Structural study and evaluation of thermoelectric properties of single-phase isocubanite (CuFe2S3) synthesized via an ultra-fast efficient microwave radiation technique

TL;DR

This study reports the first synthesis of single-phase CuFe2S3 using a rapid microwave method, revealing its thermoelectric properties and detailed structural characteristics, with potential as a cost-effective thermoelectric material.

Contribution

First successful synthesis and detailed analysis of single-phase CuFe2S3 via an ultra-fast microwave technique, highlighting its thermoelectric performance and structural disorder.

Findings

Maximum zT of ~0.14 at 673 K

Cu-Fe cations occupy 4d sites in a disordered manner

Structural insights from X-ray and first principles calculations

Abstract

The current state-of-the-art thermoelectric materials are generally composed of expensive, scarce, and toxic elements. In this respect, copper-based sulfide compounds have emerged as viable alternatives. Herein, we report for the first time the successful synthesis of single-phase cubic isocubanite CuFe2S3 using mechanical-alloying combined with microwave-assisted synthesis. The isocubanite phase synthesized via this ultra-fast out-of-equilibrium process exhibits a maximum thermoelectric figure of merit, zTmax ~ 0.14 at 673 K. Besides the thermoelectric properties, insights about the structure of isocubanite, based on the refinement of X-ray diffraction data and first principles calculations, are also investigated in detail. It confirms that the Cu-Fe cations in synthetic isocubanite overwhelmingly occupy the 4d sites of the cubic structure in an inherently disordered fashion.