Synthesis and structural characterization of Na xSi 136 (0 < x ≤ 24) single crystals and low-temperature transport of polycrystalline specimens

Stevce Stefanoski, Christos D. Malliakas, Mercouri G. Kanatzidis, George S. Nolas

Research output: Contribution to journalArticle

29 Citations (Scopus)


Na xSi 136 clathrate-II single crystals with x = 2.9, 5.1, 8.2, and 14.7 were prepared by a two-step process. In the first step, Na 24Si 136 single crystals were grown from the precursor Na 4Si 4 by reaction of the vapor phase with spatially separated graphite in a closed volume. In the second step, the Na 24Si 136 single crystals were subjected to thermal decomposition in a nitrogen atmosphere at 10 Torr and 405 °C. The Na content was controlled by the duration of thermal decomposition. The structural properties were investigated using single-crystal X-ray diffraction and compared with those of single-crystal Na 24Si 136. The quality of the obtained products also allowed for low-temperature transport property measurements on agglomerates of crystals allowing for an investigation into the low-temperature electrical and thermal properties as a function of Na content.

Original languageEnglish
Pages (from-to)8686-8692
Number of pages7
JournalInorganic Chemistry
Issue number16
Publication statusPublished - Aug 20 2012


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this