| Grant number: | 12/03319-5 |
| Support type: | Scholarships in Brazil - Doctorate |
| Effective date (Start): | June 01, 2012 |
| Effective date (End): | May 31, 2016 |
| Field of knowledge: | Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials |
| Principal researcher: | Eliana Navarro dos Santos Muccillo |
| Grantee: | Robson Lopes Grosso |
| Home Institution: | Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil |
| Associated scholarship(s): | 14/24022-6 - Thermodynamic study of the phase stability of zirconia-scandia nanoparticles, BE.EP.DR |
Abstract In this work, the effects of oxide additives (dysprosium and niobium oxides) on scandia-stabilized zirconia will be investigated aiming to stabilize the cubic phase at room temperature and to suppress the characteristic cubic-rhombohedric phase transformation. The effect of the particle size on the phase transition will be also subject of this study, by the synthesis and structural characterization of nanostructured powders and comparison with standard materials. The main characterization techniques are: geometric and hydrostatic density measurements, thermoanalytical techniques for characterization of the thermal decomposition of precursor materials and linear shrinkage measurements. The phase assemblage will be determined by X-ray diffraction of materials (particulate and sintered). The morphology of sintered compositions will be observed by scanning electron microscopy coupled to energy dispersive X-ray spectroscopy for determination of the average grain size along with a semiquantitative evaluation of the chemical composition. Electrical conductivity measurements will be carried out by impedance spectroscopy. The results obtained will be used for structural and electrical characterization of ternary systems. The main purpose of this work is to suppress the detrimental cubic-rhombohedric phase transformation and to verify the electrical conductivity envisaging the application of the solid electrolyte in solid oxide fuel cells operating at intermediate temperature. As an additional feature, we intend to submit a proposal for a BEPE- type scholarship for complimentary study at LEPMI, Grenoble, France. (AU) | |
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