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Ionic conductivity of KMgCr(MoO4)3 molybdate

  • Physical Properties of Crystals
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Abstract

The ionic conductivity σ of KMgCr(MoO4)3 crystal has been investigated in a temperature range of 575–932 K by impedance spectroscopy in the frequency range of (5–5) × 105 Hz. Ternary molybdate was obtained from the initial MgMoO4 and KCr(MoO4)2 reagents by solid-phase technique in air at 923–973 K for 200 h. The temperature dependence σ(T) of a ceramic sample exhibits a jump of σ by a factor of about 4 at 833 ± 5 K, which is caused by the first-order phase transition. The σ value above the phase-transition temperature reaches 6 × 10–4 S/cm (932 K) at an ion-transport activation enthalpy of 0.84 ± 0.05 eV. The most likely carriers in KMgCr(MoO4)3 are K+ cations.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics”, Russian Academy of Sciences, Moscow, 119333, Russia

    N. I. Sorokin

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  1. N. I. Sorokin
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Correspondence to N. I. Sorokin.

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Original Russian Text © N.I. Sorokin, 2017, published in Kristallografiya, 2017, Vol. 62, No. 3, pp. 419–421.

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Sorokin, N.I. Ionic conductivity of KMgCr(MoO4)3 molybdate. Crystallogr. Rep. 62, 416–418 (2017). https://doi.org/10.1134/S106377451703021X

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  • DOI: https://doi.org/10.1134/S106377451703021X

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