Interatomic force constant of A(II)B(IV)C(2)(V) and A(I)B(III)C(2)(VI) semiconductors

The interatomic force constant (a) of the A-C and B-C bonds in A(II)B(IV)C( 2)(V) and A(I)B(III)C(2)(VI) semiconductors with chalcopyrite structure has been calculated using the plasma oscillation theory of solids. An exponent ial relation between force constant and plasmon energy alpha = K-1 exp [-K- 2((h) over bar omega(p))(-2/3)] has been obtained. The effect of delocaliza tion of noble metal d-electrons has been taken into account while calculati ng the force constant of the A-C bond in A(I)B(III)C(2)(VI) semiconductors. On the basis of the best fit data, another simple equation alpha = K-3((h) over bar omega(p))(K4) has been proposed for the calculation of the force constant from their plasmon energy. The calculated values of force constant from the above two equations have been compared with the values reported b y different workers. An excellent agreement has been obtained between them.