Some dielectric properties of Ba1-xSrxTiO3 single crystals grown from a KF flux

The temperature dependences of permittivity and of hysteresis loops in the range of 4.2 K to 600 K were measured on mixed Ba_1-xSr_xTiO₃ single crystals, grown in the whole concentration region 0≦x≦1 from a KF flux. It is shown that a solid solution with dielectric properties compatible with existing theories is formed by isovalent substitution of Ba by Sr only for x=0?0.4 and 0.8?1. A comparison between our results on single crystals and previous measurements on mixed ceramic materials is carried out.