Single crystals of the ternary clathrate-I Na8Al8Si38 were synthesized by kinetically controlled thermal decomposition (KCTD), and microcrystalline Na8Al8Si38 was synthesized by spark plasma sintering (SPS) using a NaSi + NaAlSi mixture as the precursor. Na8AlxSi46-x compositions with x ≤ 8 were also synthesized by SPS from precursor mixtures of different ratios. The crystal structure of Na8Al8Si38 was investigated using both Rietveld and single-crystal refinements. Temperature-dependent transport and UV/vis measurements were employed in the characterization of Na8Al8Si38, with diffuse-reflectance measurement indicating an indirect optical gap of 0.64 eV. Our results indicate that, when more than one precursor is used, both SPS and KCTD are effective methods for the synthesis of multinary inorganic phases that are not easily accessible by traditional solid-state synthesis or crystal growth techniques.
Bibliographical noteKAUST Repository Item: Exported on 2021-10-15
Acknowledged KAUST grant number(s): KAUST Faculty Initiated Collaboration grant
Acknowledgements: Y.D., P.C., and G.S.N. gratefully acknowledge support from the U.S. Department of Energy, Basic Energy Sciences, Division of Materials Science and Engineering, under Award DE-FG02-04ER46145 for single-crystal and microcrystalline syntheses; structural analyses; and PXRD, SEM, and EDS measurements and analyses. X.Z. and T.M.T. acknowledge support, in part, from a KAUST Faculty Initiated Collaboration grant and also some funding from Clemson University.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry