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Title: Strain engineered barium strontium titanate for tunable thin film resonators

Piezoelectric properties of epitaxial (001) barium strontium titanate (BST) films are computed as functions of composition, misfit strain, and temperature using a non-linear thermodynamic model. Results show that through adjusting in-plane strains, a highly adaptive rhombohedral ferroelectric phase can be stabilized at room temperature with outstanding piezoelectric response exceeding those of lead based piezoceramics. Furthermore, by adjusting the composition and the in-plane misfit, an electrically tunable piezoelectric response can be obtained in the paraelectric state. These findings indicate that strain engineered BST films can be utilized in the development of electrically tunable and switchable surface and bulk acoustic wave resonators.
Authors:
;  [1] ;  [2] ; ;  [3] ;  [4] ;  [1] ;  [5]
  1. Department of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269 (United States)
  2. Department of Physics, University of Connecticut, Storrs, Connecticut 06269 (United States)
  3. Structured Materials Industries, Inc., Piscataway, New Jersey 08854 (United States)
  4. Department of Electrical and Computer Engineering, University of Colorado at Colorado Springs, Colorado Springs, Colorado 80918 (United States)
  5. (United States)
Publication Date:
OSTI Identifier:
22300220
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM COMPOUNDS; EPITAXY; FERROELECTRIC MATERIALS; NONLINEAR PROBLEMS; PIEZOELECTRICITY; RESONATORS; SOUND WAVES; STRAINS; STRONTIUM COMPOUNDS; SURFACES; TEMPERATURE RANGE 0273-0400 K; THERMODYNAMIC MODEL; THIN FILMS; TITANATES; TRIGONAL LATTICES