溶胶–凝胶法制备BNBT系陶瓷的热释电性能

Pyroelectric Properties of (Bi_(0.5)Na_(0.5))_(1-x)Ba_xTiO_3 Lead-free Ceramics by Sol-gel Method

研究了采用溶胶–凝胶工艺制备的(Bi0.5Na0.5)1xBaxTiO3(x=0,0.06,0.08)系(简称BNBT)无铅压电陶瓷的热释电性能。研究发现该工艺制备的(Bi0.5Na0.5)1xBaxTiO3系陶瓷室温附近具有较强的热释电性,热释电系数P大大高于传统工艺制备的同种样品的性能。随着Ba离子浓度的增加,热释电系数P在x=0.06时达到最大,P为3.9104 Cm2·K1。溶胶–凝胶工艺制备的(Bi0.5Na0.5)1xBaxTiO3系陶瓷具有较大热释电系数,起因于该类材料压电性较强、退极化温度较低。

The pyroelectric properties of (Bi0.5Na0.5)1xBaxTiO3 (x=0, 0.06, 0.08) ceramics prepared by sol-gel method were investigated. These ceramics showed enhanced pyroelectric coefficient than those prepared by conventional synthesized method. The (Bi0.5Na0.5)0.94Ba0.06TiO3 ceramic showed the largest pyroelectric coefficient P=3.9104Cm2·K1 at room-temperature in this system. The increased piezoelectric constant and decreased depolarization temperature can explain the large pyroelectric coefficient of these materials.