TY - JOUR
T1 - The electrocaloric effect in lead-free K0.5Na 0.5NbO3-SrTiO3 ceramics
AU - Rožič, B.
AU - Koruza, J.
AU - Kutnjak, Z.
AU - Cordoyiannis, G.
AU - Malič, B.
AU - Kosec, M.
N1 - Funding Information:
This work was supported by the Slovenian Research Agency under program P1–0125 and project J1-2015 and by the Centre of Excellence Namaste. George Cordoyiannis acknowledges the support of the Project PE3–1535 (Action “Supporting Postdoctoral Researchers” of the Operational Program “Education and Lifelong Learning”, co-financed by the European Social Fund and the Greek State). Brigita Rozˇicˇ thanks to L’OREAL, Slovenian National commission for UNESCO and Slovenian Science Foundation for a national fellowship “Women in Science 2012”.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
KW - Electrocaloric effect
KW - Lead-free ceramics
KW - Relaxor ferroelectric
UR - http://www.scopus.com/inward/record.url?scp=84888594379&partnerID=8YFLogxK
U2 - 10.1080/00150193.2013.820996
DO - 10.1080/00150193.2013.820996
M3 - Conference article
AN - SCOPUS:84888594379
SN - 0015-0193
VL - 446
SP - 39
EP - 45
JO - Ferroelectrics
JF - Ferroelectrics
IS - 1
T2 - 11th European Conference on Applications of Polar Dielectrics, ECAPD 2012
Y2 - 9 July 2012 through 13 July 2012
ER -