The dielectric and pyroelectric performances of 91.5Na_(0.5)Bi_(0.5)TiO_(3)-8.5K_(0.5)Bi_(0.5)TiO_(3)lead-free single crystal were investigated.The depolarization temperature of the crystal is about 153°C.Among t...The dielectric and pyroelectric performances of 91.5Na_(0.5)Bi_(0.5)TiO_(3)-8.5K_(0.5)Bi_(0.5)TiO_(3)lead-free single crystal were investigated.The depolarization temperature of the crystal is about 153°C.Among the<001>,<110>,and<111>crystallographic orientations,the<111>-oriented crystal possesses the highest pyroelectric coefficient and the largest figures of merit,and the values of p,Fv,and Fd are 5.63×10^(−4)C/m^(2)·K,0.06 m^(2)/C,and 21.5μPa−1/2 for the<111>-oriented crystal at room temperature.The Fd and Fv exhibit weak frequency dependence in the range of 100-300 Hz.With the increase of the temperature,the value of p increases,while the value of Fv decreases from 18°C to 103°C.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(NSFC Grant No.51601101)Natural Science Foundation of Ningbo(Grant No.202003N4165).
文摘The dielectric and pyroelectric performances of 91.5Na_(0.5)Bi_(0.5)TiO_(3)-8.5K_(0.5)Bi_(0.5)TiO_(3)lead-free single crystal were investigated.The depolarization temperature of the crystal is about 153°C.Among the<001>,<110>,and<111>crystallographic orientations,the<111>-oriented crystal possesses the highest pyroelectric coefficient and the largest figures of merit,and the values of p,Fv,and Fd are 5.63×10^(−4)C/m^(2)·K,0.06 m^(2)/C,and 21.5μPa−1/2 for the<111>-oriented crystal at room temperature.The Fd and Fv exhibit weak frequency dependence in the range of 100-300 Hz.With the increase of the temperature,the value of p increases,while the value of Fv decreases from 18°C to 103°C.
