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Preparation and infrared emissivities of alkali metal doped ZnO powders

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Abstract

Alkali metal (Li, Na, K) doped ZnO powders were synthesized by solid-state reaction at different calcination temperatures and holding time. Effects of holding time and K sources on the infrared emissivity of ZnO were investigated. The structure and surface morphologies of samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The UV-Vis absorption and infrared emissivities were investigated by a UV-Vis spectrophotometer and an infrared emissometer, respectively. XRD patterns confirm the wurtzite structure of the as prepared samples with single phase. Smooth grain surfaces are detected in all doped ZnO samples, while ZnO:Li and ZnO:Na present the aggregation of grains. The redshifts in the optical band-gap are observed in K-, Na-, and Li-doped ZnO with the values 3.150, 3.144, and 3.142 eV. Due to better crystalline quality, ZnO:K shows a lower emissivity than others. The emissivity of K-doped ZnO decreases to the minimum value (0.804), at 1200 °C and holding 2 h. Compared with KNO3 as K source, K2CO3 doped ZnO has lower emissivities.

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Authors and Affiliations

  1. School of Advanced Materials and Nanotechnology, Xidian University, Xi’an, 710071, China

    Hui-hui Li  (李会会), Yun-xia Huang  (黄云霞), Zhi-min Li  (李智敏), Yin-hua Yao  (姚银华) & Shu-yuan Zhang  (张淑媛)

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  1. Hui-hui Li  (李会会)
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  2. Yun-xia Huang  (黄云霞)
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  3. Zhi-min Li  (李智敏)
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  4. Yin-hua Yao  (姚银华)
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  5. Shu-yuan Zhang  (张淑媛)
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Correspondence to Yun-xia Huang  (黄云霞).

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Foundation item: Project(JB141405) supported by the Fundamental Research Funds for the Central Universities of China

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Li, Hh., Huang, Yx., Li, Zm. et al. Preparation and infrared emissivities of alkali metal doped ZnO powders. J. Cent. South Univ. 21, 3449–3455 (2014). https://doi.org/10.1007/s11771-014-2321-9

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  • DOI: https://doi.org/10.1007/s11771-014-2321-9

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