Infrared emissivity and microwave absorption property of Sm _0.5Sr_0.5CoO₃ perovskites decorated with carbon nanotubes

Pure perovskite-type Sm_0.5Sr_0.5CoO₃ (SSC, in short) oxide and SSC/carbon nanotubes composites were sintered under nitrogen atmosphere to study the in-service performance. The phase stability, optical reflection, infrared emissivity and microwave absorption property were systematically investigated. The pure Sm_0.5Sr_0.5CoO ₃ sample maintained perovskite structure and low infrared emissivity in nitrogen atmosphere below 1000 °C. For the composite specimens, the emergence of A₂BO₄, Sm₂O₃, CoO and cobalt metal phases was inevitable due to the flowing nitrogen atmosphere, the excess temperature and the carbon nanotubes content, which in consequence played a key role in increasing the infrared emissivity. However, the composites displayed remarkable enhanced microwave absorption property compared with the pure perovskites.