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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 1.0mol%, were grown by a modified Bridgman technique. The effect of Fe substitution on dielectric and pyroelectric properties was examined. The dielectric constant of the 0.2mol% 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 20to50°C. Compared with the 1.0mol% Fe-doped single crystal, the 0.2mol% Fe-doped sample possesses the better pyroelectric properties. At room temperature, the pyroelectric coefficient and detectivity figure of merit (FD) for the 0.2mol% Fe-doped sample are 568μC∕m2K and 53μPa−1∕2, respectively, and they increase slightly with temperature increasing. Thes...

The effect of Fe substitution on pyroelectric properties of 0.62Pb(Mg1∕3Nb2∕3)O3–0.38PbTiO3 single crystals