中文摘要：

采用低温固相反应法制备前驱体,经煅烧获得YMn2O5纳米粉体。用Fourier红外（FTIR）光谱仪和热重/差示扫描量热法分析前驱体的组成和热分解过程,用X-射线衍射仪和透射电子显微镜分析合成粉体的物相组成和形貌,并研究其磁学性能及磁性离子的价态分布。结果表明：经800℃煅烧可获得较纯的YMn2O5纳米粉体,尺寸约为40~50 nm。该粉体在低温下以反铁磁有序为主,同时呈现出弱的铁磁性,二者相互竞争,导致团簇玻璃态行为产生。粉体中不均一的磁结构主要归因于Mn3＋/Mn4＋的混价结构。

英文摘要：

YMn2O5 nano-powders were synthesized via calcining the precursor prepared by low-temperature solid state reaction. The composition and the thermo-decomposing process of the precursor were investigated by Fourier transform infrared spectrometer and therrnogravirnetry-differential scanning calorimeter, respectively. The phase constitution and morphology of YMn2O5 powders were characterized by X-ray diffracometer and transmission electron microscope, respectively.The magnetic properties of the prepared YMn2O5 powders and valence distribution of magnetic ions were also investigated. The results show that relatively pure YMnzO5 nano-powders can be synthesized after calcining at 800℃. The size of the obtained YMn2O5 nano-powders is approximately 40-50 nm. The predominantly antiferromagnetic order with weak ferromagnetic properties co-exist at a low temperature. The competition between ferromagnetic and antiferromagnetic interactions leads to the presence of the cluster glass state behavior. The inhomogeneity magnetic structures in the powders are related to the mixed valence structure of Mn3＋/Mn4＋ ions.