Chemically driven superstructural ordering leading to giant unit cells in unconventional clathrates Cs8Zn18Sb28 and Cs8Cd18Sb28.

Chemical Science
Bryan Owens-BairdKirill A Kovnir

Abstract

The unconventional clathrates, Cs8Zn18Sb28 and Cs8Cd18Sb28, were synthesized and reinvestigated. These clathrates exhibit unique and extensive superstructural ordering of the clathrate-I structure that was not initially reported. Cs8Cd18Sb28 orders in the Ia3̄d space group (no. 230) with 8 times larger volume of the unit cell in which most framework atoms segregate into distinct Cd and Sb sites. The structure of Cs8Zn18Sb28 is much more complicated, with an 18-fold increase of unit cell volume accompanied by significant reduction of symmetry down to P2 (no. 3) monoclinic space group. This structure was revealed by a combination of synchrotron X-ray diffraction and electron microscopy techniques. A full solid solution, Cs8Zn18-x Cd x Sb28, was also synthesized and characterized. These compounds follow Vegard's law in regard to their primitive unit cell sizes and melting points. Variable temperature in situ synchrotron powder X-ray diffraction was used to study the formation and melting of Cs8Zn18Sb28. Due to the heavy elements comprising clathrate framework and the complex structural ordering, the synthesized clathrates exhibit ultralow thermal conductivities, all under 0.8 W m-1 K-1 at room temperature. Cs8Zn9Cd9Sb28 and Cs8Zn4...Continue Reading

References

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Jan 3, 2020·Journal of the American Chemical Society·Bryan Owens-BairdKirill Kovnir
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Citations

Dec 4, 2021·Chemical Communications : Chem Comm·Philip YoxKirill Kovnir

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Methods Mentioned

BETA
X-ray
transmission
electron diffraction
differential
scanning
single crystal diffraction
differential scanning calorimetry

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