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The novel optical and magnetic properties in Li-doped quasi-2D manganate Ca3Mn2O7 particles

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 develops at ~120K, while with weak ferromagnetism. Li doping had a positive influence on enhancing magnetism of system. Oxygen vacancies in crystal have an important impact on the electronic properties. Interestingly, a small amount of Li substitution markedly decreased oxygen vacancies, which hence introduces disorder and leads to widening band gap. The obtained value of 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 hybrid functional was used to investigate the electronic properties and structure of Ca3Mn2O7, which gave a more approximate value.

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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, Accepted Manuscript
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    The novel optical and magnetic properties in 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, Accepted Manuscript , DOI: 10.1039/C7TC01667K

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