Synthesis of Tantalum Multiple Oxides from New Halogen-free Aqueous Tantalum Solution

Abstract

Conventional usage of TaCl₅ in the polymerizable complex (PC) method results in the corrosion of experimental equipment and degradation of functional properties of the obtained materials due to the residual chloride. In this report ammonium and guanidine salts of tantalum-citric acid complex were used as soluble tantalum compounds. Four tantalum containing complex oxides (NaTaO₃, SrTa₂O₆, Sr₂Ta₂O₇ and Sr₅Ta₄O₁₅) were successfully synthesized by PC method using these chloride-free precursors.