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Details
Phase diagram of CeO2-CoO for nano-sized powders
| Author | Ivas, T.; Grundy, A. N.; Povoden-Karadeniz, E.; Gauckler, L. J. | |
| Year | 2012 | |
| Type | Journal Article | |
| Journal | Calphad-Computer Coupling of Phase Diagrams and Thermochemistry | |
| Volume | 36 | |
| Pages | 57-64 | |
| Date | Mar | |
| Alternate Journal | Calphad Calphad |
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| ISSN | 0364-5916 | |
| Accession Numer | ISI:000300863000009 | |
| Keywords | ceo2-coo; nano-phase diagrams; nanoparticles; size depending melting; quasiternary oxide systems; cerium-gadolinium-oxide; surface-tension; thermodynamic evaluation; solid-solutions; melting-point; fuel-cells; nanoparticles; dependence; energy | |
| Abstract | The CALPHAD (Calculation of Phase Diagrams) framework to calculate the thermodynamic properties of multicomponent systems is extended to account for the change in thermodynamic properties by the size effect in small particle systems. We have applied this framework to the CeO2-CoO binary in order to elucidate the "liquid phase sintering like" fast densification at unusually low temperatures of cobalt oxide doped ceria. The phase diagram for 5 nm particles shows a significant drop of the eutectic from 1645 degrees C to 1327 degrees C. The size-dependent thermodynamic stability of intergranular films is examined using CALPHAD approach and melting temperature of 1180 degrees C is found for 1 mol% CoO doped CeO2 corresponding to an intergranular film thickness between 1 and 4 nm. This result comes close to the unusual low sintering temperatures of 1100 degrees C, with a "liquid-sintering"-like characteristic that was previously experimentally observed for CeO2 with small amounts of transition metal oxides such as CoO. (C) 2011 Elsevier Ltd. All rights reserved. | |
| Notes | 900CA Times Cited:1 Cited References Count:61 |
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| URL |
Access publication [Website] |
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| Link to PDF | ||
| Author Address | Ivas, T ETH, Dept Mat, Wolfgang Pauli Str 10, CH-8093 Zurich, Switzerland ETH, Dept Mat, CH-8093 Zurich, Switzerland Concast AG, CH-8002 Zurich, Switzerland TU Wien, Inst Werkstoffwissensch & Werkstofftechnol, Christian Doppler Lab Early Stages Precipitat, A-1040 Vienna, Austria |
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| Record Number | 34 | |
| Group | nonmet |
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