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Giant Negative Electrocaloric Effect in Anti-Ferroelectric (Pb0.97La0.02)(Zr0.95Ti0.05)O3 Ceramics
ACS Omega ( IF 3.7 ) Pub Date : 2019-08-26 00:00:00 , DOI: 10.1021/acsomega.9b02149
Ying-Cheng Zhao 1 , Qiu-Xiang Liu 1 , Xin-Gui Tang 1 , Yan-Ping Jiang 1 , Bi Li 1 , Wen-Hua Li 1 , Li Luo 1 , Xiao-Bin Guo 1
ACS Omega ( IF 3.7 ) Pub Date : 2019-08-26 00:00:00 , DOI: 10.1021/acsomega.9b02149
Ying-Cheng Zhao 1 , Qiu-Xiang Liu 1 , Xin-Gui Tang 1 , Yan-Ping Jiang 1 , Bi Li 1 , Wen-Hua Li 1 , Li Luo 1 , Xiao-Bin Guo 1
Affiliation
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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 ΔS and adiabatic temperature change ΔT were obtained at different electric fields ranging from 40 to 65 kV/cm. The maximum adiabatic temperature change (ΔTmax = −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.
中文翻译：
铁磁（Pb 0.97 La 0.02）（Zr 0.95 Ti 0.05）O 3陶瓷中的巨大负电热效应
在（Pb 0.97 La 0.02）（Zr 0.95 Ti 0.05）O 3反铁电陶瓷中报道了巨大的电热效应。这些样品是通过固态混合氧化物技术制造的。使用介电分析来研究样品的反铁电（AFE）和铁电（FE）相变。在加热过程中，从斜方反铁电相（AFE O）到四方反铁电相（AFE T）的相变在155°C发生，从AFE T到PE的相变在225°C发生。使用麦克斯韦关系，熵变ΔS在40至65kV / cm的不同电场下获得绝热温度变化ΔT和绝热温度变化ΔT。在50 kV / cm处获得最大绝热温度变化（ΔT max = -7.47 K），这归因于反铁电相与铁电相之间的场致相变。这些结果表明，PLZT2 / 95/5陶瓷具有较大的负热效应值，可用于实现制冷剂的冷却能力。
更新日期：2019-08-26
中文翻译：
铁磁（Pb 0.97 La 0.02）（Zr 0.95 Ti 0.05）O 3陶瓷中的巨大负电热效应
在（Pb 0.97 La 0.02）（Zr 0.95 Ti 0.05）O 3反铁电陶瓷中报道了巨大的电热效应。这些样品是通过固态混合氧化物技术制造的。使用介电分析来研究样品的反铁电（AFE）和铁电（FE）相变。在加热过程中，从斜方反铁电相（AFE O）到四方反铁电相（AFE T）的相变在155°C发生，从AFE T到PE的相变在225°C发生。使用麦克斯韦关系，熵变ΔS在40至65kV / cm的不同电场下获得绝热温度变化ΔT和绝热温度变化ΔT。在50 kV / cm处获得最大绝热温度变化（ΔT max = -7.47 K），这归因于反铁电相与铁电相之间的场致相变。这些结果表明，PLZT2 / 95/5陶瓷具有较大的负热效应值，可用于实现制冷剂的冷却能力。
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