In this work,the frequency dependence of ferroelectric and electrocaloric properties in barium titanate-based ceramics was studied based on Maxwell relations.It is found that the maximum and remnant polarization will ...In this work,the frequency dependence of ferroelectric and electrocaloric properties in barium titanate-based ceramics was studied based on Maxwell relations.It is found that the maximum and remnant polarization will decrease while the coercive field increases a lot with rising frequency from 0.1 to 10 Hz,indicating that polarization rotation and domain switching become difficult at high frequencies.The electrocaloric properties show the different frequency dependence at different phase structures.Isothermal entropy change(ΔS)and adiabatic temperature change(ΔT)are similar around/above Curie temperature(TCT,showing tiny frequency dependence.However,ΔS andΔT display the obvious frequency dependence below T_(C),especially in the orthorhombic–tetragonal phase-transition region with a stable ferroelectric phase,and this frequency dependence becomes more obvious under a low-electric field.It is also found that increasing the frequency can weaken the electric field dependence of electrocaloric strength.This work gives a general profile of frequency dependence for electrocaloric properties in ferroelectric ceramics.展开更多
基金support of the National Natural Science Foundation of China(Nos.12204104,12104093,52102126 and 52072075)the Natural Science Foundation of Fujian Province(Nos.2021J05122,2021J05123,2022J01087,2022J01552 and 2023J01259)Qishan Scholar Financial Support from Fuzhou University(No.GXRC-20099).
文摘In this work,the frequency dependence of ferroelectric and electrocaloric properties in barium titanate-based ceramics was studied based on Maxwell relations.It is found that the maximum and remnant polarization will decrease while the coercive field increases a lot with rising frequency from 0.1 to 10 Hz,indicating that polarization rotation and domain switching become difficult at high frequencies.The electrocaloric properties show the different frequency dependence at different phase structures.Isothermal entropy change(ΔS)and adiabatic temperature change(ΔT)are similar around/above Curie temperature(TCT,showing tiny frequency dependence.However,ΔS andΔT display the obvious frequency dependence below T_(C),especially in the orthorhombic–tetragonal phase-transition region with a stable ferroelectric phase,and this frequency dependence becomes more obvious under a low-electric field.It is also found that increasing the frequency can weaken the electric field dependence of electrocaloric strength.This work gives a general profile of frequency dependence for electrocaloric properties in ferroelectric ceramics.
