| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
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| Symposium
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Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XX
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| Presentation Title |
Study on the Phase Diagrams of Bi-Te-RE (Yb, La, Ce, Nd, Sm, Tb, Er) Systems |
| Author(s) |
Ligang Zhang, Mingyue Tan, Cun Mao, Libin Liu |
| On-Site Speaker (Planned) |
Ligang Zhang |
| Abstract Scope |
Bi-Te base alloy is one of the most mature thermoelectric materials at present. In this work，the Bi-Te phase diagram was determined by equilibrium alloy method. Experimental result shows that there is a β-phase with a large composition range at low temperature, while Bi2Te and Bi4Te3 are relatively stable in the solid-liquid region. Isothermal sections of Bi-Te-RE (Yb, La, Ce, Nd, Sm, Tb, Er) ternary systems at 573K and 673K were determined by equilibrium alloy method, combined with microprobe analysis and X-ray diffraction. The maximum solid solubility of Yb in Bi2Te3 and β is about 0.3 at% at 573K and about 0.4 at% at 673K. Ternary compounds with equi-atomic ratio (BiTeRE) were found in the Bi-Te-RE(RE=La,Ce,Nd) systems. The La-Te and Ce-Te binary compounds exhibit a large solid solubility of Bi. The solid solubility of RE elements in Bi-Te matrix increases with the decrease of the atomic radius of rare earth elements. |
| Proceedings Inclusion? |
Planned: |