A robust thermal-energy-storage property associated with electronic phase transitions for quadruple perovskite oxides

Abstract

The quadruple perovskite oxides RCu₃Fe₄O₁₂ (R: rare-earth metals) exhibit large latent-heat capacities (25 J g⁻¹ at maximum) with variable transition temperatures between 254 and 368 K, whereas their transition entropies are almost completely retained. This finding proposes an effective way to design robust thermal-energy-storage materials with various operating temperatures.