Aging characteristics of ferroelectric epitaxial BaTiO3/YBa2Cu3O7 heterostructures

Samuel D. Harkness, J. W. Viatella, V. Nagabushnam, R. K. Singh

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


The nature of ferroelectric aging of epitaxial BaTiO3/YBa2Cu3O7 heterostructures grown by laser deposition was investigated as a function of microstructure in the dielectric layer. Molar amounts of SrTiO3 were then substitutionally added to analyze the effect on the microstructure and electrical properties. Corresponding shifts in c/a ratio and curie temperature were correlated to changes in aging rate (%ΔC/decade time). Microstructural analysis was provided by high-resolution x-ray diffraction (HRXRD), and Rutherford backscattering spectroscopy (RBS). Results indicate a moderate upward shift in c/a ratios from theoretical values due to increasing lattice strain across the bilayer interface. Minimum channel yields in RBS spectra were maintained between 6-8% for BaTiO3 purities above 60%. Dielectric measurements were conducted using an impedance analyzer equipped with an isothermal chamber capable of maintaining ±1 °C. The dielectric properties were consistent with c-axis oriented BaTiO3 values (k = 120, D = .02) Minimum aging rates are observed at the lower c/a ratio compositions to be as low as .07%ΔC/decade.

Original languageEnglish
Pages (from-to)373-378
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
StatePublished - 1994
Externally publishedYes
EventProceedings of the 1994 MRS Spring Meeting - San Francisco, CA, USA
Duration: 4 Apr 19948 Apr 1994


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