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Grain-size-induced Relaxor Ferroelectric Phase Transition in SrBi_2Ta_2O_9 Nanoparticles

Grain-size-induced Relaxor Ferroelectric Phase Transition in SrBi_2Ta_2O_9 Nanoparticles
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摘要 The transition from paraelectric phase to ferroelectric phase for SrBi2Ta2O9(SBT) nanoparticles has been investigated by high-temperature X-ray diffraction,temperature-dependent dielectric and specific heat measurements.The crystal structure of SBT nanoparticles at room temperature is orthogonal with an A21am symmetry.The high-temperature phase(>350 ℃) exhibits a tetragonal structure(I4/mmm).There are two anomalies in all samples of SBT nanoparticles from the dielectric and specific heat curves.The high-temperature anomaly is frequency-dependent,which is a typical characteristic of relaxor ferroelectric phase transition.However,the low-temperature anomaly is heating-rate dependent,which is related to structural relaxation.These two phase transitions are accompanied with the changes in local symmetry,which is related to disordered atoms that are induced by size effects in SBT nanoparticles. The transition from paraelectric phase to ferroelectric phase for SrBi2Ta2O9(SBT) nanoparticles has been investigated by high-temperature X-ray diffraction,temperature-dependent dielectric and specific heat measurements.The crystal structure of SBT nanoparticles at room temperature is orthogonal with an A21am symmetry.The high-temperature phase(>350 ℃) exhibits a tetragonal structure(I4/mmm).There are two anomalies in all samples of SBT nanoparticles from the dielectric and specific heat curves.The high-temperature anomaly is frequency-dependent,which is a typical characteristic of relaxor ferroelectric phase transition.However,the low-temperature anomaly is heating-rate dependent,which is related to structural relaxation.These two phase transitions are accompanied with the changes in local symmetry,which is related to disordered atoms that are induced by size effects in SBT nanoparticles.
作者 柯华
出处 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第S1期20-23,共4页 武汉理工大学学报(材料科学英文版)
基金 Funded by Development Program for Outstanding Young Teachers in Harbin Institute of Technology (HIT,HITQNJS.2007.012) The Natural Scientific Research Innovation Foundation in HIT (HIT.NSRIF.2008.35) the Heilongjiang Postdoctorial Fund (No.LBH-Z06100)
关键词 SrBi2Ta2O9 Phase transition NANOPARTICLES SrBi2Ta2O9 Phase transition nanoparticles
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参考文献15

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