Citation: Ibers, J.A.; Huang, F.Q. (2001). Syntheses, structures and physical properties of the new quaternaryrare-earth chalcogenides Rb Nd2 Cu S4, Rb Sm2 Cu S4, Cs La2 Cu Se4, Cs Sm2 Cu Se4, Rb Er2 Cu3 S5, Cs Gd2 Ag3 Se5, Cs Tb2 Ag3 Se5 and Rb2 Gd4 Cu4 S9. Journal of Solid State Chemistry, 158, pp. 299-306.