Phase diagram features and solidification behaviour of CoCu2O3 at elevated oxygen pressure
| Autor: | Günter Behr, Bernd Büchner, Ludwig Schultz, Wolfgang Löser, N. Wizent, Wolfgang Gruner, L. Schramm, A. Voß |
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| Rok vydání: | 2009 |
| Předmět: |
Phase transition
Chemistry Metallurgy Thermodynamics Partial pressure Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Congruent melting Phase (matter) Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry CALPHAD Directional solidification Bar (unit) Phase diagram |
| Zdroj: | Journal of Solid State Chemistry. 182:2036-2040 |
| ISSN: | 0022-4596 |
| Popis: | A unique behaviour of the phase CoCu{sub 2}O{sub 3} was found both from CALPHAD calculations and directional solidification experiments. For elevated oxygen partial pressure the solidification mode changed from double-peritectic to a congruent melting behaviour with respect to the metals (Cu, Co) and to the oxygen content. This transition predicted by the phase diagram calculations was confirmed by microstructure and phase analyses of samples solidified at oxygen pressures up to 60 bar. A DTA analysis has verified basic features of the phase diagram at normal pressures. - Graphical abstract: A unique behaviour of the phase CoCu{sub 2}O{sub 3} was found both from CALPHAD calculations and directional solidification experiments. For elevated oxygen partial pressure the solidification mode changed from double-peritectic (1 bar O{sub 2}; left figure) to a congruent melting behaviour with respect to the metals (Cu, Co) and to the oxygen content (80 bar O{sub 2}; right figure). |
| Databáze: | OpenAIRE |
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