SCHEDULED MAINTENANCE
Giant room temperature elastocaloric effect of PbTiO3 ferroelectric materials with 90° domain structure
Abstract
The influence of domain structures and domain switching on the elastocaloric effect in PbTiO3 (PTO) with 90° domain structure under the applied stress field at room temperature has been studied using a phase field model. The calculation results indicate that both positive and negative elastocaloric effects can be obtained depending on the directions of the applied stress. The adiabatic temperature change (ΔTσ) almost linearly increases with increase of the applied uniaxial stress fields, and the largest value of negative ΔTσ is about −3.8 K which was obtained at the tensile stress field of about 2 GPa. Moreover, a negative ΔTσ with the magnitude of −7.2 K can be obtained by controlled polarization switching under the applied stress fields. These results provide an efficient way to obtain a large elastocaloric effect in ferroelectric materials through domain engineering at room temperature.
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