| Summary: | The phase content and sequence, the crystal structure, and the magnetic properties of perovskite solid solutions of the (1−<i>y</i>)BiFeO<sub>3</sub>–<i>y</i>BiZn<sub>0.5</sub>Ti<sub>0.5</sub>O<sub>3</sub> series (0.05 ≤ <i>y</i> ≤ 0.90) synthesized under high pressure have been studied. Two perovskite phases, namely the rhombohedral <i>R</i>3<i>c</i> and the tetragonal <i>P</i>4<i>mm,</i> which correspond to the structural types of the end members, BiFeO<sub>3</sub> and BiZn<sub>0.5</sub>Ti<sub>0.5</sub>O<sub>3</sub>, respectively, were revealed in the as-synthesized samples. The rhombohedral and the tetragonal phases were found to coexist in the compositional range of 0.30 ≤ <i>y</i> ≤ 0.90. Magnetic properties of the BiFe<sub>1−<i>y</i></sub>[Zn<sub>0.5</sub>Ti<sub>0.5</sub>]<i><sub>y</sub></i>O<sub>3</sub> ceramics with <i>y</i> < 0.30 were measured as a function of temperature. The obtained compositional variations of the normalized unit-cell volume and the Néel temperature of the BiFe<sub>1−<i>y</i></sub>[Zn<sub>0.5</sub>Ti<sub>0.5</sub>]<i><sub>y</sub></i>O<sub>3</sub> perovskites in the range of their rhombohedral phase were compared with the respective dependences for the BiFe<sub>1−<i>y</i></sub><i>B</i><sup>3+</sup><i><sub>y</sub></i>O<sub>3</sub> perovskites (where <i>B</i><sup>3+</sup> = Ga, Co, Mn, Cr, and Sc). The role of the high-pressure synthesis in the formation of the antiferromagnetic states different from the modulated cycloidal one characteristic of the parent BiFeO<sub>3</sub> is discussed.
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