论文部分内容阅读
采用溶胶-凝胶的方法制备了Bi0.75Sr0.25MnO3化合物,并对其结构、磁性质、铁电性进行了研究。X射线衍射结果显示样品为单相钙钛矿结构,电阻率和差热实验证实了样品在590K的温度附近发生了电荷有序相变。磁性质测量表明样品在低温下(5K)为铁磁性。电滞回线测量显示样品在室温下最大的剩余极化强度Pr为4.47×10-3μC/cm2。分析表明:样品中的多铁性来源于Bi3+的6s2孤对电子和电荷有序相变导致的晶格畸变效应。
The Bi0.75Sr0.25MnO3 compound was prepared by sol-gel method and its structure, magnetic properties and ferroelectricity were studied. X-ray diffraction results show that the sample is a single-phase perovskite structure, the resistivity and differential thermal experiments confirmed that the samples in the vicinity of the temperature of 590K charge-order phase transition occurred. Magnetic measurements show that the sample is ferromagnetic at low temperature (5K). The hysteresis loop measurement showed that the maximum remanent polarization Pr of the sample at room temperature was 4.47 × 10-3μC / cm2. The analysis shows that the multiferroic in the sample is derived from the lattice distortion effect caused by 6s2 lone pair electrons and charge orderly phase transition of Bi3 +.