Acta Cryst. (2013). C69, 455-459 [ doi:10.1107/S010827011300766X ]
Abstract: Dirubidium pentacadmium tetraarsenide, Rb2Cd5As4, dirubidium pentazinc tetraantimonide, Rb2Zn5Sb4, and the solid-solution phase dirubidium pentacadmium tetra(arsenide/antimonide), Rb2Cd5(As,Sb)4 [or Rb2Cd5As3.00(1)Sb1.00(1)], have been prepared by direct reaction of the component elements at high temperature. These compounds are charge-balanced Zintl phases and adopt the orthorhombic K2Zn5As4-type structure (Pearson symbol oC44), featuring a three-dimensional [M5Pn4]2- framework [M = Zn or Cd; Pn is a pnicogen or Group 15 (Group V) element] built of linked MPn4 tetrahedra, and large channels extending along the b axis which host Rb+ cations. The As and Sb atoms in Rb2Cd5(As,Sb)4 are randomly disordered over the two available pnicogen sites. Band-structure calculations predict that Rb2Cd5As4 is a small-band-gap semiconductor and Rb2Zn5Sb4 is a semimetal.
Formula: Rb2Cd5As4, Rb2Zn5Sb4 and Rb2Cd5(As,Sb)4
Structure factor file (CIF format) (37.8 kbytes)
Structure factor file (CIF format) (39.9 kbytes)
Structure factor file (CIF format) (38.5 kbytes)
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