Flexo/elasto-caloric effects in 0.66Pb(Mg1/3Nb2/3)O3-0.34PbTiO3 single crystal

Abstract

Flexocaloric and elastocaloric effect are investigated in a 0.66Pb(Mg1/3Nb2/3)O3-0.34PbTiO3 single crystal. The maximum flexocaloric temperature (0.43 K) and entropy (0.38 J/kg K) change are obtained at Curie temperature under a strain gradient of 5000 m−1. A peak elastocaloric temperature (1.45 K) and entropy (1.33 J/kg K) change due to strain gradient is evaluated at the Curie temperature under the applied stress of 250 MPa. 0.66Pb(Mg1/3Nb2/3)O3-0.34PbTiO3 encompasses an enormous elastic contribution to the flexocaloric effect instead of the polarization at similar stress level. The formulation used for caloric calculation is based on strong approximation and available data; therefore, further research is warranted to validate this work. © 2021 Elsevier B.V.