Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12493
Title: Piezoelectric and pyroelectric properties of Cu-doped CaBi4Ti4O15 lead-free ferroelectric ceramics
Authors: Kwok, KW 
Wong, HY
Issue Date: 2009
Source: Journal of physics. D, Applied physics, 2009, v. 42, no. 9, e5415
Abstract: Dense Cu-doped CaBi4Ti4O15 ferroelectric ceramics have been fabricated by a conventional ceramic technique. After doping by Cu, the ceramics become denser, and their electrical, piezoelectric and pyroelectric properties are improved. At the optimum doping level of 0.5 mol%, the ceramic exhibits a high density (6940 kg m(-3)), a low dielectric constant (145), a low dielectric loss (0.12%), a high resistivity (2.5 x 10(13) Omega cm), a large piezoelectric coefficient (12.4 pC N-1) and a large pyroelectric coefficient (86 mu CK-1 m(-2)). Unlike the piezoelectric properties, the pyroelectric properties, in particular those relating to the pyroelectric detection, of the ceramics are good and comparable to those of the lead-based ferroelectric ceramics. For the ceramic doped with 0.5 mol% Cu, the voltage and detectivity figures of merit for pyroelectric detection have large values of 2.6 x 10(-2) m(2) C-1 and 2.7 x 10(-5) Pa-1/2, respectively, indicating that it is a promising candidate for pyroelectric applications.
Publisher: Institute of Physics Publishing
Journal: Journal of physics. D, Applied physics 
ISSN: 0022-3727
EISSN: 1361-6463
DOI: 10.1088/0022-3727/42/9/095419
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