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Title: Electro-caloric effect in lead-free Sn doped BaTiO{sub 3} ceramics at room temperature and low applied fields

Structural, dielectric, ferroelectric (FE), {sup 119}Sn Mössbauer, and specific heat measurements of polycrystalline BaTi{sub 1–x}Sn{sub x}O{sub 3} (x = 0% to 15%) ceramics are reported. Phase purity and homogeneous phase formation with Sn doping is confirmed from x-ray diffraction and {sup 119}Sn Mössbauer measurements. With Sn doping, the microstructure is found to change significantly. Better ferroelectric properties at room temperature, i.e., increased remnant polarization (38% more) and very low field switchability (225% less) are observed for x = 5% sample as compared to other samples and the results are explained in terms of grain size effects. With Sn doping, merging of all the phase transitions into a single one is observed for x ≥ 10% and for x = 5%, the tetragonal to orthorhombic transition temperature is found close to room temperature. As a consequence better electro-caloric effects are observed for x = 5% sample and therefore is expected to satisfy the requirements for non-toxic, low energy (field) and room temperature based applications.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001 (India)
  2. Ceramic Laboratory, LMDDD, RRCAT, Indore 452013 (India)
  3. Amity Center for Spintronic Materials, Amity University, Noida 201303 (India)
Publication Date:
OSTI Identifier:
22303528
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 11; 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 COMPOUNDS; CERAMICS; DOPED MATERIALS; FERROELECTRIC MATERIALS; GRAIN SIZE; MOESSBAUER EFFECT; ORTHORHOMBIC LATTICES; PHASE TRANSFORMATIONS; POLARIZATION; POLYCRYSTALS; SPECIFIC HEAT; TEMPERATURE RANGE 0273-0400 K; TIN 119; TIN ADDITIONS; TITANATES; TRANSITION TEMPERATURE; X-RAY DIFFRACTION