Infrared emissivities of Mn,Co co-doped ZnO powders

摘要

Infrared emissivities of Zn0.99-xMn0.01CoxO（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 Zn0.98Mn0.01Co0.01O 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℃.