Synthesis, Structural and Optical Properties of (ALa)(FeMn)O6 (A = Ba and Sr) Double Perovskites

TL;DR

This study synthesizes and characterizes two double perovskites, revealing their crystal structures and confirming their insulating nature with a wide band gap of about 6 eV.

Contribution

It provides detailed structural and optical characterization of (ALa)(FeMn)O6 double perovskites with different A-site cations, using synthesis and X-ray diffraction analysis.

Findings

(BaLa)(FeMn)O6 has cubic structure (Pm-3m).

(SrLa)(FeMn)O6 has rhombohedral structure (R-3c).

Both are insulators with ~6 eV band gap.

Abstract

Here, we report structural and optical properties of (ALa)(FeMn)O6 (A = Ba and Sr) double perovskite synthesized via auto-combustion followed by a calcination process. Rietveld refinement of the structure using x-ray diffraction data reveals that (BaLa)(FeMn)O6 crystallizes into cubic crystal structure with space group Pm-3m while (SrLa)(FeMn)O6 crystallizes into rhombohedral crystal structure having space group R-3c. The absorption spectrum measurement using UV-Vis spectroscopy reveals that these samples are perfect insulator having an energy band gap between conduction and valence band of the order of 6 eV.