8.4 Energy Density, Cohesive Energy, and Free Energy
173
Table 8.5
Interface mean bond energy
E IS
, mean lattice constant
d IS
, cohesive energy E
IC , energy density E
ID , and the free energy
γ I . E
b and d
b are the
bond energy and bond length of the bulk constituent, respectively. E
I (A-A or B-B) is the bond energy of A or B in the interface; E
I (A-B) is the A-B exchange
interaction energy [33, 34, 48]
Alloy
Atom
E
b (eV)
E
I (A-A) (eV)
E
I (A-B) (eV)
E IS
(eV)
d
b (nm)
d IS
(nm)
E
IC (eV)
E
ID (10 10
J/m 3
)
γ I (J/m 2
)
Be/W
Be
0.28
0.24
0.38
0.52
0.229
0.273
6.24
9.85
26.85
W
0.74
0.60
0.316
Cu/Pd
Cu
0.29
0.56
0.50
0.63
0.360
0.375
7.56
4.59
17.20
Pd
0.32
0.45
0.389
Ag/Pd
Pd
0.32
0.22
0.20
0.26
0.389
0.399
2.76
1.57
6.28
Ag
0.25
0.19
0.409