镓酸镁锌复合尖晶石材料。采用X-射线衍射仪(XRD)、透射电镜(TEM)、F-4500型荧光分光光度计对样品进行分析表征。结果表明,所得产品不是MgGa2O4和ZnGa2O4的简单混合物,而是一种新型的固溶体材料。ZnxMg1-xGa2O4:Co2+(0≤x≤1.0)晶体的晶格常数与掺杂比例x之间存在比较好的线性关系。合成的晶体结晶度高,排列较规整。发射光谱的形状和位置分析表明,可见光区670 nm附近的强发射峰源于四面体位中Co2+的4T1(4P)→4A2(4F)能级跃迁;近红外区的弱发射峰源于四面体位中Co2+的4T1(4P)→4T2(4F)能级跃迁。

Synthesis of ZnxMg1-xGa2O4:Co2+by low temperature combustion method

We successfully acquire a series of ZnxMg1-xGa2O4:Co2+( x=0,0.25, 0.5, 0.75 and 1.0) compound spinel through low temperature combustion with Zn(NO3)2·6H2O, Mg(NO3)2·4H2O, Ga(NO3)3·6H2O, CO(NH2)2, NH4NO3, and Co(NO3)2·6H2O as raw materials. We further analyze their characteristics by X ray diffractometer, transmission electron microscope, and F 4500 fluorospectrophotometer. Results reveal that these products are not simple mixture of MgGa2O4 and ZnGa2O4, a new solid solution material. A better linear relationship exists between the lattice constant of ZnxMg1-xGa2O4:Co2+(0 ≤x≤ 1.0) crystals and doping density x. Synthesized crystals have high crystallinity with neater array. Form and position analysis of emission spectrum show that the strong emission peak near the visible region (670 nm) is attributed to energy level transition (4T1(4P) → 4A2(4F)) of Co2+ in the tetrahedron. The weak emission peak near the infrared region is attributed to energy level transition (4T1(4P) →4T2(4F) of Co2+ in the tetrahedron.