KFe2S3

KFe2S3 is an iron sulfide compound belonging to the metal sulfide family, combining potassium, iron, and sulfur in a ternary system. While not a conventional structural alloy, this material is primarily of interest in materials research for energy storage applications, particularly as a cathode material or electrolyte component in next-generation battery systems. Its appeal stems from the abundance of iron and sulfur, making it a cost-effective alternative to conventional lithium-ion battery materials, though it remains largely in the research and development phase rather than large-scale industrial production.