Abstract We report a successful preparation of Ba 1−x La x Fe 2 2+ Fe 16 3+ O 27 (x = 0.00–0.10) W-type hexagonal ferrites by standard ceramic method in a reduced oxygen atmosphere. In this work, the effect of the substitution La 3+ rare-earth ions for Ba 2+ ions on the structural and magnetic properties of the prepared samples have been studied. The phase identification of magnetic powders was performed by X-ray diffraction. The results of XRD show that the single phase was observed in the W-type ferrites with different La content. The SEM micrographs showed that the ferrites have formed the hexagonal structure. The magnetic properties of the samples were metric by a vibrating sample magnetometer. The coercivity ( H c ) of the particles decreases with the increase of La content(x), while the saturation magnetization ( M s ) of the particles first increases with x from 0 to 0.05, and then begins to decrease when x continues to increase. The monotonic dependence of the magnetic anisotropy field H a and coercivity H c on the La 3+ doping amount is found to be mainly dominated by the competition between M s and K eff .

中文翻译：

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固态法制备的W型六铁氧体Ba 1−x La x Fe 2 2+ Fe 16 3+ O 27 的组织与表征

摘要 我们报道了在还原氧气氛中通过标准陶瓷方法成功制备了 Ba 1−x La x Fe 2 2+ Fe 16 3+ O 27 (x = 0.00–0.10) W 型六方铁氧体。在这项工作中，研究了用La 3+ 稀土离子替代Ba 2+ 离子对制备的样品的结构和磁性能的影响。磁粉的相鉴别通过X射线衍射进行。XRD结果表明，在不同La含量的W型铁氧体中观察到单相。SEM显微照片显示铁氧体已形成六方结构。通过振动样品磁强计测量样品的磁特性。粒子的矫顽力（Hc）随着La含量（x）的增加而降低，而颗粒的饱和磁化强度（ M s ）首先随 x 从 0 增加到 0.05，然后随着 x 继续增加而开始减小。发现磁各向异性场H a 和矫顽力H c 对La 3+ 掺杂量的单调依赖性主要由M s 和K eff 之间的竞争支配。