Expansion of the Hexagonal Phase-Forming Region of Lu1鈥?i>xScxFeO3 by Containerless Processing

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• 作者：Atsunobu Masuno ; Atsushi Ishimoto ; Chikako Moriyoshi ; Hitoshi Kawaji ; Yoshihiro Kuroiwa ; Hiroyuki Inoue
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：October 5, 2015
• 年：2015
• 卷：54
• 期：19
• 页码：9432-9437
• 全文大小：333K
• ISSN：1520-510X

文摘

Hexagonal Lu_1鈥?i>xSc_xFeO₃ (0 鈮?x 鈮?0.8) was directly solidified from an undercooled melt by containerless processing with an aerodynamic levitation furnace. The hexagonal phase-forming region was considerably extended compared to that of the conventional solid-state reaction (x 鈭?0.5). Synchrotron X-ray diffraction measurements revealed that the crystal structure of the hexagonal phase was isomorphous to hexagonal ferroelectric RMnO₃ (R = a rare earth ion) with a polar space group of P6₃cm. As x increased, the a-axis lattice constant decreased linearly, strengthening the antiferromagnetic interaction between the Fe³⁺ ions on the a鈥揵 plane. Accordingly, the weak ferromagnetic transition temperature increased from 150 K for x = 0 to 175 K for x = 0.7. These transition temperatures were much higher than those of hexagonal Lu_1鈥?i>xSc_xMnO₃. The results indicate that hexagonal Lu_1鈥?i>xSc_xFeO₃ is a suitable alternative magnetic dielectric for use at higher temperatures.