Synthesis and Mechanism of BaTiO3 Plate‐Like and Nanoparticle Films on Ti Substrate.

Abstract: Plate‐like and nanoparticle barium titanate (BaTiO₃ [BT]) films are synthesized on Ti substrate by low temperature reaction using Ti, Ba(AC)₂, and NaOH as raw materials. The films are characterized by XRD, SEM, TEM, and photoluminescence spectroscopy (PL) to obtain sizes, crystal structure, and emission peaks. The results show that BaTiO₃ plate‐like films can be obtained at 140 °C for 4 h have a stronger (110) diffraction peak than other conditions. The diameter is 2.08.0 µm. BaTiO₃ nanoparticle films are obtained via changing the reaction order and the average diameter is 30 nm. The adhesion strength of BaTiO₃ plate‐like film is 16.9 MPa and that of the nanoparticle film is 13.6 MPa. It is shown in PL results that the emission peaks of plate‐like films are from 663 to 691 nm. Finally, a solubility–crystallization mechanism and an in situ crystallization mechanism are proposed to explain the formation process of BaTiO₃ plate‐like films and nanoparticle films, respectively. [ABSTRACT FROM AUTHOR]