Synthesis, Crystal Structure and Physical Properties of Sr2FeOsO6

TL;DR

This study reports the synthesis, detailed crystal structure, magnetic behavior, and electronic properties of a new osmium-based double perovskite, Sr2FeOsO6, revealing its phase transitions and semiconducting nature.

Contribution

It introduces a new osmium double perovskite, characterizes its structure and properties, and compares effects of Fe3+ substitution in related compounds.

Findings

Sr2FeOsO6 has a pseudo-cubic structure at room temperature and tetragonal at low temperature.

The compound exhibits two magnetic phase transitions at 140 K and 67 K.

Band structure calculations indicate it is a narrow-gap semiconductor.

Abstract

In the exploration of new osmium based double perovskites, Sr2FeOsO6 is a new insertion in the existing family. The polycrystalline compound has been prepared by solid state synthesis from the respective binary oxides. PXRD analysis shows the structure is pseudo-cubic at room temperature, whereas low-temperature synchrotron data refinements reveal the structure to be tetragonal, space group I4/m. Heat capacity and magnetic measurements of Sr2FeOsO6 indicated the presence of two magnetic phase transitions at T1 = 140 K and T2 = 67 K. Band structure calculations showed the compound as a narrow energy gap semiconductor, which supports the experimental results obtained from the resistivity measurements. The present study documents significant structural and electronic effects of substituting Fe3+ for Cr3+ ion in Sr2CrOsO6.