Elastocaloric Effect in PbTiO ₃ Thin Films with 180° Domain Structure: A Phase Field Study

Abstract

The elastocaloric effect of PbTiO3 thin films with 180° domain structure is studied using the phase field method. The influence of external stress σ33, misfit strain um and domain wall energy on the adiabatic temperature change (ΔTσ) at room temperature are carried out. The calculation results indicate that |Δ Tσ| increases as |σ33| or |um| increases. The largest ΔTσ value of −7.8 K is obtained at σ33 = 2 GPa and um = −0.02. Furthermore, the domain switching behaviors under different gradient coefficients are different, and finally affect the elastocaloric effect in PTO thin films. These results could provide a guide to choose the substrate and the preparation process in experiments.

Enhancing the Elastocaloric Strength by Combining Positive and Negative Elastocaloric Effects

“…Finally, we compared the thermodynamic calculation results with the elastocaloric effects of PTO, BTO, PMN-PT, BCZTO-Fe, PVDF, P(VDF-TrFE-CTFE), and MDABCO, as shown in Figure 6. [2,15,28,37,[41][42][43][44] The properties of the aforementioned materials are obtained near room temperature. It can be seen from the figure that the elastocaloric strength after applying an electric ) is only lower than that of PVDF (0.12 K MPa À1 ), and the ΔT brought by PVDF (1.8 K) is not as large as that of the device (4.1 K in Figure 5).…”

“…[ 14 ] Elastocaloric refrigeration refers to the process of obtaining the temperature (entropy) change by applying uniaxial stress under adiabatic (isothermal) conditions. [ 12,15 ] After the first discovery of huge elastocaloric effects in elastic martensite, it attracted the attention of researchers. [ 16 ]…”

“…[14] Elastocaloric refrigeration refers to the process of obtaining the temperature (entropy) change by applying uniaxial stress under adiabatic (isothermal) conditions. [12,15] After the first discovery of huge elastocaloric effects in elastic martensite, it attracted the attention of researchers. [16] The elastic shape-memory alloys have become a research hotspot and a promising material due to their excellent super-elasticity and wide operating temperature range.…”

Functional properties of ferroelectric materials based on lead zirconate-titanate and triglycine sulphate on macro- and microscale

“…За последнее время сильно выросла публикационная активность в области изучения калорических эффектов в сегнетоэлектриках и антисегнетоэлектриках [12], а также мультиферроиках [13]. В этом направлении наибольший интерес вызывают ЭКЭ [14][15][16][17][18], эластокалорический [19,20], механокалорический [21] и барокалорический [22][23][24] эффекты. Рассматривается также калорический эффект под влиянием вибраций [25] и калорические эффекты под влиянием химических реакций [26].…”