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高等学校化学研究 ›› 2012, Vol. 28 ›› Issue (5): 784-787 .

• Articles • 上一篇    下一篇

Room Temperature Modulated Structure of Ca and K co-Doped LaMnO3

HOU Chang-min, HUANG Ke-ke, HU Bin, YUAN Hong-ming, FENG Shou-hua   

  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
  • 收稿日期:2011-08-31 修回日期:2011-12-07 出版日期:2012-09-25 发布日期:2012-09-07
  • 通讯作者: FENG Shou-hua E-mail:shfeng@jlu.edu.cn
  • 基金资助:
    Supported by the National Natural Science Foundation of China(No.90922034).

Room Temperature Modulated Structure of Ca and K co-Doped LaMnO3

HOU Chang-min, HUANG Ke-ke, HU Bin, YUAN Hong-ming, FENG Shou-hua   

  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
  • Received:2011-08-31 Revised:2011-12-07 Online:2012-09-25 Published:2012-09-07
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.90922034).

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摘要： A series of perovskite compounds of La1-x-yCaxKyMnO3 was prepared by hydrothermal disproportionation reaction of MnO2. The three oxidation states of manganese(Mn3+, Mn4+ and Mn5+) can stably exist in the compounds. Under room temperature conditions, twice and three times modulated structure produced by the charge ordering can be observed by X-ray diffraction(XRD), select area electron diffraction(SAED) and high resolution transmission electron microscopy(HR-TEM). The splits of the diffraction peaks of the single crystals confirmed by synchrotron X-ray diffraction experiment are in accordance with those of the powder sample. The existence of the different oxidation states of Mn3+, Mn4+ and Mn5+ can be considered to be the dominating reason of the complicated room temperature modulated structure.

关键词: Modulated structure, Mixed valence state, Room temperature

Abstract: A series of perovskite compounds of La1-x-yCaxKyMnO3 was prepared by hydrothermal disproportionation reaction of MnO2. The three oxidation states of manganese(Mn3+, Mn4+ and Mn5+) can stably exist in the compounds. Under room temperature conditions, twice and three times modulated structure produced by the charge ordering can be observed by X-ray diffraction(XRD), select area electron diffraction(SAED) and high resolution transmission electron microscopy(HR-TEM). The splits of the diffraction peaks of the single crystals confirmed by synchrotron X-ray diffraction experiment are in accordance with those of the powder sample. The existence of the different oxidation states of Mn3+, Mn4+ and Mn5+ can be considered to be the dominating reason of the complicated room temperature modulated structure.

Key words: Modulated structure, Mixed valence state, Room temperature