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Table 2 Values elastic constants (× 10−11 N/m) for Si, Ge by present theory and experimental values [11]

From: High-pressure study of thermodynamic parameters of diamond-type structured crystals using interatomic Morse potentials

Crystal

c11

c12

c13

c33

Si (present)

1.85

0.64

0.55

2.13

Si (expt.)

1.77

0.41

0.61

1.54

Ge (present)

1.46

0.57

0.46

1.63

Ge (expt.)

1.35

0.52

0.52

0.57