Infrared emissivity and microwave absorption property of Sm0.5Sr0.5CoO3 perovskites decorated with carbon nanotubes

Pure perovskite-type Sm0.5Sr0.5CoO3 (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 Sm0.5Sr0.5CoO3 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.

► High-temperature thermostability of Sm0.5Sr0.5CoO3 under nitrogen is proposed. ► The introduction of carbon nanotubes can improve microwave absorbing property. ► SSC/CNTs will be available for infrared/radar camouflage at high temperatures.