Volume 107, Number 4, August 2014
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 August 2014|
Bipolar electro-caloric effect in SrxBa(1−x)Nb2O6 lead-free ferroelectric single crystal
1 Crystal Growth Laboratory, Laser Materials Development and Devices Division, Raja Ramanna Centre for Advanced Technology - Indore 452 013, India
2 XS&CGS, CMPD, MSG, Indira Gandhi Centre for Atomic Research - Kalpakkam 603 102 India
3 Polar Domain Engineering Group, National Institute for Materials Science - Namiki, Tsukuba, Ibaraki, 305-0044, Japan
Received: 21 July 2014
Accepted: 23 July 2014
Here we report the anomalous electro-caloric effect (ECE) observed in lead-free SrxBa(1−x)Nb2O6 (, 0.61 and 0.75) ferroelectric single crystals. Temperature-dependent hysteresis measurement revealed that the spontaneous polarization of SrxBa(1−x)Nb2O6 single crystals with all the compositions under investigation decreases with a decrease in the temperature below the temperature of the dielectric maxima . As a consequence, these crystals exhibited negative electro-caloric effect at lower temperature along with the usual positive ECE above . The EC coefficient obtained near is 0.21, 0.43 and 0.28 K mm/kV for , 0.61 and 0.75 samples, respectively. The maximum values of in the negative ECE region are −1.4, −0.81 and for 50SBN, 61SBN and 75SBN, respectively.
PACS: 77.70.+a – Pyroelectric and electrocaloric effects / 77.80.Jk – Relaxor ferroelectrics / 77.80.Dj – Domain structure; hysteresis
© EPLA, 2014
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