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Mixed ferrites Sm 0.5 Pr 0.5 FeO 3  and Sm 0.5 Nd 0.5 FeO 3  with orthorhombic perovskite structure isotypic with GdFeO 3  were synthesized by solid-state reaction technique in air at 1473 K. Structural parameters obtained at room temperature prove a formation of continuous solid solutions in the SmFeO 3 –PrFeO 3  and SmFeO 3 –NdFeO 3  pseudo-binary systems. Sm 0.5 Pr 0.5 FeO 3  and Sm 0.5 Nd 0.5 FeO 3  show strongly anisotropic nonlinear thermal expansion: thermal expansion in the  b  direction is twice lower than in the  a  and  c  directions. The average linear thermal expansion coefficients of Sm 0.5 Pr 0.5 FeO 3  and Sm 0.5 Nd 0.5 FeO 3  in the temperature range of 298–1173 K are in the limits of (9.0–11.1) × 10 −6  K −1 , which is close to the values reported for the parent  R FeO 3  compounds. Subtle anomalies in the lattice expansion of Sm 0.5 Pr 0.5 FeO 3  and Sm 0.5 Nd 0.5 FeO 3  detected at 650–750 K reflect magnetoelastic coupling at the magnetic ordering temperature  T  N .

Thermal Behaviour of Sm0.5 R 0.5FeO3 (R = Pr, Nd) Probed by High-Resolution X-ray Synchrotron Powder Diffraction