Ultra-low thermal conductivity in Na/Sb chalcobismuthates: Synthesis, crystal structures, optical properties and 23Na NMR spectroscopy
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Chemical Science Program
Physical Science and Engineering (PSE) Division
KAUST Grant NumberBAS/1/1302-01-01
Embargo End Date2020-01-01
Permanent link to this recordhttp://hdl.handle.net/10754/656214
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AbstractThree new quaternary compounds Na2BiSbQ4 (Q = S, Se, Te) have been synthesized by the direct combination reaction between Bi, Sb, Q and the corresponding Na2Q. All phases, sulfide, selenide and telluride, are isostructural and crystallize in the NaCl-type cubic space group Fm3m (no. 225) with lattice constants of a = 5.760(7), 5.964(9) and 6.331(5) Å, respectively. The unique feature of these structures is the existence of only one crystallographic metal site in the unit cell. These mixed position sites provide the desirable lattice complexity with a random distribution of the Na, Bi and Sb atoms. Consequently, extremely low thermal conductivities at room temperature have been observed for the studied phases. All three compounds are semiconductors and their Uv/Vis spectra exhibit redshifts toward narrower bandgap energies from sulfide to selenide to telluride.
CitationAlahmari, F., Dey, S., Emwas, A.-H., Davaasuren, B., & Rothenberger, A. (2019). Ultra-low thermal conductivity in Na/Sb chalcobismuthates: synthesis, crystal structures, optical properties and 23Na NMR spectroscopy. New Journal of Chemistry, 43(27), 10814–10820. doi:10.1039/c9nj01440c
SponsorsThis work was supported by the King Abdullah University of Science and Technology (KAUST) baseline fund BAS/1/1302-01-01.
PublisherRoyal Society of Chemistry (RSC)
JournalNew Journal of Chemistry
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