摘要
利用固相反应法合成了掺杂锂的Ｌａ１－ｘＬｉｘＭｎＯ３（ｘ＝０，０．１０，０．１５，０．２０，０．２５，０．３０）钙钛矿氧化物．ＸＲＤ测试表明，所有样品均为菱方结构．除ｘ＝０，０．３外，其它样品均随温度的降低在液氮温区可观察到从绝缘态到金属态的转变，其中ｘ＝０．１５样品的转变温度最高为１６７Ｋ．在Ｈ＝１Ｔ的磁场下，出现了负磁阻现象．ＥＰＲ谱上的ｇ＝２．
The perovskite oxides La\-\{\%1-x\%\}Li\-\%x\%MnO\-3 were prepared by solid state reactions. The XRD results indicate that all samples crystallize in rhombohedral structure. Except \%x\%=0\^0, 0\^3 ones, all samples show a transition from insulator to metal with decreasing temperature within the liquid nitrogen temperature region, where \%x\%=0\^15 sample exhibits the highest transition temperature. The negative magnetoresistance phenomena is observed at applying the magnetic field with \%H\%=1\^0 T. The EPR signal with \%g\%=2\^00 is closely related with the complex of Mn\+\{3+\}\|Mn\+\{4+\} clusters.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第4期629-633,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
中国科学院长春应用化学研究所稀土化学与物理开放实验室资助
关键词
镧
锰
锂掺杂
钙钛矿型
复合氧化物
导电性
EPR
La\-\{\%1-x\%\}Li\-\%x\%MnO\-3, EPR, Mn\+\{3+\}\|Mn\+\{4+\} clusters, Magnetoresistance
