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In a hydrothermal process, precursor solution in the presence of an alkali is autoclaved at a certain temperature for a specific time. In a typical process, aqueous solution of precursor and KOH is mixed and placed in a Teflon-lined stainless-steel autoclave. The autoclave is maintained at 70–200 °C for 10–24 h depending on the process and then air-cooled to room temperature. Resulting precipitate is collected by filtration, washed and finally dried. For example, nickel ferrite particles prepared by hydrothermal process resulted in particles of size distribution from 40–90 nm [8].