Pb-DOPING EFFECTS ON THE DIELECTRIC AND PYROELECTRIC PROPERTIES OF (Sr,Pb)TiO₃ SYSTEM

Abstract

Lead strontium titanate ( Sr 1-x Pb x) TiO 3 (0.20 ≤ x ≤ 0.45,step = 0.05) ceramics were prepared by conventional mixed oxide method. The X-ray diffraction patterns indicate that the prepared samples have perovskite-type structure. With the increase of Pb content, there is a tendency from the cubic to tetragonal structure. The scanning electron microscopy micrographs reveal that the addition of Pb can affect microstructure. The dependent temperature dielectric permittivity and dielectric loss were investigated in the frequency range from 100 Hz to 1 MHz. The maximum peak of the dielectric permittivity versus temperature curve was broadened and a frequency dispersion of the dielectric permittivity was observed for the (Sr0.8Pb0.2)TiO3 ceramics. The results obtained at the frequency of 10 kHz reveal the Curie temperature linearly increased with the lead content. The fitted curves of temperature versus inverse dielectric permittivity at 10 kHz for ( Sr 1-x Pb x) TiO3 ceramics are consistent with Curie–Weiss law. The Pyroelectric properties were also investigated. The high pyroelectric coefficients and figure of merits indicate that the SPT ceramics are potential materials for pyroelectric sensors.

Pyroelectric energy harvesting and ferroelectric properties of PbxSr1-xTiO3 ceramics

“…T m increases as the content of Pb 2+ ions doping increases, which can be attributed to the decrease of symmetry of the PST matrix with more Pb 2+ ions substitute to Sr 2+ ions. This result is consistent with that in our previous works [10]. Compared to our previous works, we lower the sintering temperature to 1200°C for further decreasing the evaporation of Pb element in this study.…”

“…Because PST materials show large dielectric constant at the vicinity of T c ,, it is treated as one of the most worth-studying materials for electronic and microelectronic applications [6][7][8][9]. Our groups previously revealed PST (0.20 ≤ x ≤ 0.45) ceramics have high pyroelectric coefficients, which are potential materials for pyroelectric sensors [10]. Ferroelectrics (FEs) have been widely studied in energy harvesting applications because they have both piezoelectric and pyroelectric properties which are promising to convert ambient vibrations or heat fluctuations into electrical energy [11][12][13].…”

Dielectric relaxation and pinning phenomenon of (Sr,Pb)TiO3 ceramics for dielectric tunable device application

“…The reason may be that the concentration of PbTiO 3 (ferroelectric phase) in SPT35 is much lower than that of SPT55. Moreover, on increasing the Pb/Sr ratio, the Curie temperature T C increases gradually101619. So the ferroelectric phase of SPT35 is much smaller than that of SPT55 at the same temperature, and this case may also result in a thin loop.…”

“…Strontium lead titanate ceramics (Sr 1- x Pb x TiO 3 with x  = 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, abbreviated as SPT100 x ) were prepared by a conventional solid-state reaction technique19. Reagent-grade Pb 3 O 4 , SrCO 3 and TiO 2 powders were weighted according to their stoichiometric composition.…”

“…(Sr,Pb)TiO 3 is a promising material in the applications of dielectric tunability and pyroelectricity16171819. Recently, Liu et al .…”