How does substituting strontium for barium change the Curie point of barium titanate?

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Figure 1: Ferroelectric properties of barium titanate (BaTiO3). (Left) Above 120° C the structure of the BaTiO3 crystal is cubic, and there is no net polarization of charge; (right) below 120° C the structure changes to tetragonal, shifting the relative positions of the ions and causing a concentration of positive and negative charges toward opposite ends of the crystal. — capacitor dielectric and piezoelectric ceramics Figure 1: Ferroelectric properties of barium titanate (BaTiO₃). (Left) Above 120° C the structure of the BaTiO₃ crystal is cubic, and there is no net polarization of charge; (right) below 120° C the structure changes to tetragonal, shifting the relative positions of the ions and causing a concentration of positive and negative charges toward opposite ends of the crystal.

In the context of barium titanate (BaTiO₃) ceramics, chemical substitutions are often used to modify ferroelectric properties. Specifically, substituting strontium (Sr²⁺) for barium (Ba²⁺) in the crystal structure has the effect of lowering the Curie point of the material.1