The known multiferroics (MFs)-ternary oxides with perovskite-type structure PbB0,5′B0,5′′O3 that undergo successive phase transitions (PTs), ferroelectric (FE) or antiferroelectric (AFE) — at the Curie temperature, TC, and ferromagnetic (FM), antiferromagnetic (AFM) or ferrimagnetic at the Néel temperature, TN —and classical FEs and AFEs are considered. The dependences of the TC, TN on the interatomic bond A–O strains in their perovskite structures have been constructed. On constructed dependencies, some ternary MFs are discovered, which have comparatively high temperatures of first FE or AFE and second magnetic PTs but their difference TC–TN values are high comparatively with the binary MFs.