Patent ID: 8808522

Claim:
A method for forming a BaTiO 3 film by plasma electrolytic Oxidation (PEO) comprising steps of: (a) placing an anode, which is a substrate deposited with a TiN film, and a cathode into an electrolyte of which the temperature range is from 65° C. to 75° C., wherein said electrolyte contains barium acetate ranging from 0.3 M to 0.7 M and sodium hydroxide or potassium hydroxide ranging from 1.5 M to 2.5 M; and (b) applying a voltage ranging from 65 V (volts) to 75 V to said anode and cathode to from a BaTiO 3 film on a surface of said TiN film, wherein a DC power supply, and AC power supply, unipolar pulse power supply or bipolar pulse power supply is applied to said anode and cathode in constant-voltage mode or constant-current mode.