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

Journal Article · Mon Sep 15 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4896044· OSTI ID:22303528

Upadhyay, Sanjay Kumar; Bag, Pallab; Rawat, R. ^[1]; Gupta, S. M. ^[2]; Gupta, Ajay ^[3]

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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)

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.

• OSTI ID: 22303528
• Journal Information: Applied Physics Letters, Vol. 105, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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