can I have (b) please e 2 (a) Consider an ionic crystal in w ich the repuisive potentbal energy Une arises from the action of the Paul exclusion principle, with U given by 8 The attractive potenti...
e 2 (a) Consider an ionic crystal in w ich the repuisive potentbal energy Une arises from the action of the Paul exclusion principle, with U given by 8 The attractive potential energy per ion pair of opposite charges U.1s gven by In these expressions, r is the separation between the ions of opposite sign, n ss a large number and B a constant of the crystal Show that the total potential energy per ion-pair for equilibnum separation ro is ae1 (12) (b) If n for KCl is 5 77, Madelung constant is 1 75 and nearest neighbour separation is 0314 nm, calculate the cohesive energy [1-4 1 eV and E-3 6 eV] (8) (12+8 20
e 2 (a) Consider an ionic crystal in w ich the repuisive potentbal energy Une arises from the action of the Paul exclusion principle, with U given by 8 The attractive potential energy per ion pair of opposite charges U.1s gven by In these expressions, r is the separation between the ions of opposite sign, n ss a large number and B a constant of the crystal Show that the total potential energy per ion-pair for equilibnum separation ro is ae1 (12) (b) If n for KCl is 5 77, Madelung constant is 1 75 and nearest neighbour separation is 0314 nm, calculate the cohesive energy [1-4 1 eV and E-3 6 eV] (8) (12+8 20