The electrocaloric effect in lead-free K0.5Na 0.5NbO3-SrTiO3 ceramics

B. Rožič*, J. Koruza, Z. Kutnjak, G. Cordoyiannis, B. Malič, M. Kosec

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


Direct measurements of the electrocaloric effect (ECE) in bulk lead-free relaxor K0.5Na0.5NbO3-SrTiO3 (KNN-STO) ceramics sintered in air have been performed by using electrocaloric thermometry, i.e., a high-resolution calorimetry with a small modification to the experimental setup and software. The obtained results confirm the existence of a large ECE in this material in the vicinity of the ferroelectric phase transition, where the electrocaloric temperature change ΔTEC around 0.5 K was achieved under a field of 80 kV/cm. At room temperature ΔTEC is comparable with that observed in lead-based ceramic materials, so far the most studied electrocaloric materials, which, however, are less environmentally friendly due to the toxicity of lead.

Original languageEnglish
Pages (from-to)39-45
Number of pages7
Issue number1
Publication statusPublished - 2013
Externally publishedYes
Event11th European Conference on Applications of Polar Dielectrics, ECAPD 2012 - Aveiro, Portugal
Duration: 9 Jul 201213 Jul 2012


  • Electrocaloric effect
  • Lead-free ceramics
  • Relaxor ferroelectric

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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