Hydrothermal method for manufacturing nano to microscale particles

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Producing micro- or nanoparticles of rare earth or transition metal compounds comprises hydrothermal precipitation from a metal salt solution using a soluble weakly basic precipitant. Independent claims are also included for : (1) micro- or nanoparticles of niobium or tantalum compounds produced as above; (2) sols comprising the above micro- or nanoparticles.