硅酸盐学报

低温燃烧合成铬酸镧纳米粉体的结构特性

作者：刘伟明李静李胜利李士刚朱新德李洪

单位：山东大学材料科学与工程学院山东大学材料科学与工程学院山东大学材料科学与工程学院山东大学材料科学与工程学院山东大学材料科学与工程学院烟台市产品质量监督检验所济南250061烟台市产品质量监督检验所山东烟台264001 济南250061 济南250061 济南250061 济南250061 山东烟台264001

关键词：铬酸镧低温燃烧合成粉体微结构

分类号：TB383.1

出版年,卷(期):页码：2006,34(10):1279-1282

DOI：

摘要：

用低温燃烧合成法合成了铬酸镧纳米粉体。X射线衍射和扫描电镜分析的结果表明:粉体由La1-xCaxCrO3和少量的LaCrO4,La2CrO6和有机物组成。合成过程形成的中间相LaCrO4是凝胶分解反应不完全的结果,La2CrO6的形成与阳离子未完全络合有关。燃烧后的产物呈薄膜状,厚度约80nm;高温煅烧时薄膜状产物中的有机物挥发和LaCrO4,La2CrO6分解导致薄膜发生破碎,并形成粒径约80nm的粉体。煅烧后粉体尺寸均匀,但部分颗粒间存在硬团聚。

Nano-powder of lanthanum chromites were synthesized by low-temperature combustion method.The powders were com-posed of La1-xCaxCrO3,a little of LaCrO4,La2CrO6 and organic compounds measured by X-ray diffraction and scanning electron mi-croscopy analysis.The phase of LaCrO4,as an inter-phase,was resulted from incomplete decomposition of the gel,and the formation of La2CrO6 was related to incomplete complexation of cations.The products synthesized are as a film-like material with thickness about 80 nm.During the film calcined at high temperature,volatilization of organic compounds and the decomposition of LaCrO4 and La2CrO6 lead to the film broken into the nano powders with average particle size about 80 nm.The powders synthesized are uniform in size,but there are partially hard particle agglomerates in the powders.

基金项目：

高等学校博士学科点专项科研基金(20050422026);; 国家自然科学基金(50362001)资助项目

作者简介：

参考文献：

[1]SAKAI N,KAWADA T,YOKOKAWA H,et al.Liquid-phase-assisted sinter of calcium-doped lanthanum chromites[J].J Am Ceram Soc,1995,76(3):609-616. [2]BOROOMAND F,WESSEL E,BAUSINGER H,et al.Correlation between defect and expansion during reduction of doped LaCrO3inter-connects for SOFCs[J].Solid State Ionics,2000,129(1-4):251-258. [3]YAKABE H,HISHINUMA M,YASUDA I.Static and transient model analysis on expansion of LaCrO3under an oxygen potential gradient[J].J Electrochem Soc,2000,147(11):4071-4077. [4]TIMOTHY R A,JEFFRY W S,LARRY K R P,et al.Dimensional instability of doped lanthanum chromite[J].J Electrochem Soc,1996,143(9):2919-2925. [5]娄向东,田圣军,姜聚慧.含镧钙钛矿型复合氧化物的制备方法评介[J].郑州轻工学院学报(自然科学版),2000,15(4):84-86.LOU Xiangdong,TIAN Shengjun,JIANG Juhui.J Zhengzhou Ins Light Ind(Nat Sci,in Chinese),2000,15(4):84-86. [6]AZEGAMI K,YOSHINAKA M,HIROTA K,et al.Formation and sintering of LaCrO3prepared by the hydrazine method[J].Mater Res Bull,1998,33(2):341-348. [7]CHAKRABORTY A,BASU R N,MAITI H S.Low temperature sin-tering of La(Ca)CrO3prepared by an autoignition process[J].Mater Lett,2000,45(9):162-166. [8]MORI M,SAMMES N M.Sintering and thermal expansion charac-terization of Al-doped and Co-doped lanthanum strontium chromites synthesized by the Pechini method[J].Solid State Ionics,2002,146(3-4):301-312. [9]ZUPAN K,KOLAR D,MARINSEK M.Influence of citrate-nitrate reaction mixture packing on ceramic powder properties[J].J Power Sources,2000,86(1-2):417-422. [10]PATHAK L C,SINGH T B,DAS S,et al.Effect of pH on the combus-tion synthesis of nano-crystalline alumina powder[J].Mater Lett,2002,57(2):382-385. [11]FURUSAKI A,KONNO H,FURUICHI R.Pyrolytic process of La(Ⅲ)-Cr(Ⅵ)precursor for perovskite type lanthanum chromium ox-ide[J].Thermochimi Acta,1995,253:253-264. [12]NAKAYAMA S,SAKAMOTO M.Preparation of perovskite-type oxide,LaCrO3,by thermal decomposition of La[Cr(CH2(COO)2)3]6H2O[J].Ceram Soc Jpn J,1992,100(1159):342-345.

服务与反馈：

【文章下载】【加入收藏】