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Giant Negative Electrocaloric Effect in Anti-Ferroelectric (Pb0.97La0.02)(Zr0.95Ti0.05)O3 Ceramics.

ABSTRACT: A giant electrocaloric effect is reported in (Pb0.97La0.02)(Zr0.95Ti0.05)O3 anti-ferroelectric ceramics. These samples were fabricated by a solid-state mixed oxide technique. Dielectric analyses were employed to investigate the anti-ferroelectric (AFE) and ferroelectric (FE) phase transitions of the sample. During the heating process, the phase transition from the orthorhombic anti-ferroelectric phase (AFEO) to the tetragonal anti-ferroelectric phase (AFET) occurs at 155 °C, and the phase transition from AFET to PE occurs at 225 °C. Using the Maxwell relationship, the entropy change ?S and adiabatic temperature change ?T were obtained at different electric fields ranging from 40 to 65 kV/cm. The maximum adiabatic temperature change (?T max = -7.47 K) was obtained at 50 kV/cm, which was attributed to the field-induced phase transformation between the anti-ferroelectric and ferroelectric phases. These results showed that PLZT2/95/5 ceramics possess a large negative electrocaloric effect value, which could be applied in achieving cooling power as refrigerants.

SUBMITTER: Zhao YC 

PROVIDER: S-EPMC6740168 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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Giant Negative Electrocaloric Effect in Anti-Ferroelectric (Pb<sub>0.97</sub>La<sub>0.02</sub>)(Zr<sub>0.95</sub>Ti<sub>0.05</sub>)O<sub>3</sub> Ceramics.

Zhao Ying-Cheng YC   Liu Qiu-Xiang QX   Tang Xin-Gui XG   Jiang Yan-Ping YP   Li Bi B   Li Wen-Hua WH   Luo Li L   Guo Xiao-Bin XB  

ACS omega 20190826 11

A giant electrocaloric effect is reported in (Pb<sub>0.97</sub>La<sub>0.02</sub>)(Zr<sub>0.95</sub>Ti<sub>0.05</sub>)O<sub>3</sub> anti-ferroelectric ceramics. These samples were fabricated by a solid-state mixed oxide technique. Dielectric analyses were employed to investigate the anti-ferroelectric (AFE) and ferroelectric (FE) phase transitions of the sample. During the heating process, the phase transition from the orthorhombic anti-ferroelectric phase (AFE<sub>O</sub>) to the tetragonal anti  ...[more]

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