Studies on Divalent Thulium Ternary Iodide
WANG Shi-Hua, WANG Mei-Tian
1998, 19(3):
335-339.
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In this paper two types of compounds [ATmI3(A=K, Rb, Cs) and A4TmI6(A=Rb, Cs)] were synthesized by one-step procedure and their crystal structures were determined by X-ray powder diffraction. The crystal structures of CsTmI3, RbTmI3 and KTmI3 are orthorhombic ones. CsTmI3: a =0.8689(3) nm, b =1.2339(4) nm, c =0.8565(3) nm, space group: Pnma, Z =4; RbTmI3: a =1.0381(3) nm, b =0.4686(3) nm, c =1.7256(9) nm; space group: Pnma, Z=4; KTmI3: a =0.4576(2) nm, b =1.5133(20) nm, c = 1.1679(6) nm, space group: Cmcm, Z =4; The linking manner among the structural unit [TmI6] of octahedral in the three kinds of structures are different and they are corner-sharing, edge-sharing and both corner-and edge-sharing separately. The coordination number of atom of Cs, Rb and K decreases orderly and they are 10, 9 and 8. The structures of Cs4TmI6 and Rb4TmI6 belong to K4CdCl6-type(trigonal, space group: R3 c, Z =6). Rb4TmI6: a = 1.41714(9) nm, c =1.7473(1) nm, Cs4TmI6: a =1.4516(1) nm, c =1.8292(2) nm.