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Low-Temperature Synthesis of Compounds with the Pyrochlore and Hexagonal Tungsten Bonze Structure

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Inorganic Materials Aims and scope

Abstract—

This paper reports the synthesis of compounds with the pyrochlore and hexagonal tungsten bronze structures via thermal decomposition of heteropolyoxometalates. Using aqueous solutions, we have synthesized tungstophosphatometalates with the Keggin structure and the general formula Ct5[PW11O39(H2O)Z]⋅nH2O, where Ct = Rb+ or Cs+ and Z = Co2+, Ni2+, or Cu2+. We have studied the thermal decomposition of these compounds and identified their thermolysis products: phases with the pyrochlore and hexagonal tungsten bronze structures. Our results confirm that phosphorus, cobalt, nickel, and copper ions become incorporated into the pyrochlore and hexagonal tungsten bronze structures of the CtnxPxZxW2–2xO6 compounds. No phases with similar chemical compositions have been reported previously. Their synthesis temperature has been lowered by 200°C and the calcination time has been reduced by a factor of 2 in comparison with conventional synthesis methods. The proposed schemes of thermolysis of rubidium and cesium tungstophosphatometalates will be useful for predicting the thermal properties and phase composition of thermolysis products of analogous heteropolyoxometalates in designing new inorganic materials based on them.

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Authors and Affiliations

  1. Lytvynenko Institute of Physico-Organic and Coal Chemistry, National Academy of Sciences of Ukraine, 83114, Donetsk, Ukraine

    Ya. A. Moroz & N. S. Lozinskii

  2. Shukhov State Technological University, 308012, Belgorod, Russia

    A. N. Lopanov

  3. Donetsk National University, 83055, Donetsk, Ukraine

    K. A. Chebyshev

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  1. Ya. A. Moroz
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  2. N. S. Lozinskii
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Correspondence to Ya. A. Moroz.

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Translated by O. Tsarev

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Moroz, Y.A., Lozinskii, N.S., Lopanov, A.N. et al. Low-Temperature Synthesis of Compounds with the Pyrochlore and Hexagonal Tungsten Bonze Structure. Inorg Mater 57, 835–842 (2021). https://doi.org/10.1134/S0020168521080069

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