Doping influence on the stability of YMnO3 orthorhombic perovskite obtained by mechanosynthesis
Doping influence on the stability of YMnO3 orthorhombic perovskite obtained by mechanosynthesis
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DOI：
10.1016/j.matchemphys.2012.01.087
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发表时间：
2012-04
影响因子：
4.6
通讯作者：
A. Moure;T. Hungría;A. Castro;J. Galy;O. Peña;J. Tartaj;C. Moure
中科院分区：
文献类型：
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作者：
A. Moure;T. Hungría;A. Castro;J. Galy;O. Peña;J. Tartaj;C. Moure
采用机械合成法在行星式球磨机中从氧化物混合物中制备了YMn 1-xNixO 3和YMn 1-xCoxO 3（x=0，0.05，0.10，0.15）正交钙钛矿固溶体。该方法避免了制备小离子半径稀土锰氧化物常用的高压高温路线。由研磨提供的高能量诱导了由于Jahn-Teller效应而具有高畸变的钙钛矿氧化物的合成。结构随温度的稳定性随着少量Ni而增加，证明Jahn-Teller效应的影响比容差因子对钙钛矿多晶型物的稳定性的影响更重要。这种稳定性不能通过Co取代来实现，因为这种掺杂在Mn 4+、非Jahn-Teller阳离子的形成中不是那么有效。进行磁性研究以确定通过该路线获得的材料的性质。
Orthorhombic perovskite solid solutions with YMn1−xNixO3and YMn1−xCoxO3compositions (x=0, 0.05, 0.10, 0.15) have been prepared by mechanosynthesis from a mixture of oxides in a planetary mill. This method allows the use of high-pressure and high-temperature route to be avoided, which is the habitual method to prepare rare-earth manganites with small ionic radius. The high energy supplied by the milling induces the synthesis of the perovskite oxides with a high distortion due to the Jahn–Teller effect. The stability of the structure with temperature is increased with small amounts of Ni proving that the influence of the Jahn–Teller effect is more important than that of the tolerance factor on the stability of the perovskite polymorph. Such stability is not achieved by Co substitution, as this doping is not so efficient in the formation of Mn4+, non-Jahn–Teller cations. Magnetic studies were carried out to determine the properties of the materials obtained by this route.