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Preparation and phase composition of Ta2O5:Zn alloys having low Zn2+ concentrations

  • Synthesis and Properties of Inorganic Compounds
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Abstract

Methods were developed for preparing Ta2O5:Zn alloys containing less than 3 wt % Zn2+ for the purpose of using them further in preparing lithium tantalate batches and growing from them single crystals having improved properties. A method where zinc is doped directly into a tantalum-containing back-extract followed by precipitation of tantalum and zinc hydroxides with ammonia is confined to a Zn2+ concentration of 1.7 wt % in Ta2O5; at higher concentrations, Zn2+ forms soluble ammine complexes. A method where Zn2+ is extracted by high-purity tantalum hydroxide is applicable within the range of Zn2+ concentrations studied. Optimal conditions were found for preparing Ta2O5:Zn2+ alloys of various compositions. X-ray powder diffraction and IR spectroscopy were used to study the phase composition of the alloys synthesized, and Zn2+ concentrations were determined at which a ZnTa2O6 phase was formed along with the major Ta2O5 phase.

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Authors and Affiliations

  1. Tananaev Institute of Rare Earth Element and Mineral Chemistry and Technology, Kola Research Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmansk oblast, 184200, Russia

    S. M. Masloboeva, G. I. Kadyrova, O. A. Zalkind, V. Ya. Kuznetsov & L. G. Arutyunyan

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  1. S. M. Masloboeva
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  2. G. I. Kadyrova
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  3. O. A. Zalkind
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  4. V. Ya. Kuznetsov
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  5. L. G. Arutyunyan
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Correspondence to S. M. Masloboeva.

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Original Russian Text © S.M. Masloboeva, G.I. Kadyrova, O.A. Zalkind, V.Ya. Kuznetsov, L.G. Arutyunyan, 2013, published in Zhurnal Neorganicheskoi Khimii, 2013, Vol. 58, No. 3, pp. 321–327.

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Masloboeva, S.M., Kadyrova, G.I., Zalkind, O.A. et al. Preparation and phase composition of Ta2O5:Zn alloys having low Zn2+ concentrations. Russ. J. Inorg. Chem. 58, 274–279 (2013). https://doi.org/10.1134/S0036023613030108

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  • DOI: https://doi.org/10.1134/S0036023613030108

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