Citation: Crennel, Susan J.; Cheetham, Anthony K.; Kaduk, James, A.; Jarman, Richard H. (1992). Isomorphous substitution in non-linear optical KTiOPO4: powder diffraction studies of K0.5Rb0.5SnOPO4, K0.5Na0.5Ti0.5Sn0.5OPO4, Na0.5Rb0.5Ti0.5Sn0.5OPO4 and K0.5Rb0.5Ti0.5Sn0.5OPO4. Journal of Materials Chemistry, 2, pp. 785-792.