In-situ x-ray diffraction study of phase transitions in epitaxial KNbO3 thin films

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Abstract

Epitaxial and stoichiometric thin films of ferroelectric KNbO3 (110) were deposited on SrTiO3 (100) substrate by Jaser ablation. From X-ray diffraction, in the orthorhombic phase of KNbO3, KNbO3[11̄0]//SrTiO3[010], [01̄0], [001] or [001̄] which gives rise to polarization at 45° to the substrate plane. In the tetragonal KNbO3 phase, KNbO3 〈100〉//SrTiO3 〈100〉, which gives rise to the polarization perpendicular to or in the substrate plane. The variation of lattice parameter with temperature was determined using in-situ X-ray diffraction measurements with temperature. The phase transitions show hysteresis of ∼10° to 25° with heating and cooling which is typical of first order transitions. The transition temperatures were determined to be in the range of 207 ± 12°C for orthorhombic-tetragonal transition and 410 ± 5°C for tetragonal-cubic transition Evidence for in-plane biaxial stresses in the high temperature ferroelectric tetragonal phase of KNbO3 is observed.

Original languageEnglish (US)
Pages (from-to)343-351
Number of pages9
JournalFerroelectrics
Volume200
Issue number1-4
DOIs
StatePublished - 1997

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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