Epitaxial BaTiO3 on Pt Substrate

Epitaxial layers of BaTiO₃ grow on Pt substrates when: (1) The Pt substrate has preferred orientation $\text{〈111〉}$ ; (2) BaTiO₃ powder is sintered on this substrate at 1400°C for 24 h in air. The epitaxial BaTiO₃ is single crystalline with an orientation of {111}BaTiO₃//{111}_Pt but with a deformation in crystal structure. X‐ray diffraction data indicate that the spacing d₁₁₁ is larger by about 1% (0.023 Å) than that of original BaTiO₃ which is tetragonal phase at room temperature. The dielectric measurements show that the remanent polarization and the dielectric constant of this specimen are about ¼ and $\frac{1}{10}$ values of those of polycrystalline BaTiO₃, respectively.