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The Structure and Defect Chemistry of Non-Stoichiometric Nickel Molybdates

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Abstract

A series of materials represented by the formula Ni1;δMo1−δ/3O4, where -1/5 ≤ δ ≤ 1/3, were prepared by calcination of layered ammonium nickel molybdates having a general formula (NH4)H2xNi3-xO(OH)(MoO4)2, where 0 ≤ x ≤ 3/2. Phase determination using high temperature X-ray diffraction studies showed that the variable stoichiometry of the precursor phase that allowed for Ni/Mo ratios between 0.75 and 1.5 led to the formation of a single phase of the form Ni1;δMo1−δ/3O4 following calcination. AC impedance spectroscopy was used to investigate the electronic conductivity of the materials. The defect chemistry of these ternary ionic materials was modeled to correlate the electronic conductivity with the structure.

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Authors and Affiliations

  1. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139

    Doron Levin & Jackie Y. Ying

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  1. Doron Levin
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  2. Jackie Y. Ying
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Levin, D., Ying, J.Y. The Structure and Defect Chemistry of Non-Stoichiometric Nickel Molybdates. Journal of Electroceramics 3, 25–36 (1999). https://doi.org/10.1023/A:1009910815113

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