The effect of Fe substitution on pyroelectric properties of 0.62Pb (Mg1/3Nb2/3)O3-0.38PbTi3O3 single crystals

X.M. Wan, Khian-Hooi Chew, H.L.W. Chan, C.L. Choy, X.Y. Zhao, H.S. Luo

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    Fe-doped 0.62Pb(Mg1/3Nb2/3)O3–0.38PbTiO3 (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 °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 (FD) for the 0.2 mol % Fe-doped sample are 568 μC/m2 K and 53 μPa−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.
    Original languageEnglish
    Pages (from-to)online - approx 5-20pp
    JournalJournal of Applied Physics
    Issue number6
    Publication statusPublished - 2005


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