%0 Journal Article
%T Thermal Behaviour of Sm0.5R0.5FeO3 (Rˋ=ˋPr, Nd) Probed by High-Resolution X-ray Synchrotron Powder Diffraction
%A Leonid Vasylechko
%A Oleh Buryy
%A Olena Pavlovska
%J Archive of "Nanoscale Research Letters".
%D 2016
%R 10.1186/s11671-016-1328-6
%X Mixed ferrites Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 with orthorhombic perovskite structure isotypic with GdFeO3 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 SmFeO3每PrFeO3 and SmFeO3每NdFeO3 pseudo-binary systems. Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 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 Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 in the temperature range of 298每1173 K are in the limits of (9.0每11.1)ˋ℅ˋ10ˋ6 Kˋ1, which is close to the values reported for the parent RFeO3 compounds. Subtle anomalies in the lattice expansion of Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 detected at 650每750 K reflect magnetoelastic coupling at the magnetic ordering temperature TN
%K Mixed rare earth ferrites
%K Perovskites
%K Crystal structure
%K Thermal expansion
%K Magnetoelastic coupling
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4769243/