钙钛矿La_(0.7)Pb_(0.3)MnO_3的结构和磁性研究  

Structure and magnetic properties of perovsktie La_(0.7)Pb_(0.3)MnO_3

作　　者：雒向东[1] 韩立安[2] 朱金山[2] 

机构地区：[1]兰州城市学院物理系,甘肃兰州730070 [2]西安科技大学基础课部,陕西西安710054

出　　处：《西安科技大学学报》2006年第2期283-285,共3页Journal of Xi’an University of Science and Technology

摘　　要：采用固相反应烧结法成功制备了单相多晶样品La0.7Pb0.3MnO3,用X射线衍射和超导量子干涉仪及振动样品磁强计对其结构和磁性进行了研究。结果表明,样品呈菱面相晶体结构,空间群为R-3C,居里温度Tc=348 K,在居里温度附近,发生铁磁-顺磁转变。此材料呈现出一种典型的团簇玻璃特性,其阻截温度为336 K,并且对零场冷却和场冷却曲线给出了合理的解释。室温下,其矫顽力只有40 Oe。Single phase polycrystalline sample La0.7 Pb0.3MnOa is successfully fabricated by conventional solid state reaction. The crystal structure and magnetic properties are investigated. The result of the room temperature X-ray Powder diffraction is rhombohedral structure with space group R-3C, the curie temperature is 348 K. Near the curie temperature, the magnetic property shows a transition from ferromagnetic to paramagnetic. La0.7Pb0.3MnO3 indicates a characteristic cluster glass from Zero-field cooled and field cooled magnetization curve, a reasonable explanation was provided to show the phenomena. The coercive force of the sample is only 40 Oe at the room temperature.

关 键 词：磁性 La0.7 Pbo.3 MNO3 钙钛矿 

分 类 号：TM27[一般工业技术—材料科学与工程]