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 La1-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 Mn3+-O-Mn4+and static Jahn-Teller distortion as well as the change of tolerance factor caused by the doping concentration increasing.
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