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Title: Synthesis, structure, and transport properties of Ba8Cu16 – xAuxP30 clathrate solid solution

Journal Article · · Journal of Applied Physics
DOI: https://doi.org/10.1063/1.5134080 · OSTI ID:1599456

In this work, a new clathrate solid solution Ba8Cu16 – xAuxP30 (x = 4, 8, 12) was synthesized by a high-temperature solid-state annealing method. The crystal structures of Ba8Cu16 – xAuxP30 were determined by single crystal x-ray diffraction. This clathrate solid solution crystallizes in the orthorhombic superstructure of clathrate-I type with 23 crystallographically independent framework sites, eight of them are occupied by Au/Cu and 15 are exclusively occupied by P atoms. The distribution of Au and Cu atoms over these eight framework sites is not random with a clear preference for Au to occupy the largest (Au/Cu)P4 tetrahedra in the framework. The thermal stability and thermoelectric properties of the Ba8Cu16 – xAuxP30 solid solution were evaluated. Low thermal conductivity was achieved for Ba8Cu16 – xAuxP30 due to the combination of the host–guest crystal structure with rattling Ba atoms with the presence of heavy Au atoms and substitutional Cu/Au disorder in the clathrate framework.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0008931; AC02-06CH11357
OSTI ID:
1599456
Alternate ID(s):
OSTI ID: 1596889
Journal Information:
Journal of Applied Physics, Vol. 127, Issue 5; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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