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Issue 28, 2017
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Novel optical and magnetic properties of Li-doped quasi-2D manganate Ca3Mn2O7 particles

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Abstract

Ruddlesden–Popper (RP) structural Li2xCa3−2xMn2O7 (x = 0–0.05) particles were successfully synthesized via a citrate sol–gel method. At higher temperatures quasi-two-dimensional antiferromagnetic fluctuation effects were observed and antiferromagnetic order developed at ∼120 K, but with weak ferromagnetism. Li doping has a positive influence on enhancing the magnetism of the system. Oxygen vacancies in crystals have an important impact on the electronic properties. Interestingly, a small amount of Li substitution markedly decreases oxygen vacancies, which hence introduces disorder and leads to widening of the band gap. The obtained value of the band gap from UV-vis measurements is ∼2.88 eV which is much larger than the previous theory calculation. To appropriately correct the band gap, a more reliable method of the hybrid functional was used to investigate the electronic properties and structure of Ca3Mn2O7, which gave a more approximate value.

Graphical abstract: Novel optical and magnetic properties of Li-doped quasi-2D manganate Ca3Mn2O7 particles

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Publication details

The article was received on 17 Apr 2017, accepted on 19 Jun 2017 and first published on 19 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01667K
Citation: J. Mater. Chem. C, 2017,5, 7011-7019
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    Novel optical and magnetic properties of Li-doped quasi-2D manganate Ca3Mn2O7 particles

    X. Zhang, W. Liu, Y. Han, C. Huang, P. Wu, W. Zhou, J. Gao, G. Rao and S. Wang, J. Mater. Chem. C, 2017, 5, 7011
    DOI: 10.1039/C7TC01667K

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