Influence of microwave-assisted hydrothermal treatment on the properties of nickel oxide–zirconia based composites
| Autor: | Francisco N. Tabuti, L.B. Pinheiro, Antonio Eduardo Martinelli, Fabio C. Fonseca |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Thermogravimetric analysis
Materials science Coprecipitation Sintering Impedance spectroscopy 02 engineering and technology 010402 general chemistry 01 natural sciences Microwave-assisted hydrothermal Differential thermal analysis Materials Chemistry Ceramic Composite material Yttria-stabilized zirconia Process Chemistry and Technology Nickel oxide Ceramic composites 021001 nanoscience & nanotechnology Microstructure 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials visual_art Ceramics and Composites visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Repositório Institucional da UFRN Universidade Federal do Rio Grande do Norte (UFRN) instacron:UFRN |
| Popis: | The influence of a microwave-assisted hydrothermal treatment (MWH) on the properties of NiO–ZrO 2 :8 mol%Y 2 O 3 –CeO 2 composite was investigated. The composites were prepared by coprecipitation of nickel and cerium salts in a suspension of ZrO 2 :8 mol%Y 2 O 3 (YSZ). Simultaneous thermogravimetric and differential thermal analysis revealed that the MWH promotes the crystallization of Ni(OH) 2 , as confirmed by X-ray diffraction. The sintering behavior of ceramic compacts was influenced by the MWH treatment, which contributed to slightly higher final apparent densities. Impedance spectroscopy measurements revealed that the electrical properties of sintered composites exhibit characteristics of mixed-ionic–electronic conductors, a feature that was suppressed in the samples that underwent MHW treatment. Such an effect evidences the influence of hydrothermal treatment on the final microstructure of the composite. |
| Databáze: | OpenAIRE |
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