物理化学学报 >> 1993, Vol. 9 >> Issue (03): 382-385.doi: 10.3866/PKU.WHXB19930317

研究论文 上一篇    下一篇

钙钛矿型LaNiO3、LaMnO3的形成条件

胡瑞生; 沈岳年; 王红宇; 孙永安; 白玉山   

  1. 内蒙古大学化学系,呼和浩特 010021;内蒙古民族师院化学系,通辽 028043
  • 收稿日期:1991-12-14 修回日期:1992-09-15 发布日期:1993-06-15
  • 通讯作者: 沈岳年

Studies on Formation Conditions of Perovskite-type Oxides LaNiO3 and LaMnO3

Hu Rui-Sheng; Shen Yue-Nian; Wang Hong-Yu; Sun Yong-An; Bai Yu-Shan   

  1. Inner Mongolia University, Hohhot 010021; Inner Mongolia Teachers' College, Tongliao 028043
  • Received:1991-12-14 Revised:1992-09-15 Published:1993-06-15
  • Contact: Shen Yue-Nian

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.

关键词: LaNiO3, LaMnO3, 钙钛矿型晶体, XRD物相分析, 热分析

Abstract: Single phase perovskite-type oxides,polycrystal powder LaNiO_3 and LaMnO_3, have been prepared by decomposing mixed nitrates and citric acid compexing methods respectively. X-ray powder diffraction analysis showed that the formation of LaNiO_3 was 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 and IR etc. measurements, it was found that ion NO_3- took part in the formation of LaNiO_3 and LaMnO_3. At the same time, the function of the complexing agent was discussed. Citric acid favors fomation of single phase pevoskite-type oxides, especially in the case of LaMnO_3.

Key words: LaNiO3, LaMnO3, Peovskite-type crystal, X-ray powder diffraction, Thermoanalysis