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利用化学沉淀法制备了Ｅｕ（ＯＨ）＿３超微粒样品，将样品在空气中于不同温度下热处理２ｈ，得到了粒度不同的Ｅｕ＿２Ｏ＿３超微粒样品，采用Ｘ射线衍射方法对Ｅｕ＿２Ｏ＿３超微粒样品粒度及点阵参数ａ进行测定，结果表明Ｅｕ＿２Ｏ＿３超微粒中存在晶格畸变．对超微粒中晶格畸变与粒度的关系进行了分析讨论．
Eu (OH) _3 ultrafine particles were prepared by chemical precipitation method. The samples were heat-treated in air at different temperatures for 2h to obtain Eu_2O_3 ultrafine particles with different particle sizes. X-ray diffraction (XRD) Array parameters a were measured, the results show that there is lattice distortion Eu_2O_3 ultrafine particles. The relationship between lattice distortion and particle size in the ultrafine particles was analyzed and discussed.