TlCu4S3, TlCu4Se3, KCu4Se3, RbCu4Se3, CsCu4S3and CsCu4Se3were prepared by direct synthesis or by the carbonate melt method. They are isotypic with KCu4S3, space group P4/mmm,Z=1. The lattice parameters are: TlCu4S3:a=3.894(1)Å,c=9.33(1)Å, TlCu4Se3:a=3.974(4)Å,c=9.84(2)Å, KCu4Se3:a=3.963(4)Å,c=9.81(3)Å, RbCu4Se3:a=4.048(2)Å,c=9.86(1)Å, CsCu4S3:a=3.964(3)Å,c=9.67(1)Å,and CsCu4Se3:a=4.091(2)Å,c=10.08(1)Å. The crystal structure of TlCu4S3was refined from single crystal diffractometer data. Isotypy of the other compounds was checked by visual inspection of rotating crystal orDebye Scherrerfilm intensities. The relationship between the crystal structures of the MCu4X3-phases, the TlT2X2-phases (ThCr2Si2type) and the anti-CaF2ty
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