The effect of Fe substitution on pyroelectric properties of 0.62Pb(Mg1/3Nb2/3)O-3-0.38PbTiO(3) single crystals

Chew, Khian Hooi and Luo, H.S. and Wan, X.M. and Chan, H.L.W. and Choy, C.L. and Zhao, X.Y. (2005) The effect of Fe substitution on pyroelectric properties of 0.62Pb(Mg1/3Nb2/3)O-3-0.38PbTiO(3) single crystals. Journal of Applied Physics, 97 (6). ISSN 0021-8979, DOI

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Fe-doped 0.62Pb(Mg1/3Nb2/3)O-3-0.38PbTiO(3) (PMN-0.38PT) single crystals with two different dopant concentrations, 0.2 and 1.0 mol %, were grown by a modified Bridgman technique. The effect of Fe substitution on dielectric and pyroelectric properties was examined. The dielectric constant of the 0.2 mol % Fe-doped PMN-0.38PT single crystal was controlled successfully, indicating the possibility of tuning the dielectric properties by doping with a small concentration of iron ions. The mechanism of doping effect was also discussed based on the principles of crystal chemistry. The pyroelectric response of the single crystals was measured using a dynamic method from 20 to 50 degrees C. Compared with the 1.0 mol % Fe-doped single crystal, the 0.2 mol % Fe-doped sample possesses the better pyroelectric properties. At room temperature, the pyroelectric coefficient and detectivity figure of merit (F-D) for the 0.2 mol % Fe-doped sample are 568 mu C/m(2) K and 53 mu Pa-1/2, respectively, and they increase slightly with temperature increasing. These excellent pyroelectric properties as well as being able to produce large-size and high-quality single crystals make this kind of single crystal a promising candidate for high-performance infrared detectors and other pyroelectric applications. (C) 2005 American Institute of Physics.

Item Type: Article
Additional Information: Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA
Uncontrolled Keywords: Sinusoidal temperature waves, Dielectric-properties, Optical-properties, Nonpyroelectric currents, Growth
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Miss Malisa Diana
Date Deposited: 02 Aug 2013 01:13
Last Modified: 27 Aug 2019 07:34

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