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- Title
Thermodynamic Modeling of the Cu-Sb-Se System.
- Authors
Liu, Runlin; Wang, Jiong; Cui, Dongyu
- Abstract
The doping with Cu in the Sb-Se material system can effectively reduce power consumption and improve data retention ability of the PCRAM (Phase-Change Random-Access Memory) material. However, no thermodynamic study of the Cu-Sb-Se system has been reported. Therefore, in this work the Cu-Sb-Se system was modeled using the CALPHAD (CALculation of PHAse Diagrams) method. The excess Gibbs energies of solution phases, including liquid and FCC were expressed by the Redlich-Kister polynomial. Two-sublattice model (Cu,Se)2Se was used to describe the solid solution of binary intermetallic compounds, i.e. α-Cu2Se and β-Cu2Se in Cu-Sb-Se ternary system. The compounds, e.g. η(Cu2Sb), β(Cu3Sb), Sb2Se3, α-CuSe, β-CuSe, Pe(Cu3SbSe4) and C(CuSb3Se5) were described as stoichiometric compounds. The temperature of the eutectic reaction γ(Cu17Sb3) = (Cu) + δ(Cu4Sb) in the Cu-Sb system and the temperature of the invariant reaction L1 = L2 + (Sb) in the Sb-Se system were adjusted. A set of self-consistent thermodynamic parameters for the Cu-Sb-Se system was obtained, and the 623, 673, 723, 773, 873 and 973 K isothermal sections, and the liquidus projection and invariant reactions for this ternary system have been calculated.
- Subjects
FACE centered cubic structure; PHASE change memory; EUTECTIC reactions; TERNARY system; PHASE diagrams; INTERMETALLIC compounds; EUTECTICS
- Publication
Journal of Phase Equilibria & Diffusion, 2023, Vol 44, Issue 6, p687
- ISSN
1547-7037
- Publication type
Article
- DOI
10.1007/s11669-023-01074-8