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$Sr_{0.95}Pr_{0.05}TiO_{3}$ ceramic is shown to exhibit anomalous value of cubic lattice parameter at room temperature. A combination of temperature dependent dielectric and synchrotron x-ray powder-diffraction study has revealed that the anomalous lattice parameter has contribution from spontaneous electrostrictive strain that sets in below 520 K. In analogy with the lead-based classical relaxor ferroelectrics, it is suggested that Pr-doped $SrTiO_{3}$ is a new class of high-temperature lead-free relaxor ferroelectric system.

physical review. b, condensed matter and materials physics

Onset of spontaneous electrostrictive strain below 520 K in Pr-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>SrTiO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Onset of spontaneous electrostrictive strain below 520 K in Pr-dopedSrTiO3