High-performance La0.75K0.25MnO3:xAg2O composites based on electron-lattice and electron-magnetic coupling mechanism

Abstract Perovskite manganese oxides possess a large room-temperature coefficient of electrical resistivity (TCR), thereby suitable for fabrication of high-performance uncooled infrared bolometers. Herein, La0.75K0.25MnO3:xAg2O (LKMO:xA, 0.0 ≤ x ≤ 0.4) composites were prepared by combining the sol-gel with solid-state methods. LKMO:0.3A composite revealed TCRmax reaching 18.32% K-1 at 300.4 K, a value higher than those of reported perovskite manganese oxides at room temperature. The electrical transport properties of LKMO:xA composites were also investigated by combining electron-lattice and electron-magnetic coupling and the results were shown promising. In sum, the provided physical mechanism and experimental foundation could optimize high room-temperature TCR of perovskite manganese oxides.