| 掺杂对巨磁电阻钙钛矿La1-xAx(MnB)O3 Curie温度的影响 |
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| 引用本文： | 张栋杰,蒋晓龙,都有为.掺杂对巨磁电阻钙钛矿La1-xAx(MnB)O3 Curie温度的影响[J].硅酸盐学报,2002,30(4):470-473. |
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| 作者姓名： | 张栋杰 蒋晓龙 都有为 |
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| 作者单位： | 1. 南京大学固体微结构国家重点实验室,南京,210093;南京师范大学分析测试中心,南京,210097
2. 南京大学固体微结构国家重点实验室,南京,210093 |
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| 基金项目： | 国家973项目(G1999064508); 国家自然科学基金资助项目(19890310). |
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| 摘 要： | 测定了La1-xAx(MnB)O3（A为二价元素）型巨磁电阻钙钛矿化合物在不同组成的Curie温度。钙钛矿锰氧化物La1-xAx(MnB)O3的A位离子掺杂引起的晶格畸变可以用晶格能来表示，晶格能的大小能很好解释A位离子掺杂引起的Curie温度变化；B位离子掺杂引起的晶格畸变可用极化力来表示，极化力的大小很好解释了B位离子掺杂引起的Curie温度变化。钙钛矿锰氧化物的A，B位离子同时掺杂引起晶格畸变，可以用晶格能和极化力的综合判断系数（晶格能／极化力）来表示，它能很好解释A和B位离子同时改变引起的Curie温度变化，理论与实验结果一致。
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| 关 键 词： | 掺杂 La1－xAx（MnB）O3 影响 巨磁电阻效应 钙钛矿 晶格能 极化 Curie 曙度 |
| 文章编号： | 0454-5648(2002)04-0470-04 |
| 修稿时间： | 2001年9月28日 |
EFFECT OF DOPING ON CURIE-TEMPERATURE OF La1-xAx(MnB)O3 PEROVSKITES WITH COLOSSAL MAGNETORESISTANCE |
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| ZHANG Dongjie ,JIANG Xiaolong ,DU Youwei.EFFECT OF DOPING ON CURIE-TEMPERATURE OF La1-xAx(MnB)O3 PEROVSKITES WITH COLOSSAL MAGNETORESISTANCE[J].Journal of The Chinese Ceramic Society,2002,30(4):470-473. |
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| Authors: | ZHANG Dongjie JIANG Xiaolong DU Youwei |
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| Affiliation: | ZHANG Dongjie 1,2,JIANG Xiaolong 1,DU Youwei 1 |
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| Abstract: | The Curie_temperature of some La 1- x A x (MnB)O 3 perovskite manganates with colossal magnetoresistance was tested. The crystal lattice aberration caused by A_site dopant can be shown by the energy of crystal lattice in La 1- x A x (MnB)O 3 perovskite manganates. The magnitude of the energy can well explain the shift of the Curie_temperature caused by A_site dopant. The crystal lattice aberration caused by B_site dopant can be expressed by the power of electric polarization,which interprets the shift of the Curie_temperature caused by B_site dopant. The crystal lattice aberration caused by A_site and B_site dopants together can be described by an integrative coefficient (ratio of energy of crystal lattice/power of electric polarization), which well interprets the shift of the Curie_temperature. The results from theory and the experiments are found in good agreement. |
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| Keywords: | colossal magnetoresistance effect perovskite energy of crystal lattice electric polarization Curie temperature |
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