| LaMn1-xMgxO3钙钛矿的低温磁性 |
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| 引用本文： | 梁宏伟,陈岩,张晓霞,张士晶,张刚华,袁宏明,冯守华.LaMn1-xMgxO3钙钛矿的低温磁性[J].高等学校化学学报,2009,30(4):643-646. |
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| 作者姓名： | 梁宏伟 陈岩 张晓霞 张士晶 张刚华 袁宏明 冯守华 |
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| 作者单位： | 1. 吉林大学无机合成与制备化学国家重点实验室,长春,130012
2. 吉林大学物理学院,长春,130012 |
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| 摘 要： | 采用乙二胺四乙酸-柠檬酸联合溶胶凝胶法合成了B位掺镁的简单钙钛矿纯相样品LaMn1-xMgxO3(x=0~0.50). Mg在钙钛矿B位的掺杂和调节Mn3+/Mn4+的摩尔比强烈地影响样品的磁性行为. x≤0.08时, 样品低温下表现弱的铁磁性; x≥0.18时, 随着Mg掺杂引入的Mn4+离子间的反铁磁性超交换作用与Mn3+-Mn4+离子间的铁磁性双交换作用使样品在低温下呈现自旋玻璃态. 随着Mg2+掺杂量的增加, 样品的磁有序温度与自旋凝固温度单调降低.
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| 关 键 词： | 钙钛矿 Mg掺杂 自旋玻璃态 |
| 收稿时间： | 2008-09-07 |
Magnetic Behavior at Low Temperature of LaMn_(1-x)Mg_xO_3 |
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| LIANG Hong-Wei,CHEN Yan,ZHANG Xiao-Xia,ZHANG Shi-Jing,ZHANG Gang-Hua,YUAN Hong-Ming,FENG Shou-Hua.Magnetic Behavior at Low Temperature of LaMn_(1-x)Mg_xO_3[J].Chemical Research In Chinese Universities,2009,30(4):643-646. |
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| Authors: | LIANG Hong-Wei CHEN Yan ZHANG Xiao-Xia ZHANG Shi-Jing ZHANG Gang-Hua YUAN Hong-Ming FENG Shou-Hua |
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| Institution: | 1.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry;2.College of Physics;Jilin University;Changchun 130012;China |
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| Abstract: | The substitution of Mn with Mg in LaMnO3 strongly affects the magnetic properties at low temperature and the crystal structure of the LaMn1-xMgxO3 system. Sample displays weak ferromagnetic at low tempe-rature when x≤0.08, and the spin-glass state was observed at low temperature when x≥0.18; the existance of nonferromagnetic Mg2+ ions in perovskite B site is an important factor for magnetic behavior at low temperature of LaMn1-xMgxO3 samples. Magnetic ordered temperature and spin frozen temperature monotonously decrease with the increase of Mg-substitution. |
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| Keywords: | Perovskite Mg-substitution Spin-glass |
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