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| La_(1-x)Sr_xCoO_3体系的绝缘体-金属相变 | |
| 引用本文： | 蒋丽珍,何雪竹,余虹,邬良能.La_(1-x)Sr_xCoO_3体系的绝缘体-金属相变[J].中国计量学院学报,2006,17(3):224-227. |
| 作者姓名： | 蒋丽珍 何雪竹 余虹 邬良能 |
| 作者单位： | 1. 中国计量学院,理学院,浙江,杭州,310018 2. 杭州市陈经伦体育学校,浙江,杭州,310007 3. 杭州师范学院,基础教育学院,浙江,杭州,310036 |
| 摘 要： | 通过粉末X射线衍射分析确定了钙钛矿氧化物La1-xSrxCoO3(0.1≤x≤0.5)体系的结构,由Ri-etveld方法拟合得到晶格参数随Sr掺杂量的变化.在80~300 K温度范围的直流电阻率测量表明,材料的电性质在x=0.2和x=0.3之间展示了从半导体到金属的相变.x=0.2样品已接近绝缘体-金属(I—M)相变的边缘.研究结果表明,La1-xSrxCoO3(0.1≤x≤0.5)体系的I-M相变不仅依赖于Sr浓度x,也依赖于样品的制备技术. |
| 关 键 词： | 钙钛矿 晶格参数 电阻率 |
| 文章编号： | 1004-1540（2006）03-0224-04 |
| 收稿时间： | 2006-05-25 |
| 修稿时间： | 2006-05-25 |
Metal-Insulator transition of La1-xSrxCoO3 system |
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| JIANG Li-zhen,HE Xue-zhu,YU Hong,WU Liang-neng.Metal-Insulator transition of La1-xSrxCoO3 system[J].Journal of China Jiliang University,2006,17(3):224-227. | |
| Authors: | JIANG Li-zhen HE Xue-zhu YU Hong WU Liang-neng |
| Affiliation: | 1. Department of Physics, China Jiliang Universty, Hangzhou 310018, China;2. Hangzhou Chen Jinglun Sports School, Hangzhou 310007, China; 3. Hangzhou Normal College, Hangzhou 310036, China |
| Abstract: | The crystal structure of perovskite oxide La_1-xSr_xCoO_3(0≤x≤0.5) was determined by powder X-ray diffraction.Lattice parameters as a function of Sr-concentration x were obtained by using Rietveld method.The dc resistivity investigated in the temperature range of 80-300 K indicates that the electric properties exhibit a metal-insulator(semiconducting)(I-M) transition for 0.2 |
| Keywords: | perovskites lattice parameter resistivity |
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