Abstract
To develop a high-performance pyroelectric infrared detector, large-size and high-quality 0.2 mol % Fe-doped Pb(Mg1/3Nb2/3)O3-0.38PbTiO3 single crystals have been grown by a modified Bridgman technique with a seed crystal. At 50 Hz, the doped single crystal showed a lower dielectric constant of 310 compared with the pure one. A low dielectric loss of 0.0067 was also obtained by doping with small concentration of iron ions. Piezoelectric coefficient (d33) of 〈001〉 oriented sample was ∼260 pC/N. The pyroelectric properties and their temperature dependence were measured by the dynamic technique. At room temperature, the pyroelectric coefficient and calculated detectivity figure of merit FD are 568 μC/m2 K and 53 μPa−1/2, respectively. The values of current response figure of merit Fi and voltage response figure of merit Fv are 227.2 pm/V and 0.083 m2/C, respectively. These excellent pyroelectric properties as well as being able to produce large-size and high-quality single crystals make this kind of single crystal very promising for high-performance infrared detectors and other pyroelectric applications.
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