Tantalate

Tantalate is an tantalum-containing anion or a salt of such an anion. A commercially important example is heptafluorotantalate (TaF₇²⁻) and its potassium salt (K₂TaF₇).

Potassium heptafluorotantalate.

Many oxides of tantalum are called tantalates. They are viewed as derivatives of "tantalic acid", hypothetic compounds with the formulas Ta₂O₅·nH₂O[1] or HTaO₃[2]). Examples of such tantalates are lithium tantalate (LiTaO₃), lutetium tantalate (LuTaO₄) and lead scandium tantalate (PST or Pb(Sc_xTa_1-x)O₃. Polyoxometallates containing tantalum provide examples of discrete tantalum oxides that exist in solution.

References

Szanics, Judit; Kakihana, Masato (1999). "A Novel Tantalic Acid-Based Polymerizable Complex Route to LiTaO₃ Using Neither Alkoxides nor Chlorides of Tantalum". Chemistry of Materials. 11 (10): 2760. doi:10.1021/cm990160d.
Inoue, Y (1996). "Synthetic inorganic ion exchange materials XLI: Ion exchange properties of cubic tantalic acid (HTaO3)". Materials Research Bulletin. 31 (6): 691–698. doi:10.1016/0025-5408(96)00050-5.

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[1] Szanics, Judit; Kakihana, Masato (1999). "A Novel Tantalic Acid-Based Polymerizable Complex Route to LiTaO₃ Using Neither Alkoxides nor Chlorides of Tantalum". Chemistry of Materials. 11 (10): 2760. doi:10.1021/cm990160d.

[2] Inoue, Y (1996). "Synthetic inorganic ion exchange materials XLI: Ion exchange properties of cubic tantalic acid (HTaO3)". Materials Research Bulletin. 31 (6): 691–698. doi:10.1016/0025-5408(96)00050-5.