Synthesis and characterization of Mn-, La-Mn- and La-Ca-Mn-citrates as precursors for LaMnO3 and La1-xCaxMnO3

被引：8
作者：
Petrova, NL
Todorovsky, DS
Vasileva, VG
机构：
[1] Univ Sofia, Fac Chem, Sofia 1164, Bulgaria
[2] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria
来源：
CENTRAL EUROPEAN JOURNAL OF CHEMISTRY | 2005年 / 3卷 / 02期
关键词：
complexes; citrates; polymerized complex method; lanthanum; manganites;
D O I：
10.2478/BF02475995
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Mn-, LaMn- and LaCaMn-citrates were synthesized at 60-120 degrees C in ethylene glycol medium using chlorides or nitrates as metal sources. Their composition, IR spectra and thermal decomposition were studied. Equimolar La/Mn ratio has been established in the complex, prepared from chloride solution with the same initial composition of the metals. In the isolated three-metallic complex the molar ratio of the metals deviates from the composition in the initial solution. The final products of the heating of Mn- and mixed-metal LaMn-citrates at 1000 degrees C are phase-homogeneous Mn3O4 (hausmannite) and LaMnO3 respectively. Parasitic phase(s) are observed in LaxCa1-xMnyO3, produced from LaCaMn-citrate. (C) Central European Science Journals. All rights reserved.
引用
收藏
页码：263 / 278
页数：16
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