Infrared emissivity of transition elements doped ZnO
来源期刊：中南大学学报(英文版)2013年第3期
论文作者：YAO Yin-hua(姚银华) CAO Quan-xi(曹全喜)
文章页码：592 - 598
Key words：solid-state reaction; transition element doping; infrared absorption spectrum; infrared emissivity
Abstract: Infrared emissivity was studied in Zn0.99M0.01O (M is Mn, Fe or Ni) and Zn1-xCoxO (x=0.01, 0.02, 0.03 and 0.04) powders synthesized by solid-state reaction at various temperatures. XRD patterns confirm the wurtzite structure of the prepared samples. No peaks of other phases arising from impurities are detected in Mn- and Co-doped ZnO, but the peaks of ZnFe2O4 and NiO are observed in Zn0.99Fe0.01O and Zn0.99Ni0.01O. The SEM observations indicate that with larger grain sizes than those of Zn0.99Fe0.01O and Zn0.99Ni0.01O, Co-doped ZnO exhibits smooth grain surfaces. The infrared absorption spectra show that infrared absorptions related to oxygen in Zn0.99M0.01O are much stronger than those in Co-doped ZnO. Co ions are dissolved into the ZnO lattice with Co2+ state from XPS spectra analysis. The infrared emissivity results imply that the emissivity of Zn0.99Ni0.01O is the highest (0.829) and that of Zn0.99Co0.01O is the lowest (0.784) at 1 200 °C. The emissivity of Zn0.99Co0.01O decreases to the minimum (0.752) at 1 150 °C and then increases with growing calcination temperature. As the Co doping content grows, the emissivity of Co-doped ZnO calcined at 1 200 °C falls to 0.758 in the molar fraction of 3% and then ascends.
YAO Yin-hua(姚银华), CAO Quan-xi(曹全喜)
(School of Technical Physics, Xidian University, Xi’an 710071, China)
Abstract:Infrared emissivity was studied in Zn0.99M0.01O (M is Mn, Fe or Ni) and Zn1-xCoxO (x=0.01, 0.02, 0.03 and 0.04) powders synthesized by solid-state reaction at various temperatures. XRD patterns confirm the wurtzite structure of the prepared samples. No peaks of other phases arising from impurities are detected in Mn- and Co-doped ZnO, but the peaks of ZnFe2O4 and NiO are observed in Zn0.99Fe0.01O and Zn0.99Ni0.01O. The SEM observations indicate that with larger grain sizes than those of Zn0.99Fe0.01O and Zn0.99Ni0.01O, Co-doped ZnO exhibits smooth grain surfaces. The infrared absorption spectra show that infrared absorptions related to oxygen in Zn0.99M0.01O are much stronger than those in Co-doped ZnO. Co ions are dissolved into the ZnO lattice with Co2+ state from XPS spectra analysis. The infrared emissivity results imply that the emissivity of Zn0.99Ni0.01O is the highest (0.829) and that of Zn0.99Co0.01O is the lowest (0.784) at 1 200 °C. The emissivity of Zn0.99Co0.01O decreases to the minimum (0.752) at 1 150 °C and then increases with growing calcination temperature. As the Co doping content grows, the emissivity of Co-doped ZnO calcined at 1 200 °C falls to 0.758 in the molar fraction of 3% and then ascends.
Key words:solid-state reaction; transition element doping; infrared absorption spectrum; infrared emissivity
