排序方式: 共有63条查询结果,搜索用时 0 毫秒
61.
We have performed magnetization measurements and electron spin resonance (ESR) on polycrystalline manganites of Nd0.5Sr0.5-xBaxMnO3 (x = 0.1). Phase separation and phase transitions are observed from the susceptibility and the ESR spectra data. Between 260 K (~ Tc) and 185 K (~ TN), the system coexists of the paramagnetic phase and the ferromagnetic (FM) phase. Between 185 K and 140 K, the system coexists of the FM phase and the antiferromagnetic (AFM) phase. These results indicate that the system has a very complex magnetic state due to the origin of the instability stemming from manganite Nd0.5Sr0.4Ba0.1MnO3 by partially substituting the larger Ba^2+ ions for the smaller Sr^2+ ions. 相似文献
62.
63.
本文通过传统的固相反应方法制备了双钙钛矿氧化物系列样品 Dy2 -xEuxCoMnO6 (x =0,0.1 ,0.3) . 利用对该系列样品的 XRD 谱线、 磁化强度随温度的变化曲线(M-T ) 、 等温磁化曲线(M-H ) 的测量, 研究了随着Eu 掺杂对类 Griffiths 相、 磁熵变等的影响. 研究表明, 双层钙钛矿氧化物 Dy2 -xEuxCoMnO6 (x =0,0.1 ,0.3) 系列样品均显示出良好的单相性; 样品在T >TG 和T 相似文献