高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (4): 643.doi:

• 研究论文 • 上一篇    下一篇

LaMn1-xMgxO3钙钛矿的低温磁性

梁宏伟1, 陈岩1, 张晓霞1, 张士晶2, 张刚华1, 袁宏明1, 冯守华1   

    1. 吉林大学无机合成与制备化学国家重点实验室,
    2. 物理学院, 长春 130012
  • 收稿日期:2008-09-07 出版日期:2009-04-10 发布日期:2009-04-10
  • 通讯作者: 冯守华 E-mail:shfeng@jlu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20631010, 20771042)资助.

Magnetic Behavior at Low Temperature of LaMn1-xMgxO3

LIANG Hong-Wei1, CHEN Yan1, ZHANG Xiao-Xia1, ZHANG Shi-Jing2, ZHANG Gang-Hua1, YUAN Hong-Ming1, FENG Shou-Hua1*   

    1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,
    2. College of Physics, Jilin University, Changchun 130012, China
  • Received:2008-09-07 Online:2009-04-10 Published:2009-04-10
  • Contact: FENG Shou-Hua, E-mail:shfeng@jlu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20631010, 20771042)资助.

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.

关键词: 钙钛矿, Mg掺杂, 自旋玻璃态

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.

Key words: Perovskite, Mg-substitution, Spin-glass

中图分类号: 

TrendMD: