Infrared emissivities of Mn,Co co-doped ZnO powders

<正>Infrared emissivities of Zn_0.99-xMn_0.01Co_xO（x=0.00,0.01,0.03,0.05） powders synthesized at different calcination temperatures by solid-state reaction are investigated.Their phases,morphologies,UV absorption spectra,and infrared emissivities are studied by XRD,SEM,UV spectrophotometer,and an IR-2 dual-band infrared emissometer in a range of 8μm-14μm.Doped ZnO still has a wurtzite structure,and no peaks of other phases originating from impurities are detected.The optical band-gap decreases as the Co content and calcination temperature ascend,and of which the smallest optical band gap is 2.19 eV.The lowest infrared emissivity,0.754,is observed in Zn_0.98Mn_0.01Co_0.01O with the increase in Co concentration.The infrared emissivity experiences fluctuations as the calcination temperature increases,and its minimum value is 0.762 at 1100℃.