Direct and indirect electrocaloric measurements using multilayer capacitors

We report the discovery of serendipitous electrocaloric (EC) effects in commercial multilayer capacitors based on ferroelectric BaTiO 3 . Direct thermometry records ∼0.5 K changes due to 300 kV cm −1 , over a wide range of temperatures near and above room temperature. Similar results are obtained in...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2010-01, Vol.43 (3), p.032002-032002
Main Authors: Kar-Narayan, S, Mathur, N D
Format: Article
Language:English
Subjects:
Barium titanates
Capacitors
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cooling
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Domain structure
hysteresis
Exact sciences and technology
Ferroelectric materials
Ferroelectricity
Ferroelectricity and antiferroelectricity
Hysteresis loops
Multilayers
Physics
Piezoelectricity and electromechanical effects
Thermodynamics
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Summary:We report the discovery of serendipitous electrocaloric (EC) effects in commercial multilayer capacitors based on ferroelectric BaTiO 3 . Direct thermometry records ∼0.5 K changes due to 300 kV cm −1 , over a wide range of temperatures near and above room temperature. Similar results are obtained indirectly, via thermodynamic analysis of ferroelectric hysteresis loops. We compare and contrast these two results. Optimized EC multilayer capacitors could find applications in future cooling technologies.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/43/3/032002