高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (2): 284.doi: 10.7503/cjcu20120369

• 研究论文: 无机化学 • 上一篇    下一篇

熔融碱法制备三重价态钙钛矿锰氧化物

李明, 黄科科, 初学峰, 杜燕燕, 葛磊, 孙宇, 侯长民, 冯守华   

  1. 无机合成与制备化学国家重点实验室, 吉林大学化学学院, 长春 130012
  • 收稿日期:2012-04-18 出版日期:2013-02-10 发布日期:2013-01-21
  • 通讯作者: 侯长民,男,博士,副教授,主要从事无机固体材料研究.E-mail:houcm@jlu.edu.cn E-mail:houcm@jlu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 90922034 和21131002)和高等学校博士学科点专项科研基金(批准号: 20110061130005)资助.

Preparation of Perovskite Manganites with Three Oxidation States via the Molten Hydroxide Method

LI Ming, HUANG Ke-Ke, CHU Xue-Feng, DU Yan-Yan, GE Lei, SUN Yu, HOU Chang-Min, FENG Shou-Hua   

  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
  • Received:2012-04-18 Online:2013-02-10 Published:2013-01-21
  • Contact: Chang Min HOU E-mail:houcm@jlu.edu.cn

摘要:

以MnO2, Ca(OH)2和La(OH)3为反应原料, 在惰性气氛、 低温(500 ℃)熔融KOH体系中合成了具有菱形钙钛矿结构Ca, K共掺杂的La0.64Ca0.25K0.11MnO3纳米材料, 并对Mn的价态及磁学性能等进行了讨论. X射线光电子能谱(XPS)分析结果表明, La0.64Ca0.25K0.11MnO3纳米材料中的Mn具有三重混合价态, 其零场冷却低温磁化率曲线表现出顺磁-铁磁转变, 居里温度(Tc)为280 K.

关键词: 熔融碱法, 混合价态, 钙钛矿, 掺杂锰酸盐

Abstract:

Ca-K codoped La0.64Ca0.25K0.11MnO3 nanocrystals with rhombohedral structure were synthesized in a molten KOH system at temperature as low as 500 ℃ in the atmosphere of Ar. The starting materials were MnO2, Ca(OH)2 and La(OH)3. Mn oxidation state and magnetic properties of La0.64Ca0.25K0.11MnO3 were discussed. XPS results demonstrate that there is a mixed valence of Mn in the nanocrystal. The zero-field-cooled(ZFC) curve indicates the samples undergo a paramagnetic(PM) to ferromagnetic(FM) phase transition and the Curie temperature(Tc) is 280 K.

Key words: Molten hydroxide, Mixed valence, Perovskite, Doped manganite

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