. Magnesium oxide has the rock salt structure, its density is 3580 kg/m3, and s11=3.99_10_12 Pa_1. The surface energy of the (100) plane is 1.2 J/m2. Estimate the bond length of MgO. Estimate the...

. Magnesium oxide has the rock salt structure, its density is 3580 kg/m3, and s11=3.99_10_12 Pa_1. The surface energy of the (100) plane is 1.2 J/m2. Estimate the bond length of MgO. Estimate the theoretical strength of MgO for cleavage on the (100) plane.

. Silicon has the diamond structure, atomic weight 28.09, and a density of 2329 kg/m3. Young’s modulus in the /111S direction is 188 GPa and the surface energy of the (111) plane is 1.2 J/m2. Estimate the spacing of the atomic planes in the /111S direction, a0. Estimate the theoretical strength of silicon on the (111) plane.