Electric-field-dependent phase volume fractions and enhanced piezoelectricity near the polymorphic phase boundary of (K0.5Na 0.5)1-xLixNbO3 textured ceramics

Wenwei Ge, Jiefang Li, D. Viehland, Yunfei Chang, Gary L. Messing

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Abstract

The structure, ferroelectric and piezoelectric properties of 001 textured (K0.5Na0.5)0.98Li0.02NbO 3 ceramics were investigated as a function of temperature and dc bias E. X-ray diffraction revealed an orthorhombic (O) → tetragonal (T) polymorphic phase boundary (PPB). Phase coexistence was found near the PPB over a 30 °C temperature range, where the relative phase volume fractions changed with temperature. Furthermore, increasing E applied along the 001 texture direction resulted in a notable increase in the volume fraction of the T phase at the expense of the O phase, effectively shifting the O → T boundary to lower temperature. An enhancement in the piezoelectric properties was found to accompany this increase in the T volume fraction.

Original languageEnglish (US)
Article number224110
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number22
DOIs
StatePublished - Jun 24 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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