期刊
MATERIALS
卷 14, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/ma14123437
关键词
NiO-GDC nanocomposites; combustion synthesis; microstructure; rietveld refinement; properties
类别
资金
- FONDEF [ID14I20452]
- FONDECYT, Government of Chile [1181703]
- University of Concepcion, Chile
In this study, Nickel oxide-gadolinium doped ceria (NiO-GDC) nanocomposite powders were synthesized via fast solution combustion technique using different mixing methods. The calcined nanocomposites showed variations in microhardness based on the synthesis approach, with a higher microhardness obtained for samples synthesized through the CM method. However, despite the lengthy ball-milling process compared to hand mortar, no significant improvement in the electrical properties was observed.
The synthesis of the nickel oxide-gadolinium doped ceria (NiO-GDC with 65:35 wt. %) nanocomposite powders with a stoichiometry of Gd0.1Ce0.9O1.95 was performed via fast solution combustion technique; using three different mixing methods: (i) CM (metal cations in an aqueous solution), (ii) HM (hand mortar), and (iii) BM (ball milling). The nanocomposite powders were calcined at 700 degrees C for 2 h and characterized by Transmission Electron Microscopy (TEM), X-ray fluorescence (XRF), and X-ray Diffraction XRD. The TEM and XRD analyses evidenced the well-dispersed NiO and GDC crystallites with the absence of secondary phases, respectively. Later, the calcined powders (NiO-GDC nanocomposites) were compacted and sintered at 1500 degrees C for 2 h. The microhardness of the sintered nanocomposites varies in accordance with the synthesis approach: a higher microhardness of 6.04 GPa was obtained for nanocomposites synthesized through CM, while 5.94 and 5.41 GPa were obtained for ball-milling and hand-mortar approach, respectively. Furthermore, it was observed that regardless of the long time-consuming ball-milling process with respect to the hand mortar, there was no significant improvement in the electrical properties.
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