The method for producing a metal oxide nanocrystal is a method for producing a metal oxide nanocrystal containing a metal oxide composed of lead titanate or lead zirconate titanate. Alternatively, a mixed solution forming step of mixing a water-soluble titanium complex aqueous solution and a water-soluble zirconium complex aqueous solution with a quaternary ammonium compound to form a mixed solution, and heating the mixed solution to synthesize metal oxide nanocrystals A heating step; and a separation step of separating the metal oxide nanocrystals and the residual liquid.
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