Low-temperature combustion synthesis of nanocrystalline HoFeO₃ powders via a sol-gel method using glycin

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• 作者：Linwen Jiang^a ; ^b ; Weiliang Liu^a ; ^{us.gs@163.com} ; Anhua Wu^b ; Jun Xu^b ; Qian Liu^b ; Guoxing Qian^b ; Huaijin Zhang^c
• 关键词：HoFeO3 ; G/M ; Phase forming ; Magnetic properties
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：3667-3672
• 文件大小：1225 K

摘要

Single phase nanocrystalline HoFeO₃ powders were successfully synthesized by the sol-gel self-propagation combustion method using glycin (C₂H₅NO₂) as the chelating reagent at a low combustion temperature. Four different mole ratios of glycin to metal nitrate (G/M) were used to prepare HoFeO₃ powders in the experiment. The XRD patterns indicate monophasic HoFeO₃ powders can be formed by further calcination, the SEM micrographs show that the nano-sized grains with distinguishable boundaries had been obtained. The M-H curves show HoFeO₃ powders had the characteristic of antiferromagnetism at 50 K, while the powders had the characteristic of paramagnetism as the ambient temperature reached 100 K or 300 K. The FC/ZFC magnetic measurement results demonstrate that there was a transition from antiferromagnetism to paramagnetism in HoFeO₃ nanopowders as the temperature was increased.