ZnMnO_3及LaZnMnO_3的制备及结构特性

Preparation and Structure Properties of ZnMnO_3 and LaZnMnO_3

对ZnO与MnO2固相反应进行研究，当烧结温度超过1300℃和烧结时间超过12h，ZnO与MnO2固相反应生成ZnMnO3的四面体结构。对La（1-x）ZnxMnO3材料的制备条件进行研究，对结构进行表征。研究结果表明，固相反应只与烧结温度和烧结时间有关，与压制压力没有太大关系。当烧结温度超过1300℃和烧结时间超过6h，X射线衍射谱表明都具有钙钛矿衍射峰，但掺杂浓度在50％～70％时有新的衍射峰，可能产生了新相，有待进一步深入研究。

The preparation and structural properties of ZnMnO3 and La（1-x）ZnxMnO3 were investigated. The results indicate that ZnO react MnO2 to form ZnMnO3 spinel structure above 1300℃ and 12h. Solid-state reaction is closely related to sintering temperature and time. La（1-x）ZnxMnO3 was prepared by solid reaction of ZnO, MnO2 and La2O3 with different ZnO concentrations. X-ray diffraction patterns shows that La（1-x）ZnxMnO3 has perovskite structure when sintering temperature and time exceeds 1300℃ and 12h,respectively. The concentration is between 50% to 70% , a few new diffraction peaks appear, which indicates a new phase probably formed, further study is necessary to investigate the new phase and magnetoresistance effect.