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

doi:10.7503/cjcu20120369

Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (2): 284.doi: 10.7503/cjcu20120369

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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

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

Abstract

Abstract:

Ca-K codoped La_0.64Ca_0.25K_0.11MnO₃ 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 La_0.64Ca_0.25K_0.11MnO₃ 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(T_c) is 280 K.

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

CLC Number:

O611.4

TrendMD:

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]. Chem. J. Chinese Universities, 2013, 34(2): 284.

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

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