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Title: The structural and in-plane dielectric/ferroelectric properties of the epitaxial (Ba, Sr)(Zr, Ti)O{sub 3} thin films

Epitaxial (Ba{sub 1-x}Sr{sub x})(Zr{sub 0.1}Ti{sub 0.9})O{sub 3} (BSZT, x = 0 – 0.45) thin films were deposited on (LaAlO{sub 3}){sub 0.3}(Sr{sub 2}AlTaO{sub 6}){sub 0.35} (LSAT) substrates by pulsed laser deposition. The experimental results demonstrate that the structural, dielectric, and ferroelectric properties of the BSZT thin films were greatly dependent on the strontium content. The BSZT thin films transformed from tetragonal to cubic phase when x ≥ 0.35 at room temperature. The Curie temperature and room-temperature remnant polarization decrease with increasing strontium concentration. The optimal dielectric properties were found in (Ba{sub 0.55}Sr{sub 0.45})(Zr{sub 0.1}Ti{sub 0.9})O{sub 3} thin films which is in paraelectric state, having tunability of 47% and loss tangent of 0.0338 under an electric field of 20 MV/m at 1 MHz. This suggests that BSZT thin film is a promising candidate for tunable microwave device applications.
Authors:
; ;  [1] ;  [2] ;  [1] ;  [3]
  1. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong (China)
  2. School of Materials Science and Engineering, The University of New South Wales, Sydney, New South Wales 2052 (Australia)
  3. (China)
Publication Date:
OSTI Identifier:
22304019
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 23; 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; ALUMINATES; ALUMINIUM COMPOUNDS; BARIUM COMPOUNDS; CURIE POINT; DIELECTRIC PROPERTIES; ENERGY BEAM DEPOSITION; EPITAXY; FERROELECTRIC MATERIALS; LANTHANUM COMPOUNDS; LASER RADIATION; LOSSES; POLARIZATION; STRONTIUM COMPOUNDS; SUBSTRATES; TANTALUM COMPOUNDS; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; TITANATES; ZIRCONATES