钙钛矿结构锰氧化物LaMn_(0.9)Mg_(0.1)O_3的磁熵效应  

Magnetic entropy change in perovskite-type manganese oxides LaMn_(0.9)Mg_(0.1)O_3

作　　者：张晓霞[1] 刘红艳[2] 贾艳华[3] 王淑娟[3] 肖莲萍[3] 刘允涛[3] 孔文君[3] 

机构地区：[1]吉林大学无机合成与制备国家重点实验室,吉林长春130012 [2]吉林大学测试科学实验中心,吉林长春130026 [3]吉林省第一地质调查所实验室,吉林长春130031

出　　处：《吉林地质》2007年第1期66-70,共5页Jilin Geology

摘　　要：采用传统的固相反应制备了钙钛矿结构锰氧化物L aM n0.9M g0.1O3多晶样品,并对其磁熵效应进行了研究。通过测量不同磁场下的磁化-温度曲线,发现伴随铁磁-顺磁相转变有一个大的磁熵变化,这个结果表明钙钛矿锰氧化物可以作为磁制冷技术中制冷材料。The magnetic entropy change in the perovskite-type manganese oxide LaMn0.9Mg0.1O3 is studied. Through the measurement of magnetization and temperature curves in different magnetic fields, it was found that there is a large magnetic entropy change associated with the ferromagnetic-paramagnetic transition. This result shows that perovskite manganites can be suitable candidates as working substances in magnetic refrigeration technology.

关 键 词：钙钛矿 锰氧化物 磁熵 制冷 

分 类 号：TB64[一般工业技术—制冷工程]