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Title: From Three-Dimensional Clathrates to Two-Dimensional Zintl Phases AMSb2 (A = Rb, Cs; M = Ga, In) Composed of Pentagonal M–Sb Rings

Journal Article · · Inorganic Chemistry

Three new antimonide Zintl phases, RbGaSb2, CsGaSb2, and CsInSb2, were discovered during exploration of corresponding A–M–Sb (A = Rb, Cs; M = Ga, In) ternary systems while searching for new clathrates. The AGaSb2 phases crystallize in the tetragonal space group P42/nmc (No. 137) in the LiBS2 structure type, while CsInSb2 crystallizes in lower symmetry in the orthorhombic space group Cmce (No. 64) in the KGaSb2 structure type with additional disorder of one of the Cs sites. The crystal structures of all three reported AMSb2 compounds are composed of two-dimensional [MSb2] tetrahedral layers separated by Rb+ or Cs+ cations. [MSb2] layers are built from fused M–Sb pentagons and hexagons, which are also the main structural units for A8M27Sb19 clathrate cages. The semiconductor nature of AMSb2 was suggested by band structure calculations and confirmed by transport property characterization. CsGaSb2 is a rare example of an n-type pnictide Zintl phase. Finally, all reported compounds exhibit low thermal conductivity typical for complex antimonides of heavy elements.

Research Organization:
Univ. of California, Davis, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
SC0022288
OSTI ID:
2341311
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 1 Vol. 61; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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