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Preparation of Li3-x H x TaO4 by means of hydrothermal synthesis and protolysis

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Abstract

Protolysis of lithium orthotantalates resulted in ion exchange of Li+ with H+ and Li3−x H x TaO4 was produced. From the disordered NaCl-type form of Li3TaO4, Li1.2H1.8TaO4 was produced by the ion exchange. The same compound was obtained directly from amorphous tantalum oxide and LiOH solution under hydrothermal conditions. Its lattice constant was calculated to bea=0.4270 (2) nm (standard deviation in brackets) in the cubic system. Substitution of Li+ with H+ inβ-Li3TaO4 resulted in formation of Li1.1H1.9TaO4. Its lattice constants in the triclinic system are estimated to bea=0.892 (1),b=0.852 (2),c=0.944 (1) nm,α=89.1 (1),β=117.1 (1) andγ=87.1 (1)°. An expansion of thea-axis on the ion exchange and the composition imply that Li+ ions forming corrugated planes stacked along thea-axis in the ordered Nacl-type structure was replaced with H+.

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Authors and Affiliations

  1. Institute of Inorganic Synthesis, Yamanashi University Miyamae-cho 7, 400, Kofu, Japan

    N. Kumada, N. Ozawa, N. Kinomura & F. Muto

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  1. N. Kumada
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  2. N. Ozawa
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  3. N. Kinomura
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  4. F. Muto
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Kumada, N., Ozawa, N., Kinomura, N. et al. Preparation of Li3-x H x TaO4 by means of hydrothermal synthesis and protolysis. J Mater Sci 21, 4140–4142 (1986). https://doi.org/10.1007/BF01106519

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  • DOI: https://doi.org/10.1007/BF01106519

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