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Formation of U-type hexaferrites

机译：U型六方铁氧体的形成

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摘要

The formation of U-type hexaferrites with the composition Ba_4B_2Fe_(36)O_(60) (B = Co, Ni, Zn) was studied. Samples were characterized by means of x-ray diffraction, electron microscopy (with energy-dispersive spectroscopy), and thermogravimetric and thermomagnetic analyses. U-hexaferrites are formed from the intermediate phases M-hexaferrite (BaFe_(12)O_(19)) and Y-hexaferrite (Ba_2B_2Fe_(12)O_(22)), which at the same time represent units in the U-hexaferrites' crystal structure. The preparation of monophase U-hexaferrites was made possible by combining high-energy milling or chemical coprecipitation with a calcination at 1250-1300 deg C. Structural defects, such as stacking faults, were observed in monophase samples with a high-resolution transmission electron microscope. The observed defects can be regarded as seeds for the formation of other hexaferrite phases after prolonged calcination times or higher calcination temperatures.
机译：研究了组成为Ba_4B_2Fe_（36）O_（60）（B = Co，Ni，Zn）的U型六方铁氧体的形成。样品通过X射线衍射，电子显微镜（具有能量色散光谱）以及热重和热磁分析进行表征。 U-六铁氧体由中间相M-六铁氧体（BaFe_（12）O_（19））和Y-六铁氧体（Ba_2B_2Fe_（12）O_（22））形成，它们同时表示U-六铁氧体中的单位晶体结构。通过将高能研磨或化学共沉淀与1250-1300℃的煅烧相结合，可以制备单相U-六价铁氧体。使用高分辨率透射电子显微镜在单相样品中观察到结构缺陷，例如堆垛层错。在延长的煅烧时间或更高的煅烧温度后，观察到的缺陷可以视为形成其他六价铁氧体相的种子。

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