摘要
通过测量La1-xNaxMnO3(x=0.05,0.10,0.15,0.20,0.25,0.33)体系的M-T曲线和R-T曲线,研究了La位Na掺杂对体系磁电性质的影响。结果发现:随着Na掺杂浓度的增加,体系居里温度TC升高,顺磁-铁磁相变逐渐变陡;伴随着顺磁-铁磁相变,体系发生金属-绝缘体相变,电阻随掺杂浓度增加而下降。体系磁电性质的变化来源于掺杂引起的Mn3+-O-Mn4+间的双交换作用、静态Jahn-Teller畸变和公差因子的变化。
By measuring M-T curves and R-T curves of the samples Lat-xNaxMnO3 （x=0.05, 0.10, 0.15, 0.20, 0. 25, 0.33）, the influence of Na doping at La site on the magneto-electric properties was investigated. Our experiment results shows that, Curie temperature Tc increases and paramagnetic-ferromagnetic transition becomes steeper with increasing of Na content; All samples exhibit a paramagnetic-ferromagnetic transition associated with metal-insulator transition whereas the values of resistance decrease with the doping concentration increasing. The change of the magneto-electric properties originates from double- exchange function in Mn^3＋-O-Mn^4＋and static Jahn-Teller distortion as well as the change of tolerance factor caused by the doping concentration increasing.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第11期1887-1892,共6页
Rare Metal Materials and Engineering
基金
supported by the National Science Foundation of China(19934003)
the State Key Project of Fundamental Research ofChina(001CB610604)
the Nature Science Foundation of the Anhui Higher Education Institutions of China(2006KJ266B,ZD2007003-1)
