Elsevier

Scripta Materialia

Volume 143, 15 January 2018, Pages 5-9
Scripta Materialia

Regular article
Coexistence of negative and positive electrocaloric effect in lead-free 0.9(K0.5Na0.5)NbO3 - 0.1SrTiO3 nanocrystalline ceramics

https://doi.org/10.1016/j.scriptamat.2017.08.045Get rights and content

Abstract

The coexistence of negative and positive electrocaloric effect have been experimentally demonstrated in lead-free 0.9(K0.5Na0.5)NbO3 - 0.1SrTiO3 nanocrystalline ceramics using an indirect thermodynamic method. The electrocaloric response of − 0.85 K at 276 K and 0.43 K at 330 K were calculated at 40 kV/cm. The corresponding electrocaloric coefficient were estimated to be − 0.24 × 10 7 K·mV 1 and 0.7 × 10 7 K·mV 1 at 273 K and 333 K, respectively. A large electrical storage energy density 1.46 J/cm3 were achieved. The results indicate that materials possess a huge potential for electrocaloric refrigeration as a micro-cooler and energy storage capacity for electronic devices.

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    These authors contributed equally to this work and hence both are considered as a first author.

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