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| La0.67-xBixSr0.33MnO3化合物多孔陶瓷样品的微结构与CMR效应 | |
| 引用本文： | 盛晓波,林萍华,翟亚,杨石强,童林夙.La0.67-xBixSr0.33MnO3化合物多孔陶瓷样品的微结构与CMR效应[J].磁性材料及器件,2003,34(5):1-3,7. |
| 作者姓名： | 盛晓波 林萍华 翟亚 杨石强 童林夙 |
| 作者单位： | 1. 东南大学,电子工程系,江苏南京,210096 2. 东南大学,机械工程系,江苏南京,210096;南京大学,固体微结构实验室,江苏南京,210093 3. 东南大学,物理系,江苏南京,210096;南京大学,固体微结构实验室,江苏南京,210093 4. 东南大学,机械工程系,江苏南京,210096 |
| 基金项目： | 南京大学校科研和教改项，东南大学校科研和教改项目，M991405，9202001016，， |
| 摘 要： | 用固相反应法制备了钙钛矿型氧化物La0．67-xBixSr0．33MnO3(x=0，0．1，0．2)多孔陶瓷样品，研究了这些化合物的电磁性质和CMR效应j实验结果显示，Bi有助于晶粒的长大，并使电阻率峰值向低温方向移动。多孔样品的MR主要取决于显微结构，在0-300K温度范围内MR随温度升高单调下降。在较高的温度下观察到了低场磁电阻(LFMR)效应。与多晶致密样品相比，化合物多孔样品的电阻率峰变宽，峰值下降。 |
| 关 键 词： | 钙钛矿 CMR LFMR 固相反应 多孔陶瓷 |
| 文章编号： | 1001-3830(2003)05-0001-03 |
Microstructure and CMR Effect in the Porous Ceramic La0.67-xBixSr0.33MnO3 Compounds |
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| SHENG Xiao-bo,LIN Ping-hua,ZHAI Ya,YANG Shi-qiang,TONG Lin-su.Microstructure and CMR Effect in the Porous Ceramic La0.67-xBixSr0.33MnO3 Compounds[J].Journal of Magnetic Materials and Devices,2003,34(5):1-3,7. | |
| Authors: | SHENG Xiao-bo LIN Ping-hua ZHAI Ya YANG Shi-qiang TONG Lin-su |
| Affiliation: | SHENG Xiao-bo1,LIN Ping-hua2,4,ZHAI Ya3,4,YANG Shi-qiang2,TONG Lin-su1 1. Department of Electronic Engineering,Southeast University,Nanjing 210096,China, 2. Department of Mechanical Engineering,Southeast University,Nanjing 2100963,China, 3. Department of Physics,Southeast University,Nanjing 210096,China, 4. Solid State Microstructure Physical Laboratory,Nanjing University,Nanjing 210093,China |
| Abstract: | The porous ceramic samples of La0.67-xBixSr0.33MnO3 (x=0, 0.1, 0.2) compounds have been prepared by solid state reaction. The electrical and magnetic properties as well as the CMR effect of these samples have been studied. The experimental results show that Bi can promote the growth of the crystal grain, increase the value of resistivity, and shift the resistivity peak to a lower temperature. The MR of the porous samples, which decreases monotonously with the rise of temperature in the temperature range of 0 to 300K, is mainly dependent on their microstructure. The LFMR effect has been observed at higher temperatures. Compared with the dense multicrystalline samples, the resistivity peaks are wider and the peak values are lower in the porous samples. |
| Keywords: | perovskites CMR LFMR solid state reaction ceramics |
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