摘要
用混合硝酸盐分解法和柠檬酸络合法分别制取了单一钙铁矿型多晶粉末LaNiO_3和LaMnO_3.XRD 分析表明LaNiO_3的形成经历了混合氧化物转化为LaNiO_3的同相反应;而LaMnO_3晶相直接由无定形相转化而来。根据DTA、TG、IR 分析两者的形成,NO_3^-离子都起了重要作用.同时讨论了络合剂柠檬酸的作用.
Single phase perovskite-type oxides,polycrystal powder LaNiO_3 and LaMnO_3,have been prepared by decomposing mixed nitrates and citric acid compexing methodsrespectively.X-ray powder diffraction analysis showed that the formation of LaNiO_3was caused by a solid reaction in which mixed oxides were converted into LaNiO_3;while LaMnO_3 was growing out of amorphous substance directly.By DTA,TG andIR etc.measurements,it was found that ion NO_3-took part in the formation ofLaNiO_3 and LaMnO_3.At the same time,the function of the complexing agent wasdiscussed.Citric acid favors fomation of single phase pevovskite-type oxides,especially in the case of LaMnO_3.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1993年第3期382-385,共4页
Acta Physico-Chimica Sinica
基金
内蒙古教育科学基金
关键词
镍酸镧
锰酸镧
钙钛矿型
晶体
LaNiO_3,LaMnO_3
Peovskite-type crystal
X-ray powder diffraction
Thermoanalysis
