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采用改进的丙烯酰胺聚合凝胶法制备YMnO3纳米颗粒。通过加入丙烯酰胺使Y和Mn的无机盐水溶液成胶,在溶液成胶过程中,丙烯酰胺聚合形成高分子网络骨架,为粒子提供生长的空间。利用X射线衍射、热重分析、差示扫描量热分析及红外光谱等多种手段研究干凝胶的热分解及YMnO3的形成过程,结果表明:在800℃煅烧可获得高纯的YMnO3粉体,比固相反应法合成YMnO3降低了近300℃。扫描电镜观察显示:制得的YMnO3粉体的粒度分布均匀,颗粒呈类球形。磁滞回线测量结果表明:YMnO3纳米颗粒在室温具有微弱的铁磁性,这是其陶瓷样品所不具有的。
YMnO3 nanoparticles were prepared by the modified acrylamide polymerization gel method. By adding acrylamide to Y and Mn inorganic salt aqueous solution into a gel, in the process of gel solution, acrylamide polymerization to form polymer network framework for the particles to provide space for growth. The pyrolysis of xerogel and the formation of YMnO3 were studied by means of X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry and infrared spectroscopy. The results show that high purity YMnO3 powder can be obtained by calcination at 800 ℃ , Which is lower than that of YMnO3 synthesized by solid-state reaction method by nearly 300 ℃. Scanning electron microscopy showed that the particle size of YMnO3 powder was uniform and the particles were spherical. Hysteresis loop measurements show that the YMnO3 nanoparticles have weak ferromagnetism at room temperature, which is not found in the ceramic samples.