【摘要】 Mn位掺杂是调整稀土锰氧化物中Mn3+和Mn4+比例的一种十分有效的方法,对理解稀土锰氧化物材料的微观机理具有重要作用.采用标准的固相反应方法制备了钙钛矿锰氧化物LaMn1-xZnxO3(x=0.03,0.05,0.1,0.15,0.2)多晶样品.通过X射线衍射仪(XRD)、光电子能谱(XPS)对其结构及性质进行了测试.结果表明,随着Zn掺杂量的增加样品的晶胞体积逐渐变大;样品的衍射峰略向高角度偏移,但所有样品的结构仍为正交结构.Zn的掺杂比例不同不仅导致样品中氧含量发生变化并且使Mn4+/Mn3+的比增大,当x=0.2时,Mn4+/Mn3+的比最大(1.94:1),双交换作用最强.更多还原

【Abstract】 An effective way to modify the crucial Mn4+/Mn3+ proportion is to dope at the Mn sites,which are important to understand the micro-mechanism of perovskite manganite.Manganite perovskite polycrystalline samples of LaMn1-xZnxO3(x=0.03,0.05,0.1,0.15,0.2(LMZO)) were prepared by standard solid phase reaction method.Structure and properties of the samples were tested by X-ray diffraction(XRD) and photoelectron spectroscopy(XPS).The results show that with the increase of Zn-doped content the cell volume of the sample gradually becomes larger and the sample diffraction peaks slightly shift to the high angle,but the structure of all samples is still the orthorhombic structure.Different proportion of Zn doping not only leads to change the oxygen content of the samples and increases Mn4+/Mn3+ ratio.When x = 0.2 the Mn4+/Mn3+ ratio reachs the maximum(1.94:1);and double-exchange interaction is the strongest.更多还原