钙钛矿复合氧化物La0.6Sr0.4Fe0.8Co0.2O3的合成与电学性能

无机材料学报

钙钛矿复合氧化物La_0.6Sr_0.4Fe_0.8Co_0.2O₃的合成与电学性能

黄端平¹; 徐庆^1,2; 陈文^1,2; 王皓²; 袁润章²

武汉理工大学1. 材料科学与工程学院; 2. 材料复合新技术国家重点实验室, 武汉 430070

收稿日期:2002-08-23 修回日期:2002-09-20 出版日期:2003-09-20 网络出版日期:2003-09-20

Synthesis and Electrical Properties of Perovskite-type Oxides Made by Glycine-Nitrate Process

HUANG Duan-Ping¹; XU Qing^1,2; CHEN Wen^1,2; WANG Hao²; YUAN Run-Zhang²

1. Institute of Materials Science and Engineering; 2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing; Wuhan University of Technology; Wuhan 430070; China

Received:2002-08-23 Revised:2002-09-20 Published:2003-09-20 Online:2003-09-20

摘要/Abstract

摘要： 采用甘氨酸-硝酸盐(GNP)法合成出La_0.6Sr_0.4Fe_0.8Co_0.2O₃超细粉体,探讨各因素对产物的晶体结构和显微形貌的影响,研究烧成温度对电导率的影响.研究表明,G/Mⁿ⁺控制在2.0—3.0、热处理温度为750℃是最佳的合成条件,1200℃烧成样品具有最优良的电性能.在室温～900℃温度范围内,样品的电导率在600℃附近出现最大值,低温段的导电行为符合小极化子导电机制.与常规固相法相比,GNP法制备样品具有更好的烧结活性和导电性能.

关键词: La_0.6Sr_0.4Fe_0.8Co_0.2O₃, 钙钛矿复合氧化物, 甘氨酸-硝酸盐法, 电导率

Abstract: La_0.6Sr_0.4Fe_0.8Co_0.2O₃ oxides powders of perovskite-type were synthesized by the low temperature
Glycine-Nitrate Process(GNP). The contributing factors to the crystal structure and morphology of synthesized powders were examined, and the desired synthesis
conditions were studied. The influences of sintering temperature on the electrical conductivities were studied, indicating that the sample sintered
at 1200℃ showed highest electrical conductivity. In the range of room temperature to 900℃, the electrical conductivities of the
samples sintered at different temperatures respectively increase with temperature to the maximums near 600℃ and then decrease. It was
verified that the hopping of small polaron is the dominating mechanism of the electrical conduction at low temperatures. The samples sintered at
different temperatures have similar activation energies of 0.103～0.122eV. Compared with the La_0.6Sr_0.4Fe_0.8Co_0.2O₃ synthesized
by the conventional solid state reaction method, those synthesized by GNP exhibit better sintering activity and electrical conductivities.

Key words: La_0.6Sr_0.4Fe_0.8Co_0.2O₃, perovskite-type oxides, glycine-nitrate process, electrical conductivity

中图分类号:

TQ174

黄端平,徐庆,陈文,王皓,袁润章. 钙钛矿复合氧化物La_0.6Sr_0.4Fe_0.8Co_0.2O₃的合成与电学性能[J]. 无机材料学报.

HUANG Duan-Ping,XU Qing,CHEN Wen,WANG Hao,YUAN Run-Zhang. Synthesis and Electrical Properties of Perovskite-type Oxides Made by Glycine-Nitrate Process[J]. Journal of Inorganic Materials.

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钙钛矿复合氧化物La_0.6Sr_0.4Fe_0.8Co_0.2O₃的合成与电学性能

Synthesis and Electrical Properties of Perovskite-type Oxides Made by Glycine-Nitrate Process

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