Sr掺杂对La_(0.77-x)Ca_(0.2)Sr_xMnO_3系列材料的相结构和居里温度的影响  

Effect of Sr^(2+) Dopingon Phase Structure and Curie Temperature of La_(0.7-x)Ca_(0.2)Sr_xMnO_3

作　　者：李爱君[1] 孙红辉[1] 户立春[2] 

机构地区：[1]第二炮兵工程大学物理室,陕西西安710025 [2]唐山学院基础部,河北唐山063000

出　　处：《金属功能材料》2013年第3期20-23,共4页Metallic Functional Materials

摘　　要：以存在La空位的钙钛矿材料La0.77Ca0.2MnO3为母体,用溶胶-凝胶法制备了La0.77-xCa0.2SrxMnO3(x=0.00,0.02,0.06,0.08,0.10)系列样品,研究表明,该系列材料均为单相钙钛矿结构,且随Sr2+含量的增加,该系列材料的晶格发生畸变,同时居里温度单调递增,由236K增高至300K,覆盖整个室温区,这对材料的实际应用有重要意义。Using the La-vacancy La0.77Ca0.2MnO3 as matrix materials, polycrystalline perovskites La0.77-xCa0.2SrxMnO3（x=0.00,0.02,0.06,0.08,0.10） were prepared by the sol-gel method. Experimental results showed that the materials of the series are single-phase perovskite structure. Lattice distortion occurred and Curie temperature increased monotonously from 236 K to 300 K, with increasing Sr2＋ content. It is very important for the practical application of the materials.

关 键 词：钙钛矿 相结构 居里温度 磁熵变 

分 类 号：TM27[一般工业技术—材料科学与工程]