双层锰氧化物Nd_(1.2)Sr_(1.8)Mn_2O_7的相分离研究  

Phase Separation of Bilayer Manganite Nd_(1.2)Sr_(1.8)Mn_2O_7 Polycrystalline

作　　者：邢茹[1] 鲁毅[1] 赵建军[1] 吴鸿业[1] 郑琳[1] 樊宝元[1] 周敏[2] 

机构地区：[1]内蒙古科技大学包头师范学院物理科学与技术学院,内蒙古包头014030 [2]内蒙古科技大学数理与生物工程学院,内蒙古包头014010

出　　处：《稀土》2011年第3期86-88,共3页Chinese Rare Earths

基　　金：国家自然科学基金(11064008;50862007);内蒙古自然科学基金(2009MS0101);内蒙古高校科研项目(NJ10163)

摘　　要：通过固相反应法制备成了多晶样品Nd1.2Sr1.8Mn2O7,利用XRD和SQUID研究了样品的结构和磁性。研究结果表明,该样品的单相性很好,单相结构为Sr3Ti2O7四角形结构(14/mmm)。磁性测量表明,温度高于居里温度(TC=265K),样品呈现出顺磁性,随着温度的降低出现了顺磁-铁磁的转变,铁磁与反铁磁两相共存,温度低于50 K时铁磁逐渐消失,直到完全变为反铁磁。Polycrystalline sample Nd1.2 Sr1.8 Mn207 was prepared by conventional solid state reaction method. The structure and magnetic properties have been studied with X - ray diffraction patterns and SQUID. The result indicated the sample shows no any asymmetry and no any trace of secondary phase. When the temperature is higher than Curie point（Tc =265 K） , the sample presents paramagnetic behavior. With the decrease of temperature, Ndl.2 Sr,.8 Mn2 07 undergoes the transform of paramagnetism to ferromagnetism. When the temperature is under 50 K,ferromagnctism disappears gradually and the sample exhibits antimagnetism entirely.

关 键 词：锰氧化物 相分离 电荷有序 晶格畸变 

分 类 号：O482.5[理学—固体物理] O614.33[理学—物理]