热电性
陶瓷
材料科学
热电晶体
响应度
功勋
电介质
光电子学
比探测率
锆钛酸铅
钛酸铅
复合材料
铁电性
光电探测器
作者
Sing Lau,Chun-Der Cheng,S. H. Choy,Dunmin Lin,K. W. Kwok,H. L. W. Chan
摘要
The use of lead-free materials has recently become a very important issue in environmental protection of the earth. Two groups of lead-free ceramics, (K0.5,Na0.5)NbO3 based (KNN) and Bi1−y(NaxK1−x)yTiO3 based (BNKT), were studied for their thermal, dielectric, and pyroelectric properties as candidates for pyroelectric sensor applications. The BNKT-based ceramic, [Bi0.5(Na0.94K0.05Li0.016)0.5]0.95Ba0.05TiO3 (BNKLBT), shows excellent pyroelectric properties when compared with KNN-based ceramic and lead zirconate titanate. Its properties were measured as follows: pyroelectric coefficient p=360μC∕m2K, pyroelectric figure of merit of current, voltage, and detectivity Fi=221pm∕V, Fv=0.030m2∕C, and Fd=14.8μPa−1∕2. With these outstanding pyroelectric properties, the BNKLBT ceramic can be a promising material for pyroelectric sensor applications. The BNKLBT ceramic with different thicknesses (i.e., 0.3, 0.5, and 0.7mm) have been used as the sensing element for fabricating infrared detectors. The current responsivity of the sensors was evaluated as functions of frequency.
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