人工晶体学报2017，Vol.46Issue(10)：1965-1970,6.
(Sr0.7Bi0.2)TiO3取代BNT基无铅陶瓷的相变及储能特性
Phase Transition and Energy-storage Property of ( Sr0.7Bi0.2 ) TiO3 Substituted BNT-based Lead-free Ceramics
摘要
Abstract
Innovative binary BNT-based lead-free ceramics which is composed by (Sr0.7Bi0.2)TiO3 relaxor ferroelectric and (Bi0.5Na0.5)TiO3 ferroelectric, (1-x)(Bi0.5Na0.5)TiO3-x(Sr0.7Bi0.2)TiO3(BNT-xSBT for short, x=10mol%, 20mol%, 30mol% and 40mol%) was designed.All the BNT-xSBT ceramics were fabricated by the traditional solid-state processing route , and the effect of ( Sr0.7 Bi0.2 ) TiO3 on the structure , phase transition , ferroelectric property and energy-storage property of BNT-xSBT ceramics was investigated .The results show that BNT-xSBT ceramics exhibit pseudo-cubic phase at room temperature , and coexistence phase structure of polar rhombohedral ( R3c) and non-polar tetragonal ( P4bm) for BNT-xSBT ceramics was identified by dielectric and ferroelectric property .BNT-xSBT ceramics with co-occupied in A-site are relaxor ferroelectric, and Tm decreases with increasing of (Sr0.7Bi0.2)TiO3 content. The dielectric abnormal peak at low temperature ( Td ) derives from a slow transition which is caused by structure (rhombohedral and tetragonal) fluctuation.With increasing of (Sr0.7Bi0.2)TiO3 content, Td of BNT-xSBT ceramics decreases , tetragonal phase and non-polar nano-regions increases , resulting in weak ferroelectric property and distorted ferroelectric hysteresis loop .For x =30mol%, BNT-xSBT ceramics show a large Pmax =26.8 μC/cm2 , a small Pr =1.4 μC/cm2 , good energy storage density W=0.74 J/cm3 and energy storage efficiency η=68.5%(@70 kV/cm).关键词
BNT基无铅陶瓷/(Sr0.7Bi0.2)TiO3/相变/铁电性能/储能特性Key words
BNT-based lead-free ceramic/( Sr0.7 Bi0.2 ) TiO3/phase transition/ferroelectric property/energy-storage property分类
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何俊峰,梁山,谢帅,周诗豪,伍小军,白传玮,李阳,吴文娟..(Sr0.7Bi0.2)TiO3取代BNT基无铅陶瓷的相变及储能特性[J].人工晶体学报,2017,46(10):1965-1970,6.基金项目
四川省教育厅重点项目(16ZA0216) （16ZA0216）
成都信息工程大学大学生创新创业训练计划项目(201610621069) （201610621069）
