Unconventional high permittivity and relaxor like anomaly in (Sr, Ce, Pr)TiO3 solid solution
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In this study, non-stoichiometric solid solution, Sr1–1.5(x+y)CexPryTiO3 abbreviated as (Sr, Ce, Pr)TiO3 (with 0.05 ≤ x ≤ 0.35 and y = 0.05, sintered in N2/H2 with 99% N2 and 1% H2) were prepared via a conventional solid-state method. By introducing (Ce0.25Pr0.05)3+/4+ on the A-site, the structure symmetry of the ceramic could be reduced, confirming cubic to tetragonal phase transition. Using Rietveld refinement and electron diffraction (TEM), the tetragonal phase was assigned to P4/mmm space group which posses a center of symmetry (centrosymmetric tetragonal unit cell). A small opening of hysteresis loop at higher Ce doping is assumed to be a caused by defect dipoles and conductivity. The dielectric anomalies were observed in all compositions, therefore, we assume that they are not related to structural phase transition but rather to some conductivity processes.
This fundamental research work was supported by the Higher Education Commission of Pakistan under initial start-up research grant program (21-2106/SRGP/R&D/HEC/2018) and the European Union’s Horizon 2020 research and innovation program under the Marie Skłodow-ska-Curie Grant Agreement No. 778072 and the Slovenian Research Agency under program P1-0125.
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