Multicaloric effect in ferroelectric PbTiO3from first principles

Some strategies for improving caloric responses with ferroelectrics

“…57 This definition not only has enlarged the initial Vopson's definition 58 but also has taken into account recent state-of-the-art findings especially during the past 3 years. 18,59 Due to couplings between different ferroic orders, the multicaloric effect may be larger than either single caloric effect. Multicaloric effect may also lead to search for hitherto unobserved caloric effect in ferroics 5 (e.g., elastocaloric effects in ferroelectrics 18,20,60 ) or tuning and optimizing of one single caloric effect in multiferroic materials by using a non-conjugated field (e.g., electrocaloric effect with stress 21 ).…”

Influence of epitaxial strain on elastocaloric effect in ferroelectric thin films

“…4 On one hand, ferroelastic shape memory alloys are most intensively studied and promising elastocaloric materials due to their excellent superelasticity and broad operational temperature window. [5][6][7][8][9] On the other hand, ferroelastic ferroelectric bulk and thin films are predicted to have remarkable elastocaloric properties comparable with ferroelastic martensites, [10][11][12] which further expands the elastocaloric family.…”

“…Note that 6.9 K is indeed in the range of temperature changes for other elastocaloric systems reported in the literature. [2][3][4][5][6][7][8][9][10][11] Moreover, due to the second-order nature of the phase transition, it is expected that the hysteresis loss and irreversibilities associated with latent heat vanish, which is of importance to enhance refrigerant efficiency. 5,12,13 In addition, the system can operate in a wide temperature window for all compressive substrates we investigated (see, e.g., the 60 K FIG.…”

Frontiers in strain-engineered multifunctional ferroic materials

“…[118,121] Based on first principles studies of PbTiO 3 , it was predicted that the multicaloric effect could far exceed either the electrocaloric or elastocaloric effects. [122] In turn, future heterostructure design concepts must be chosen to leverage (or at least consider) these secondary effects. In a similar vein, researchers have sought routes to engineering multicaloric responses using magnetoelectric coupling in multiferroic materials/ heterostructures where application of either electric or magnetic fields can couple to both ferroic order parameters (ferroelectric and ferromagnetic).…”