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Title: Piezoelectricity above the Curie temperature? Combining flexoelectricity and functional grading to enable high-temperature electromechanical coupling

Most technologically relevant ferroelectrics typically lose piezoelectricity above the Curie temperature. This limits their use to relatively low temperatures. In this Letter, exploiting a combination of flexoelectricity and simple functional grading, we propose a strategy for high-temperature electromechanical coupling in a standard thin film configuration. We use continuum modeling to quantitatively demonstrate the possibility of achieving apparent piezoelectric materials with large and temperature-stable electromechanical coupling across a wide temperature range that extends significantly above the Curie temperature. With Barium and Strontium Titanate, as example materials, a significant electromechanical coupling that is potentially temperature-stable up to 900 °C is possible.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Department of Mechanical Engineering, University of Houston, Houston, Texas 77204 (United States)
  2. Department of Mathematics, Southwestern University, Georgetown, Texas 78626 (United States)
  3. Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
  4. Department of Mechanical Engineering and Department of Physics, University of Houston, Houston, Texas 77204 (United States)
Publication Date:
OSTI Identifier:
22258609
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM; COUPLING; CURIE POINT; FERROELECTRIC MATERIALS; PIEZOELECTRICITY; STRONTIUM; THIN FILMS; TITANATES