CeO2–La0.5Sr0.5CoO3-δ composites for giant permittivity applications

摘要

CeO2–La0.5Sr0.5CoO3-δ (LSCO) composites with different LSCO loadings were prepared bythe conventional solid-state ceramic route. X-ray diffraction and scanning electron microscopy results show that the composite is a mixture of CeO2 and LSCO. The variation of relative permittivity (measured at 27 °C) with sintering temperature shows that the permittivity is maximum when sintered at 1150 °C for the volume fraction of 0.4 (εr ≈ 105). The permittivity is decreased when sintering temperature increases above 1150 °C. For all volume fractions of LSCO, the relative permittivity of CeO2–LSCO composites is almost independent of temperature in the range -30 to 70 °C. CeO2–LSCO composites can be a suitable substitute for cermets used in electromechanical and embedded passive devices.