摘要
报道了在温和条件下巨磁阻材料La0.5Ba0.5MnO3的水热合成.系统地研究了原料配比、碱度、时间和温度对产物合成的影响,在最佳合成条件下得到了结晶度较高的纯相,并通过XRD、DTA-TG、化学分析及碘量法对产物进行了表征.该化合物属立方晶系,晶胞参数为a=0.3913nm,V=0.05990nm3,Mn的平均价态为3.5,在1T的外磁场下,磁阻比(MR)的极大值为29%.
A giant magnetoresistance material La 0.5 Ba 0.5 MnO 3 was prepared by hydrothermal method at 240 ℃ for 24 hours. The product was characterized by X ray powder diffraction, differential thermal analysis thermogravimetric analysis, chemical analysis, and iodometry. The compound crystallizes in a cubic system with cell parameters a =0.391 3 nm and V =0.059 90 nm 3 . The average valence state of manganese was 3.5, and the magnetoresistance (MR) is about 29% at 1 T.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第2期165-168,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金