Structure and electrical properties in polymer bonded La0.7Sr0.3MnO3 composites

Novel bonded perovskite oxide La0.7Sr0.3MnO3(LSMO) was prepared using epoxy resin as the binder and the microstructure, phase characteristic, density, hardness, electrical and magnetic transport properties were studied. The binder has no reaction with LSMO. With the increase of binder concentration (x), the density and hardness of the sample reach the maximum value when x=2.5%. No insulator to metal phase transition is observed in the whole temperature range. The bonded samples show typical low field magnetoresistance characteristics.