The dislocation core properties in MgO were modelled as a function of pressure:

from ambient to 100GPa. The calculations were based upon the Peierls–Nabarro

model and first-principles calculations of the generalized stacking fault were used

as input parameters. The results confirmed that ½<110>{110} was the predominant

slip system in MgO under ambient pressures and was easier than ½<110>{100} as

the pressure increased. Nevertheless, the ½<110>{110} slip hardened with

increasing pressure, leading to a decrease in the difference in the Peierls stresses

for ½<110>{110} and ½<110>{100}.

Peierls–Nabarro Modelling of Dislocations in MgO from Ambient Pressure to

100GPa. P.Carrez, D.Ferré, P.Cordier: Modelling and Simulation in Materials

Science and Engineering, 2009, 17[3], 035010