Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/541
Title: Lead-free ceramics for pyroelectric applications
Authors: Lau, ST
Cheng, CH
Choy, SH
Lin, D
Kwok, KW 
Chan, HLW 
Keywords: Bismuth compounds
Ceramics
Potassium compounds
Pyroelectric detectors
Pyroelectricity
Sodium compounds
Issue Date: 23-May-2008
Publisher: American Institute of Physics
Source: Journal of applied physics, 23 May 2008, v. 103, no. 10, 104105, p. 1-4 How to cite?
Journal: Journal of applied physics 
Abstract: 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, (K[sub 0.5],Na[sub 0.5])NbO₃ based (KNN) and Bi[sub 1−y](Na[sub x]K[sub 1−x])[sub y]TiO₃ based (BNKT), were studied for their thermal, dielectric, and pyroelectric properties as candidates for pyroelectric sensor applications. The BNKT-based ceramic, [Bi[sub 0.5](Na[sub 0.94]K[sub 0.05]Li[sub 0.016])[sub 0.5]][sub 0.95]Ba[sub 0.05]TiO₃ (BNKLBT), shows excellent pyroelectric properties when compared with KNN-based ceramic and lead zirconate titanate. Its properties were measured as follows: pyroelectric coefficient p=360 µC/m²K, pyroelectric figure of merit of current, voltage, and detectivity F[sub i]=221 pm/V, F[sub v]=0.030 m²/C, and F[sub d]=14.8 µPa[sup −½]. 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 0.7 mm) have been used as the sensing element for fabricating infrared detectors. The current responsivity of the sensors was evaluated as functions of frequency.
URI: http://hdl.handle.net/10397/541
ISSN: 0021-8979
Rights: © 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in S.T. Lau et al., J. Appl. Phys. 103, 104105 (2008) and may be found at http://link.aip.org/link/?jap/103/104105
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