Abstract
This work advances the anharmonic correlated Einstein model to investigate how pressure and temperature affect the Debye–Waller factor and thermodynamic parameters of an intermetallic alloy. By usi...
Highlights
Extended X-ray absorption fine structure (EXAFS) spectroscopy has developed into a powerful probe of atomic structure and the high-temperature thermodynamics of substances due to anharmonicity (Iwasawa et al, 2017; Rehr, 2000)
We investigate thermodynamic parameters such as (i) the effective spring constant, (ii) the thermal expansion coefficient, (iii) the anharmonic factor, and (iv) the Einstein frequency and temperature and how they depend on temperature at ambient pressure for CuAg72
The cumulants σðnÞðnÞ depend on the absolute temperature T and are influenced by pressure up to 14 GPa
Summary
Extended X-ray absorption fine structure (EXAFS) spectroscopy has developed into a powerful probe of atomic structure and the high-temperature thermodynamics of substances due to anharmonicity (Iwasawa et al, 2017; Rehr, 2000). Several groups have applied ACEM theory to EXAFS to study how the thermodynamic properties depend on temperature with the effect of the material doping ratio (DR) (Duc et al, 2017; Hung et al, 2015; Kraut & Stern, 2000; Nafi et al, 2013). CuAg72 has a ratio of 72% Ag and 28% Cu (±1%) and is known as CuSil or UNS P0772 (note: CuSil should not be confused with Cusil-ABA, which has the composition 63.0% Ag, 35.25% Cu, and 1.75% Ti) It is an eutectic alloy and is used primarily for vacuum brazing (Nafi et al, 2013)
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