The influence of experimental conditions on the morphology and phase composition of Nb-doped ZrO2 films prepared by spark anodization |
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| Affiliation: | 1. School of Chemical Engineering, Northwest University, Xi''an 710069, China;2. Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Xi''an 710069, China;3. Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Xi''an 710069, China;4. International Scientific and Technological Cooperation Base for Clean Utilization of Hydrocarbon Resources, Xi''an 710069, China;5. China Huaneng Group Clean Energy Technology Research Institute, Beijing 100098, China |
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| Abstract: | This paper reports the morphological and microstructural characterization of Nb-doped ZrO2 films obtained by anodic doping in conditions of spark electrolytic breakdown. The oxide films were prepared by galvanostatic anodization of metallic Zr in oxalic acid solution containing ammonium oxaloniobate, NH4H2[NbO(C2O4)3]⋅3H2O using Nb(V) ions as the precursor dopant. The characterization was performed by SEM and XRD. A factorial design was used to optimize the experiments and study the influence of experimental variables on morphology and phase composition. The results demonstrated that the dopant concentration is the most important factor that affected the analyzed responses. A significant influence of this variable was observed on the pore average diameter and on the percentage of the stabilized tetragonal phase. The temperature also affected the phase composition, however no effect was observed on the morphological response. |
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| Keywords: | A. Zirconium oxide coatings B. SEM B. XRD |
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