Bipolar electro-caloric effect in SrxBa(1−x)Nb2O6 lead-free ferroelectric single crystal Indranil Bhaumik, S. Ganesamoorthy, R. Bhatt, A. K. Karnal, P. K. Gupta, S. Takekawa and K. Kitamura EPL, 107 4 (2014) 47001 Published online: 04 August 2014 DOI: 10.1209/0295-5075/107/47001