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Title: Synthesis and structural characterization of the type-I clathrates K8AlxSn46–x and Rb8AlxSn46–x (x $$≃$$ 6.4–9.7)

Journal Article · · Acta Crystallographica. Section C, Structural Chemistry (Online)

In this work, exploratory studies in the systems A–Al–Sn (A = K and Rb) yielded the clathrates K8AlxSn46–x (potassium aluminium stannide) and Rb8AlxSn46–x (rubidium aluminium stannide), both with the cubic type-I structure (space group Pm 3 ¯ n, No. 223; a ≃ 12.0 Å). The Al:Sn ratio is close to the idealized A8Al8Sn38 com­position and it is shown that it can be varied slightly, in the range of ca ± 1.5, depending on the experimental conditions. Both the (Sn,Al)20 and the (Sn,Al)24 cages in the structure are fully occupied by the guest alkali metal atoms, i.e. K or Rb. The A8Al8Sn38 formula has a valence electron count that obeys the valence rules and represents an intrinsic semiconductor, while the experimentally determined com­positions 8Al8±xSn38∓x suggest the synthesized materials to be nearly charge-balanced Zintl phases, i.e. they are likely to behave as heavily doped p- or n-type semiconductors.

Research Organization:
Univ. of Delaware, Newark, DE (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0008885
OSTI ID:
1698004
Alternate ID(s):
OSTI ID: 1595738
Journal Information:
Acta Crystallographica. Section C, Structural Chemistry (Online), Vol. 75, Issue 11; ISSN 2053-2296
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

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Figures / Tables (3)