Potential energy in the diamond structure. (a) Show that for the diamond structure the Fourier component UG of the crystal potential seen by an electron is cqual to zero for 𝐆=2 𝐀, where 𝐀 is a basis vector in the reciprocal lattice referred to the conventional cubic cell. (b) Show that in the usual first-order approximation to the solutions of the wave equation in a periodic lattice the energy gap vanishes at the zone boundary plane normal to the end of the vector 𝐀. | Numerade
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SOLVED:The heats of combustion for graphite and diamond are as follows: Cgapere (s)+O2( g) →CO2( g) ΔH=-394 kJ Ccanoed (s)+O2(g) →CO2( g) ΔH=-396 kJ Diamond spontaneously changes to graphite. What is the change in enthalpy accompanying the conversion of two moles of diamond to graphite? A. -790 kJ B. -4 kJ C. 2 kJ D. 4 kJ
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