A New Low-Temperature Preparetion Method of Highly Homogeneous Mixed Oxides from d-f Heteronuclear Complex Precursors

d-f异核配合物前驱体低温制备高均质混合氧化物的新方法

基本信息

批准号：
13640552
负责人：
SAKAMOTO Masatomi
金额：
$ 2.24万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

The purpose of this work is to propose a new preparation method of mixed oxides from the heteronuclear complexes, mainly using the d-f heteronuclear systems. Homogeneous mixed oxides in an atomic level with high specific area are expected by this method.Single phase of perovskite-type oxide LaCoO_3 was formed by the thermal decomposition of La[Co(CN)_6]・5H_2O and La[Co(ox)_3]・8.5H_2O at 600℃, where these complexes have a three dimensional network structure constructed by the cyanide and oxalate bridges, respectively, between La and Co ions. This formation temperature is much lower than that (1000℃) for the conventional ceramic method. The EPMA results showed that the LaCoO_3 prepared from the heteronuclear complexes was highly homogeneous.Decomposition of Bi_<0.5>La_<0.5>[Fe(CN)_6]・4H_2O and [La_2Cu(C_4O_4)(H_2O)_<16>]・2H_2O led to the formation of Bi_<0.5>La_<0.5>FeO_3 and La_2CuO_4 at 500 and 700℃, respectively, where H_2C_4O_4 is squaric acid.Perovskite-type oxide LaNiO_3 was formed by the decomposition of heterodinuclear complex LaNi(dhbaen)(NO_3)(H_2O)_2 in the range of 600 to 900℃, where H_4dhbaen is N,N'-bis(3-hydroxysalicylidene)ethylenediamine. However, LaNiO_3 was not obtained even at 1000℃ when the (1:2) mixture of La_2O_3 and NiO was calcined.Thus, heteronuclear complexes were found to be very superior as precursors of mixed oxides.

这项工作的目的是提出一种从异核复合物中的混合氧化物的新制备方法，主要是使用D-F异核系统。通过这种方法，预期的是在原子水平上具有很高特异性面积的同质混合氧化物。钙钛矿型氧化物的单个阶段是通过LA [CO（CN）_6] ・5H_2O和LA [CO（CO（OX）_3] _3. 8.5H_2O的600 cyan and cyers Anement Anement Anement Anement Anterions Antrentions的热量分解形成的。草酸桥分别在LA和COIONS之间。对于常规陶瓷方法，该地层温度远低于（1000℃）。 EPMA结果表明，从异核络合物制备的LACOO_3高度同质。bi_ <0.5> la__ <0.5> [fe（cn）_6] ・4H_2O和[la_2cu（la_4o_4）（c_4o_4）（h_2o）____________________________的3.5 0.5.5.5.5.5.5.5.5.5.50.5。 and La_2CuO_4 at 500 and 700℃, respectively, where H_2C_4O_4 is square acid.Perovskite-type oxide LaNiO_3 was formed by the decomposition of heterodinuclear complex LaNi(dhbaen)(NO_3)(H_2O)_2 in the range of 600 to 900℃, where H_4dhbaen is n，n'bis（3-羟基甲基化的乙二胺）乙二胺。但是，即使在1000℃时，也无法获得LANIO_3，当时（1：2）LA_2O_3和NIO的混合物被钙化。因此，发现异核复合物作为混合氧化物的前体非常出色。