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用固相反应法制备了La0 .5-xYxBa0 .5CoO3多晶材料 ,系统研究了Y的替代对材料磁性和输运特性的影响 ,结果发现 ,Y的掺入主要产生了两种效应 ,一是Y向Co的 3d轨道产生了电荷转移 ,使分子磁矩下降 ,二是出现了Co离子的反铁磁交换作用 ,当Y含量少于或等于 0 .3时 ,材料中出现了自旋的非共线结构。当Y含量大于 0 .3时 ,材料从铁磁态为主转变为反铁磁态为主。对不同Y含量的材料 ,其导电机制都属于极化子的变程跳跃导电 ,随Y含量增加 ,材料电阻率迅速增大。
The La0.5-xYxBa0.5CoO3 polycrystalline material was prepared by the solid-state reaction method. The effects of Y substitution on the magnetic and transport properties of the material were systematically studied. It was found that Y incorporation mainly produced two kinds of effects Y to Co 3d orbit generated charge transfer, the molecular magnetic moment down, the second is the antiferromagnetic exchange of Co ions, when the Y content is less than or equal to 0.3, the material appeared spin non- Collinear structure. When the Y content is greater than 0.3, the material mainly changes from the ferromagnetic state to the antiferromagnetic state. For materials with different content of Y, the conductive mechanism belongs to the variable-jump conductance of the polaron. With the increase of Y content, the material resistivity increases rapidly.