Negative thermal expansion property of Sm1-xCuxMnO3-δ

The negative thermal expansion (NTE) property of a Sm1-xCuxMnO3-delta (x = 0.05, 0.1, 0.15, 0.2) material was studied in detail. The Sm1-xCuxMnO3-delta was synthesized by a solid phase method. The SEM, EDS, XRD, and XPS results indicate that Sm1-xCuxMnO3-delta crystallizes in an orthorhombic symmetry structure with polyhedron grains. Sm0.85Cu0.15MnO3-delta exhibits NTE property from 473 K to 873 K with the liner coefficient of thermal expansion (CTE) -5.93 x 10(-6)/K. We analyzed that the additive of Cu2+ enhance the extent of distortion in perovskite structure, which play an important role in the thermal expansion property. It is indicated that the lattice distortion, Pore size and oxygen vacancy provide an essential condition for NTE in this material. (C) 2021 The Author(s). Published by Elsevier B.V.

Automated summary

The study on Sm1-xCuxMnO3-delta material revealed that the addition of Cu2+ enhances the distortion in perovskite structure, which plays a crucial role in its negative thermal expansion property.