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Energy Storage and Strain Property of (Bi_(0.5)Na_(0.5))_(0.935)Ba_(0.065)TiO_3-xBiScO_3 Ceramics

LIU Guo-Bao;WANG Hua;XIE Hang;PANG Si-Jian;ZHOU Chang-Rong;XU Ji-Wen;School of Materials Science and Engineering, Guilin University of Electronic Technology;Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology;  
(1-x)(Bi_(0.5)Na_(0.5))_(0.935)Ba_(0.065)TiO_3-x BiScO_3(BNBT-x BS)lead-free ceramics were fabricated by conventional ceramic sintering process and modified by BiScO_3.Effects of BiScO_(3 )content on microstructure,energy storage,field-induced strain and dielectric properties of BNBT-x BS ceramics were investigated.The results indicated that the structure of BNBT-x BS ceramics without impurity phase transferred from the co-existence phase of rhombohedral and tetragonal phase to pseudo-cubic phase.Average grain size of BNBT-x BS ceramics grew slightly with increment of doping content.The long-range ferroelectric order of BNBT-x BS ceramics was destroyed by BiScO_3,which resulted in weak polarization.Meanwhile,the phase transition of BNBT-x BS ceramics was observed from a typical ferroelectric phase to relaxor phase.BiScO_3 dopants improved energy storage and strain performance of ceramics as well,whose maximum energy storage density and high strain were 0.46 J/cm~3 and 0.25%at 70 kV/cm.The dielectric constant decreased with doping content increasing.Relaxor ferroelectric characteristics were also verified by temperature-dependence dielectric spectra.The resistance of BNBT-x BS ceramics illustrated a negative temperature coefficient and excellent electrical insulativity below 450℃.
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