钙钛矿型Gd_(1-x)Dy_xMnO_3(0≤x≤1)的水热合成及磁性表征

Hydrothermal synthesis and magnetic properties of Gd_(1-x)Dy_xMnO_3(0≤x≤1)

通过环境友好的水热法制备了钙钛矿型稀土锰酸盐Gd1-xDyxMnO3(0≤x≤1),该系列化合物具有正交结构(属于pbnm空间群)。在合成反应中,Mn(OH)2在强碱体系下被空气中O2氧化生成包含Mn3+的反应前驱物;锰酸盐的晶体生长、反应温度和碱度对其有明显的影响。磁性表征结果显示Dy3+对Gd3+的取代引起了化合物低温磁有序的竞争。

The well crystallized perovskite type Gd1-xDyxMnO3 （O≤x≤l） are prepared by an environment friendly hydrothermal approach, where Mn^3＋ containing precursors are prepared by oxidation of Mn（OH）2 in air, instead of KMnO4 or H2O2, and the series compounds are found to adopt orthorhombic structure （ space group pbnm）. Crystal growth of the rare earth manganites is sensitive to alkalinity and temperature. The variable temperature magnetizations show that the substitution of Gd^3＋ by Dy^3＋ causes the competition of the mag netic ordering structure at low temperature.