A process for producing valve metal oxides, such as tantalum pentoxide or niobium
pentoxide with a narrow particle size distribution within a desired particle size
range, is provided. According to the process of the present invention, the valve
metal fraction from digestion of valve metal material containing ore is processed
under controlled temperature, pH, and residence time conditions to produce the
valve metal pentoxide and pentoxide hydrates. Also, disclosed are new tantalum
pentoxide and niobium pentoxide products and new tantalum pentoxide precursors
and niobium pentoxide precursors.