低掺杂La_(0.82)Sr_(0.18)MnO_3巨磁电阻块材的低频内耗  

LOW FREQUENCY INTERNAL FRICTION OF LOW DOPED La0.82Sr0.18MnO3 COLOSSAL MAGNETORESISTANCE BULK MATERIALS

作　　者：李合琴[1] 陈志宝[1] 方前锋[2] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]中国科学院固体物理研究所内耗与固体缺陷实验室,合肥230031

出　　处：《金属学报》2003年第11期1170-1172,共3页Acta Metallurgica Sinica

基　　金：安徽省自然科学基金资助项目03044703

摘　　要：用低频扭摆法测试了低掺杂La0.82Sr0.18MnO3巨磁电阻块材的内耗及弹性模量.所测试的温度范围内,在276和 154 K存在两个内耗峰,且在相应的温度,模量有明显的变化.结合电磁性能的测试结果,认为高温峰起源于顺磁绝缘体斜方相向 铁磁金属斜方相的转变.低温峰则被解释为铁磁金属斜方相向铁磁金属正方相的转变.The low frequency internal friction and elastic modulus, together with the electrical and magnetic properties are measured for the La0.82Sr0.18MnO3 colossal magnetoresistance bulk materials. Two internal friction peaks and the corresponding softening of elastic modulus and two resistance peaks are observed around 276 and 154 K. The peaks at high temperature can be ascribed to the PIR to FMR transition, while the peaks at low temperature may be interpreted as a phase transition from FMR to FMO.

关 键 词：内耗 巨磁电阻 电磁性能 相变 La0.82Sr0.18MnO3 

分 类 号：TQ134.11[化学工程—无机化工] TG113.226[金属学及工艺—物理冶金]