【摘 要】
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Large pyroelectric and energy harvesting properties have been attracting increasing attentions due to the practical applications in infrared detectors and energy harvesting technologies.Ferroelectric-antiferroelectric(FE-AFE)phase transitions are usually
【机 构】
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College of Chemistry,Fuzhou University,Fuzhou 350116,China;Key Laboratory of Optoelectronic Material
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Large pyroelectric and energy harvesting properties have been attracting increasing attentions due to the practical applications in infrared detectors and energy harvesting technologies.Ferroelectric-antiferroelectric(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(Lu1/2Nb1/2)O3-PbTiO3(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 temperature-dependent macrodomain structure,DSC curves and dielectric properties.Obviously,PLN-PT crystals display excellent peak pyroelectric coefficient(～6.8 μC/(cm2·K))with a maximum depolarization tem-perature 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.
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