Ferroelectricity was induced in SrTiO3 by the Sr exchange for Pr ion in the A site of the perovskite ABO3-type structure. X-ray diffraction patterns show single phase crystalline structure in the SrxPr1−xTiO3 compound for x=0, 0.025, 0.050, 0.075 and 0.1 compositions. Rietveld refinement shows that the unit cell volume decreases with the increasing of Pr content as a consequence of the difference between Sr/Pr ionic radii. Furthermore, high-temperature differential thermoanalysis (DTA) displays a small anomaly at about 118 0C which is probably due to the Pr ion producing a distortion of the perovskite structure via an off-center site. This deformation in the lattice induces a measurable polar behavior of the solid solution. Dielectric permittivity (ɛ vs T) measurements display a well defined peak at about 238 0C. Furthermore, a well defined hysteresis loop at 30 0C with a remnant polarization that tends to decrease with increasing Pr concentration is observed. Both experimental results confirm the ferroelectric state induced by the Pr ion.
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The authors thank to CONACyT Project No. 40604- F and DGAPA-UNAM through and IN100903 and IN116703. We thank, E. Aparicio, M. Sainz, J. Peralta and P. Casillas for their technical help.
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Durán, A., Martínez, E., Mata, J. et al. Ferroelectricity in SrTiO3 Ceramics Induced by Pr Doping. MRS Online Proceedings Library 848, 411–416 (2004). https://doi.org/10.1557/PROC-848-FF9.19