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Ti-Substituted BaFe_(12)O_(19) Single Crystal Growth and Characterization

机译：Ti取代BaFe_（12）O_（19）单晶的生长与表征

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摘要

Ti-substituted barium hexaferrite BaFe12O19 single crystals Ba-Fe_(12?x)Ti_xO_(19) with x up to 1.3 and sizes 2?8 mm were grown by spontaneous crystallization from molten sodium carbonate flux. The distribution of Ti on different crystallographic sites was determined from single crystal X-ray diffraction data. For low Ti contents up to x = 0.8 the unit cell expands; on further increase of the Ti amount the unit cell starts to shrink. This behavior for low Ti contents is most likely due to a reduction of Fe~(3+) to Fe~(2+) for charge balance. At higher Ti concentrations, supposedly vacancies in the transition metal substructure are formed. An increasing Ti concentration results in a monotonous reduction of the Curie temperature from 452 to 251 °C and the saturation magnetization at room temperature from 64.8 to 24.8 emu/g for powder samples and from 70.0 to 60.1 emu/g for single crystals (for x up to 0.78).
机译：通过从熔融碳酸钠熔剂中自发结晶生长具有x最高为1.3且尺寸为2？8 mm的Ti取代的六价钡钡铁氧体BaFe12O19单晶Ba-Fe_（12？x）Ti_xO_（19）。从单晶X射线衍射数据确定Ti在不同晶体学位置上的分布。对于Ti含量低至x = 0.8的情况，晶胞会膨胀;随着钛含量的进一步增加，晶胞开始收缩。 Ti含量低的这种行为最有可能是由于电荷平衡将Fe〜（3+）还原为Fe〜（2+）。在较高的Ti浓度下，过渡金属亚结构中可能会形成空位。 Ti浓度的增加导致粉末样品的居里温度从452降至251°C单调降低，室温下的饱和磁化强度从64.8降至24.8 emu / g，单晶从70.0降至60.1 emu / g（对于x高达0.78）。

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