Si diamond SNAP_ZuoChenLi_2019quadratic_Si__MO_721469752060_000 5.464352798461917 Warning: Maximum number of iterations has been exceeded. C11 = 155.063493 +/- 0.007336 GPa C12 = 57.484003 +/- 0.005187 GPa C44 = 69.142618 +/- 0.001834 GPa B = 90.010499 +/- 0.004235 GPa