Figure 1. Temperature dependence of permittivity and loss tangent of Ba_0.69Sr_0.24Ca_0.07TiO₃ at 0.1, 1, 10 and 100 kHz.

Measurements were performed during 1 K min⁻¹ heating. Inset shows temperatures of phase transitions in BSCT compounds (series A) as a function of σ².