摘要
用传统的电子陶瓷工艺制备了Ｌａ１－ｘＣａｘＭｎＯ３（ｘ＝０．１５，０．３，０．４，０．５，０．６７，０．７）的系列多晶样品，测量了样品的直流电阻率随温度（４３００Ｋ）、磁场的变化（０８Ｔ）．结果表明：ｘ＝０．３的样品具有最好的磁阻效应，ｘ＝０．１５，０６７的样品在测量范围内没有巨磁阻效应，但ｘ＝０．７的样品出现较弱的巨磁阻效应，其金属半导体转变温度为１０５Ｋ．
La 1- x Ca x MnO 3 ( x =0.15,0.3,0.4,0.5,0.67,0.7) series polycrystalline samples are prepared by the traditional electronic ceramic technique. The D.C. resistances of the samples are measured as functions of temperature (4￣300 K) and magnetic field (0￣8 T) and the magnetoresistances for different samples are obtained. The results show that the sample with x =0.3 possesses the best magnetoresistance effect, samples of x =0.15 and x =0.67 have no such effect, and for x =0.7, a weak magnetoresistance effect is observed with its metal semiconductor transition around T =105 K.
出处
《扬州大学学报（自然科学版）》
CAS
CSCD
1998年第2期52-54,共3页
Journal of Yangzhou University：Natural Science Edition
基金
扬州大学自然科学基金
关键词
钙钛矿型
巨磁阻材料
多晶材料
LaCaMnO
lanthanum oxide+calcium oxide+manganese oxide+double oxides
polycrystals
magnetoresistive effect
