固-固化学法制备Ce_(0.75)Zr_(0.25)O_2氧化物固溶体及其表征

Preparation and Its Characterization of Nanometer Ce_(0.75)Zr_(0.25)O_2 by Solid-solid State Chemical Reaction Method

以碳酸铈、氯氧锆和草酸为原料,采用机械力活化固-固化学法制得前驱物,前驱物经热分解获得了相应的目标产物Ce0.75Zr0.25O2氧化物固溶体.对前驱体进行了热重-差热(TG-DTA)测试,分析了在球磨及煅烧过程中可能发生的化学反应.采用X-射线衍射(XRD),透射电镜(TEM)和光电子能谱(XPS)等对产物进行了表征,实验结果表明:产物为单一的立方晶系固溶体,没有单独的氧化锆或氧化铈存在,粉体分散性好,呈圆球状,分布均匀,平均粒径为15.8 nm,比表面积达85.4 m2/g.对机械力活化固相化学反应的机制进行了研究.

Nanometer Ce0.75Zr0.25O2 solid solution was obtained by thermal decomposition of the precursor, which was prepared by solid-solid chemical reaction method with Ce2 （CO）3, ZrOCl2 8H2O and H2C2O4 2H2O as raw materials under the action of mechanical power. The mechanism of reactions in the ball milling was researched. Through TG-DTA investigation of the precursor, the possibly chemical reactions during the synthesis process were determined. The characterizations of Nanometer Ce0. 75 Zr0. 25 O2 solid solution by XRD, TEM, XPS and BET showed that it was single-cubic-phase, its particles were spherical shape with the average particles size 15.8 nm, and the specific surface area was 85.4 m^2/g.