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Issue 43, 2014
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Defect induced sodium disorder and ionic conduction mechanism in Na1.82Mg1.09P2O7

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Abstract

Phase pure sodium magnesium pyrophosphate Na1.82Mg1.09P2O7 was synthesized by a solid state reaction, and used as a model system to understand the Na+ dynamics in the related cathode materials Na2−xM1+x/2P2O7 (M = Fe, Mn, and Co). We found a three-dimensional framework structure formed by interconnecting Mg2O11 dimers with P2O7 pyrophosphate groups, where Na cages align along the [100] direction and are kinetically separated from each other. Diffuse distribution of Na was found inside the cage, and explained using a vacancy induced disorder model. Ionic conductivity is limited by inter-cage diffusion and measured to be 1.10 × 10−11 S cm−1 at room temperature with an activation energy of 0.77 eV. These features were further supported by bond-valence sum and lattice mechanics calculations.

Graphical abstract: Defect induced sodium disorder and ionic conduction mechanism in Na1.82Mg1.09P2O7

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Publication details

The article was received on 01 Jul 2014, accepted on 30 Aug 2014 and first published on 02 Sep 2014


Article type: Paper
DOI: 10.1039/C4TA03356F
Citation: J. Mater. Chem. A, 2014,2, 18353-18359
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    Defect induced sodium disorder and ionic conduction mechanism in Na1.82Mg1.09P2O7

    G. Liu, S. Nishimura, S. C. Chung, K. Fujii, M. Yashima and A. Yamada, J. Mater. Chem. A, 2014, 2, 18353
    DOI: 10.1039/C4TA03356F

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