Informace o publikaci
Experimental investigation and thermodynamic description of selenium‐based systems
| Autoři | |
|---|---|
| Rok publikování | 2024 |
| Druh | Konferenční abstrakty |
| Fakulta / Pracoviště MU | |
| Citace | |
| Popis | A new thermodynamic description of the binary Co-Se system was introduced using the CALPHAD approach to predict and describe the phase equilibria, including the development of new models for phases CoSe1, Co9Se81 and CoSe21. The models and thermodynamic description were verified by comparing the predicted phase diagram with the experimental data obtained in this study and calculated ab initio data.Furthermore, the ternary Co-Se-Sn system has been investigated experimentally to determine the phase equilibria and the microstructure of the alloys formed at temperatures 400, 600 and 1000 °C (see Figure 1 for an isothermal section at 600 °C). Samples of various compositions were prepared using a preliminary ternary phase diagram based on the thermodynamic data of binary systems1,2,3. Samples were melted, long-term annealed, quenched and characterized using scanning electron microscopy, X-ray diffraction and thermal analysis. The combined experimental results confirmed the presence of several binary phases in this system, including Co3Sn22, CoSn22, CoSe1, Co9Se81, CoSe21, SeSn3, SeSn23 and one skutterudite-related ternary phase Co2(SnSe)34. The experimental and modelling results obtained in this study provide new insights into the behaviour of the Co Se and Co-Se-Sn systems. They can be applied in the design and optimization of Co-based alloys for various industrial applications, such as magnetic storage media, high-temperature materials, and thermoelectric devices. |