Ultrahigh pyroelectric effect and energy harvesting density of Pb(Lu_(1/2)Nb_(1/2))O_(3)-PbTiO_(3) crystals induced by FE-AFE phase transition  

作　　者：Lingfei Lv Manman Liu Ying Liu Zujian Wang Rongbing Su Xiaoming Yang Chao He Xifa Long 

机构地区：[1]College of Chemistry,Fuzhou University,Fuzhou 350116,China [2]Key Laboratory of Optoelectronic Materials Chemistry and Physics,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China

出　　处：《Journal of Rare Earths》2021年第12期1567-1573,I0005,共8页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(51902307,11904362,11974349);Strategic Priority Research Program of the Chinese Academy of Sciences(XDB20000000);Youth Innovation Promotion Association CAS;Science and Technology Project of Fujian Province(2020H0038,2019H0052)。

摘　　要：Large pyroelectric and energy harvesting properties have been attracting increasing attentions due to the practical applications in infrared detectors and energy harvesting technologies.Ferroelectricantiferroelectric(FE-AFE)phase transitions are usually accompanied by a sharp drop in polarization,which will lead to excellent pyroelectric properties and energy harvesting density.Therefore,FE-AFE phase boundary design is an effective strategy to develop new pyroelectric materials.In this paper,Pb(Lu_(1/2)Nb_(1/2))O_(3)-PbTiO_(3) (PLN-PT)single crystals with FE-AFE phase transitions were obtained by molten salt growth method.The temperature-induced FE-AFE phase transition was verified by temperaturedependent macrodomain structure,DSC curves and dielectric properties.Obviously,PLN-PT crystals display excellent peak pyroelectric coefficient(~6.8μC/(cm^(2)·K)with a maximum depolarization temperature of 118℃.Meanwhile,the pyroelectric energy harvesting density is as high as 2.62 J/cm3,which is much higher than other pyroelectric materials.The results reveal that the PLN-PT crystal is a promising candidate for infrared detectors and energy harvesting devices.

关 键 词：Rare earth crystals Phase transition PYROELECTRICITY Energy harvesting density 

分 类 号：O782.4[理学—晶体学] TB34[一般工业技术—材料科学与工程]