Binary and ternary eutectic composites of the CaO – ZrO2 – MgO system for porous ceramic supports
We recently reported on the use of c-ZrO2-MgO eutectic composites produced by directional solidification as supports for CO2-selective membranes based on molten carbonates. Here, we explore other compositions, particularly within the CaO – ZrO2 – MgO system, with the ultimate goal of improving the m...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/415550 |
| Acceso en línea: | http://hdl.handle.net/10261/415550 |
| Access Level: | acceso abierto |
| Palabra clave: | c-ZrO2 MgO CaZrO3 Directional solidification Eutectics Phase diagram Electrical conductivity |
| Sumario: | We recently reported on the use of c-ZrO2-MgO eutectic composites produced by directional solidification as supports for CO2-selective membranes based on molten carbonates. Here, we explore other compositions, particularly within the CaO – ZrO2 – MgO system, with the ultimate goal of improving the membrane permeation by either increasing the support’s ionic conductivity or reducing its tortuosity. The three eutectic-like composites studied display MgO fibres embedded in single-phase or two-phase matrices. The composite with 8.5CaO/48.5ZrO2/43MgO mol% composition consists of MgO fibres in an oxide-ion conducting c-ZrO2 matrix containing both Ca and Mg. A binary CaZrO3 – MgO eutectic-like composite forms at ∼33CaO/35ZrO2/32MgO mol% with MgO fibres in a Ca-poor, Mg-doped CaZrO3 matrix displaying mixed oxide-ion and hole conductivity. For 22CaO/45ZrO2/33MgO mol% composition, a ternary eutectic forms with MgO fibres at the interfaces of CaZrO3 and c-ZrO2 phases. Acid etching tests were conducted to verify the feasibility of fabricating a porous support. |
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