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Relaxor behavior an...
Relaxor behavior and electrothermal properties of Sn- And Nb-modified (Ba,Ca)TiO3 Pb-free ferroelectric
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- Venkateshwarlu, Sarangi (author)
- City University of Hong Kong
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- Nayak, Sanjib (author)
- City University of Hong Kong
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- Marlton, Frederick P. (author)
- Aarhus University
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- Weyland, Florian (author)
- Technical University of Darmstadt
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- Novak, Nikola (author)
- Jožef Stefan Institute
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- Maurya, Deepam (author)
- Virginia Polytechnic Institute and State University
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- Veerabhadraiah, Yashaswini (author)
- City University of Hong Kong
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- Borkiewicz, Olaf (author)
- Argonne National Laboratory
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- Beyer, Kevin A. (author)
- Argonne National Laboratory
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- Jørgensen, Mads R.V. (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Aarhus University
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- Pramanick, Abhijit (author)
- City University of Hong Kong
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(creator_code:org_t)
- 2020-02-10
- 2020
- English 11 s.
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In: Journal of Materials Research. - : Springer Science and Business Media LLC. - 0884-2914 .- 2044-5326. ; 35:8, s. 1017-1027
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Abstract
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- Relaxor ferroelectrics have drawn attention for possible applications in solid-state cooling and thermal energy harvesting, owing to their electrothermal energy conversion properties. Here, we have synthesized and characterized the structure-property correlations of a new Sn- and Nb-doped (Ba,Ca)TiO3 relaxor ferroelectric with large pyroelectric and electrocaloric effects over a broad temperature range. We observed two peaks for the temperature-dependent pyroelectric coefficient: (i) -(δP/δT) ∼ 563 μC/(m2 K) at T ∼ 270 K and (ii) -(δP/δT) ∼ 1021 μC/(m2 K) at T ∼ 320 K. In addition, a broad peak for electrocaloric temperature change is observed near 320 K with a relative cooling power of 1/417 J/kg. These properties could be correlated to structural changes observed using X-ray diffraction at two different temperature ranges in the material. Analysis of high-energy X-ray scattering and specific heat capacity data revealed a transition from the cubic to tetragonal phase near Tm ∼ 320 K, whereas an additional increase in the tetragonality (c/a) of the polar phase is observed below Ts ∼ 270 K.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- electrical properties
- ferroelectric
- X-ray diffraction
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- ref (subject category)
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Venkateshwarlu, ...
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Nayak, Sanjib
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Marlton, Frederi ...
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Weyland, Florian
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Novak, Nikola
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Maurya, Deepam
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Veerabhadraiah, ...
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Borkiewicz, Olaf
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Beyer, Kevin A.
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Jørgensen, Mads ...
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Pramanick, Abhij ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
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Journal of Mater ...
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Lund University