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Title: Chemical Bonding and Transport Properties in Clathrates-I with Cu–Zn–P Frameworks

Journal Article · · Chemistry of Materials

Here quaternary clathrate-I phases with an overall composition of Ba8M16+yP30-y (M = Cu,Zn) exhibit complex structural chemistry. Characterization of the electronic structures and chemical bonding using quantum-chemical calculations and 31P solid state NMR spectroscopy demonstrated that the Cu–Zn–P framework is flexible and able to accommodate up to six Zn atoms per formula unit via bonding rearrangements, such as partial Zn/P substitution and the formation of Cu–Zn bonds. Such perturbations of the framework’s bonding affect the thermal and charge transport properties. The overall thermoelectric figure-of-merit, ZT, of Ba8Cu14Zn2P30 is 0.62 at 800 K, which is 9 times higher than the thermoelectric performance of the ternary parent phase Ba8Cu16P30. Through a combination of inelastic neutron scattering and single crystal X-ray diffraction experiments at 10 K, low-energy rattling of the Ba guest atoms inside the large tetrakaidecahedral cages are shown to be the reason for the low thermal conductivities observed for the studied clathrates.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1474850
Journal Information:
Chemistry of Materials, Vol. 30, Issue 10; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (3)

Neutron Instruments for Research in Coordination Chemistry: Neutron Instruments for Research in Coordination Chemistry journal January 2019
Synthesis, structure, and transport properties of Ba 8 Cu 16 –  x Au x P 30 clathrate solid solution journal February 2020
Si2Ge: A New VII-Type Clathrate with Ultralow Thermal Conductivity and High Thermoelectric Property journal February 2020

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