Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine.
Nanoscale Res Lett. 2016 Dec;11(1):107. doi: 10.1186/s11671-016-1328-6. Epub 2016 Feb 27.
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-PrFeO3 and SmFeO3-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 298-1173 K are in the limits of (9.0-11.1) × 10(-6) K(-1), which is close to the values reported for the parent RFeO3 compounds. Subtle anomalies in the lattice expansion of Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 detected at 650-750 K reflect magnetoelastic coupling at the magnetic ordering temperature T N.
采用固相反应技术在空气中于 1473 K 合成了具有与 GdFeO3 同构的正交钙钛矿结构的 Sm0.5Pr0.5FeO3 和 Sm0.5Nd0.5FeO3 混合铁氧体。在室温下获得的结构参数证明了 SmFeO3-PrFeO3 和 SmFeO3-NdFeO3 伪二元体系中连续固溶体的形成。Sm0.5Pr0.5FeO3 和 Sm0.5Nd0.5FeO3 表现出强烈各向异性的非线性热膨胀：b 方向的热膨胀比 a 和 c 方向低两倍。Sm0.5Pr0.5FeO3 和 Sm0.5Nd0.5FeO3 在 298-1173 K 温度范围内的平均线性热膨胀系数在（9.0-11.1）×10(-6) K(-1)范围内，接近报道的母体 RFeO3 化合物的值。在 650-750 K 检测到 Sm0.5Pr0.5FeO3 和 Sm0.5Nd0.5FeO3 的晶格膨胀的细微异常反映了在磁有序温度 T N 下的磁弹耦合。
