SmCoO3钙钛矿氧化物的高压高温合成及其物性

SmCoO₃钙钛矿氧化物的高压高温合成及其物性

刘润茹¹,², 许大鹏¹, 薛燕峰¹, 吕喆¹,³, 李霜¹,⁴, 王德勇¹, 郭星原¹, 苏文辉¹,³,⁵

1. 吉林大学物理学院, 长春130021; 2. 长春大学理学院, 长春 130022; 3. 哈尔滨工业大学凝聚态科学与技术研究中心, 哈尔滨 150001; 4. 长春理工大学理学院, 长春 130022; 5. 中国科学院国际材料物理中心, 沈阳 110015

收稿日期:2007-01-27 修回日期:1900-01-01 出版日期:2008-01-26 发布日期:2008-01-26
通讯作者: 许大鹏

High Pressure and Temperature Synthesis and Properties of SmCoO₃

LIU Run ru¹,², XU Da peng¹, XUE Yan feng¹, Lv Zhe¹,³, LI Shuang¹,⁴, WANG De yong¹, GUO Xing yuan¹, SU Wen hui¹,³,⁵

1. College of Physics, Jilin University, Changchun 130021, China; 2. College of Science, Changchun University, Changchun 130022, China; 3. Center for the Condensed\|matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China; 4. School of Science, Changchun University of Science and Technology, Changchun 130022, China; 5. International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015, China

Received:2007-01-27 Revised:1900-01-01 Online:2008-01-26 Published:2008-01-26
Contact: XU Da peng

摘要/Abstract

摘要： 采用高压高温方法合成钙钛矿型SmCoO₃氧化物, 利用XRD,Raman,电导率和热膨胀测试对样品的结构及性能进行表征. 实验结果表明, 在2.75~4.20 GPa, 1 061 ℃附近, Co₂O₃和 Sm₂O₃发生固相反应形成SmCoO₃, 但反应不完全. 单相SmCoO₃较好的合成条件为3.90 GPa和1 061 ℃左右. 室温Raman谱观察到单相样品中只有SmCoO₃正交相的特征峰. SmCoO₃样品在327 ℃以下为绝缘体, 在327 ℃以上电导率随温度升高而增加. 热膨胀系数在100~800 ℃呈线性变化. 

关键词: SmCoO₃, 高压高温, 固相反应, 热膨胀系数

Abstract: Perovskite oxide SmCoO₃ was prepared by the high pressure and high temperature (HPHT) method. The structure and properties of the samples were investigated by XRD, Raman, electrical conductivity and thermal expansion measurement techniques. The results indicate that the raw materials Co₂O₃ and Sm₂O₃ can form SmCoO₃ under 2.75~4.20 GPa at about 1 060 ℃, but the reaction was not complete. The single phase SmCoO₃ was synthesized under the conditions of about 3.90 GPa and 1 061 ℃.The Raman spectra only shows the characteristic of orthogonal SmCoO₃. The single phase SmCoO₃ is an insulator under 327 ℃ and its electrical conductivity increases with temperature increasing, which shows an insulator-semiconductor-metal transition. The thermal expansion coefficient of the sample shows a linear change in a temperature range of 100~800 ℃, which is better than that of the sample prepared by solid-state reaction. 

Key words: SmCoO₃, high pressure and high temperature, solid state reaction, thermal expansion coefficient

中图分类号:

O521

刘润茹,, 许大鹏, 薛燕峰, 吕喆,, 李霜,, 王德勇, 郭星原, 苏文辉,,. SmCoO₃钙钛矿氧化物的高压高温合成及其物性[J]. J4, 2008, 46(01): 109-111.

LIU Run ru,, XU Da peng, XUE Yan feng, Lv Zhe,, LI Shuang,, WANG De yong, GUO Xing yuan, SU Wen hui,,. High Pressure and Temperature Synthesis and Properties of SmCoO₃[J]. J4, 2008, 46(01): 109-111.

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SmCoO₃钙钛矿氧化物的高压高温合成及其物性

High Pressure and Temperature Synthesis and Properties of SmCoO₃

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