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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1239| Synthesis and microstructural characterization of zirconia scandia system. | |
| DANIEL RICARDO ORTIZ PALACIOS HILDA ESPERANZA ESPARZA PONCE GUILLERMO TORRES MOYE | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Synthesisi | |
| the last years the production of clean energy has been very important replacing or improving the materials to reduce the amount of material, weight, operating temperature, cost, etc. Solid electrolytes are used in the new technologies as Solid Oxide Fuel Cells (SOFCs) where is important to reduce the operation temperature. These cells operate at temperatures between 700 and 850 °C and the priority of lowering the operating temperature of SOFCs have attracted great interest worldwide. One of the greatest barriers to reduce the temperature of operation is the ohmic loss of the electrolyte. Maximize the ionic conductivity of the electrolyte is of significant importance especially in the absence of a variety of materials for electrolytes. Zirconia stabilized with different oxides as used as electrolyte solid in the SOFCs, since some years the most commonly used electrolyte is yttrium stabilized zirconia and recently was introduced the use of stabilized zirconia scandia. It is well known that zirconia has three polymorphic phases: high-temperature cubic phase, tetragonal (intermediate temperature) and low-temperature monoclinic phase. And that the stabilization of phases may be carried out by adding a doping agent, which may be calcium oxide, magnesium, yttrium, cerium, scandium and rare earths; the phase depends on proportions of these oxides and the thermal procedure. The phase diagrams of the calcium, magnesium and yttrium oxides is known that are well defined, but in the case of zirconia stabilized with scandia, the system only have a small region that include the cubic and tetragonal phases, it does difficult getting these phases. A lot of work has been done through different methods: Gel combustion synthesis [1], co precipitation [2] and ceramic processing in which normally is obtained a rombohedral phase rather than a cubic or tetragonal phases. | |
| 2012 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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| 1372_1361510-m.pdf | 1.14 MB | Adobe PDF | Visualizar/Abrir |