A case study of ceramic processing: Microstructural development and electrical properties of Ce0.8Gd0.2O1.9
| Autor: | D. P. F. de Souza, Celso Antonio Goulart, Ruth Herta Goldsmith Aliaga Kiminami, Lúcia Adriana Villas-Boas |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp), Universidade Federal de São Carlos (UFSCar) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Sintering Microwave sintering 02 engineering and technology Conductivity 01 natural sciences Colloid 0103 physical sciences Materials Chemistry Ceramic Composite material Gadolinium-doped ceria Nanostructured ceramics Two-step sintering 010302 applied physics Ceramic processing Process Chemistry and Technology 021001 nanoscience & nanotechnology Microstructure Surfaces Coatings and Films Electronic Optical and Magnetic Materials visual_art Particle-size distribution Ceramics and Composites visual_art.visual_art_medium Grain boundary 0210 nano-technology Microwave |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2020-12-12T01:14:02Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-06-01 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The effects of powder characteristics and conformation methods on green microstructure have been investigated, and microstructural evolution was analyzed based on the green density and the different sintering techniques. Colloidal processing of nanopowders with narrow particle size distribution (15 ± 5 nm) can be more problematic than dry processing and can lead to more heterogeneous microstructures. Two-step sintering can be used to obtain dense nanostructured samples with more flexibility than microwave sintering and still at lower temperatures than conventional sintering. The sinterability of Ce0.8Gd0.2O1.9 is significantly improved by Zn addition, which can reduce sintering temperature to values as low as 800, 1150 and 1200 °C for two-step, microwave and conventional sintering, respectively, in order to achieve relative densities above 90%. Microscopic grain boundary conductivity is shown to be improved in nanostructured samples, despite the higher grain boundary density. São Paulo State University (UNESP) School of Sciences and Engineering Graduate Program in Materials Science and Engineering Department of Materials Engineering Federal University of São Carlos São Paulo State University (UNESP) School of Sciences and Engineering |
| Databáze: | OpenAIRE |
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