Crystallographic and electrical properties of epitaxial BaTiO3 film grown on conductive and insulating perovskite oxides

Yukio Watanabe, Yasuaki Matsumoto, Haruo Kunitomo, Mitsuru Tanamura, Erina Nishimoto

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69 Citations (Scopus)

Abstract

BaTiO3 films of various thicknesses were grown on doped and undoped SrTiO3(100) substrates and on (La, Sr)2 CuO4 films by a pulse laser deposition method. Both BaTiO3 and (La, Sr)2CuO4 films were smooth and free of par­ticulates. X-ray diffractometry showed that all materials were three-dimensionally aligned with the cube-on-cube epitaxial relationship, and that the films obtained on SrTiO3(100) were of a c-axis-oriented tetragonal phase con­trary to previous studies using metal bottom electrodes. As the film thickness decreased, the tetragonality of these films increased and the dielectric constant along the c-axis decreased rapidly, despite reduction of disorder at the interface by use of perovskite electrodes. The 2000-Å-thick BaTiO3 grown on (La, Sr)2CuO4 film had the remnant polarization of about 1.5 μC/cm2. The results were discussed using a surface layer model.

Original languageEnglish
Pages (from-to)5182-5186
Number of pages5
JournalJapanese Journal of Applied Physics
Volume33
Issue number9 S
DOIs
Publication statusPublished - Sep 1994
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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