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K around the transition temperature. In order to determine precisely the structure at high and low temperatures, Rietveld refinements of a complete 2θ range were performed on the patterns collected below and above the transition temperature either for PLT20 or PLT30. The temperature dependence of the relative dielectric permittivity was also performed. From the final Rietveld refinements it was observed important structural trends and it was possible to determine the range where the ferroelectric-to-paraelectric phase transition takes place. The results observed with the XRD refinements agree with that one observed by electric measurements. Structural details, in terms of short and long-range order, are presented and the correlation between the XRD and XANES/EXAFS data is discussed.

Structural aspects of the effect of NaNbO3substitution on quantum paraelectric behavior of CaTiO3

Structural aspects of the effect of NaNbO₃substitution on quantum paraelectric behavior of CaTiO₃