| 熔融碱法制备三重价态钙钛矿锰氧化物 |
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| 引用本文： | 李明,黄科科,初学峰,杜燕燕,葛磊,孙宇,侯长民,冯守华.熔融碱法制备三重价态钙钛矿锰氧化物[J].高等学校化学学报,2013,34(2):284-287. |
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| 作者姓名： | 李明 黄科科 初学峰 杜燕燕 葛磊 孙宇 侯长民 冯守华 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金(批准号:90922034和21131002);高等学校博士学科点专项科研基金(批准号:20110061130005)资助 |
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| 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.
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| 关 键 词： | 熔融碱法 混合价态 钙钛矿 掺杂锰酸盐 |
| 收稿时间： | 2012-04-18 |
Preparation of Perovskite Manganites with Three Oxidation States via the Molten Hydroxide Method |
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| LI Ming,HUANG Ke-Ke,CHU Xue-Feng,DU Yan-Yan,GE Lei,SUN Yu, HOU Chang-Min,FENG Shou-Hua.Preparation of Perovskite Manganites with Three Oxidation States via the Molten Hydroxide Method[J].Chemical Research In Chinese Universities,2013,34(2):284-287. |
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| Authors: | LI Ming HUANG Ke-Ke CHU Xue-Feng DU Yan-Yan GE Lei SUN Yu HOU Chang-Min FENG Shou-Hua |
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| Institution: | State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China |
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| 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. |
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| Keywords: | Molten hydroxide Mixed valence Perovskite Doped manganite |
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