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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。
Abstract：A modified polyacrylamide gel route was used to fabricate YMnO3 nanoparticles.In this route,the aqueous solution of inorganic Y and Mn salt was gelled by using acrylamide;during the gelation process,acrylamide was polymerized to form a polymer network,which provided a structural framework for the growth of particles.The X-ray diffraction,thermogravimetric analysis,differential scanning calorimetry analysis,and Fourier transform infrared spectroscopy were used in combination to investigate the thermal decomposition process of xerogel and the formation of YMnO3 phase.It is demonstrated that high-purity YMnO3 powders can be prepared at a calcining temperature of 800 ℃,which is nearly 300 ℃ lower than the synthesis temperature based on the solid-state reaction method.The scanning electron microscopy observation reveals that the prepared YMnO3 powder has a uniform particle size,and the particles are almost spherical.The magnetic hysteresis loop measurement shows that YMnO3 nanoparticles exhibit weak ferromagnetism at room temperature,which is different from the magnetic property of bulk samples.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2010.12.020
中图分类号:TB383.1
引用信息:
[1]王仕发,杨华,县涛等.YMnO_3纳米颗粒的制备与表征[J].硅酸盐学报,2010,38(12):2303-2307.DOI:10.14062/j.issn.0454-5648.2010.12.020.
基金信息:
国家自然科学基金(50962009);; 教育部重点(209130);; 甘肃省自然科学基金(1010RJZA041)资助项目