Mn掺杂对BaSn1-xMnxO3体系结构、光学和磁学性质的影响

利用传统的固相反应法制备了BaSn1-xMnxO3(x=0,0.05,0.10和0.13)多晶样品,系统研究了不同Mn掺杂量对BaSnO3样品的结构、光学及磁学性质的影响.通过X射线衍射分析表明此掺杂化合物形成了具有钙钛矿结构的单相,在掺杂范围内没有观察到第二相出现.漫反射光谱测试分析发现随着Mn掺杂浓度的增加,其光学吸收边红移并逐渐平缓化,拉曼光谱测试表明拉曼振动模式也发生了变化,进一步证明Mn离子取代了Sn位.磁场下的光致发光谱测试表明样品在近红外区的发光可能与Sn离子有关.磁学测量则显示样品在低温具有一定铁磁性,其来源可用F心交换机制来解释.

Mn-doping effects on structural, optical and magnetic properties of BaSn1-xMnxO3

Polycrystalline bulk samples of BaSn_1-xMn_xO₃ with x=0, 0.05, 0.10 and 0.13 are prepared by the conventional solid state reaction method. The effects of Mn concentration on crystal structural, optical and magnetic properties of BaSn_1-xMn_xO₃ are investigated systematically. Powder X-ray diffraction (XRD) shows that each of these compounds presens a perovskite structure (with the space group Pm3m) without the secondary crystalline phase. The Mn ions take the Sn sites which is revealed by the XRD, diffusion reflectance spectrum (DRS) and Raman scattering. With the increase of doping level x, the optical absorption edge shifts towards higher wavelength and is smoothened gradually, meanwhile the Raman spectrum shows that Raman mode is also changed. The photoluminescence spectrum under magnetic field shows that near-infrared luminescence is probably related to Sn ions. The magnetization measurement demonstrates that Mn-doped BaSnO₃ system exhibits ferromagnetism at low temperature, which can be explained by the F-center exchange (FCE) mechanism.