The framework-deficient clathrate phases Ba7.5Al 13Si29 and Eu0.27Ba7.22Al 13Si29 were prepared using a molten Al flux. Single-crystal X-ray diffraction confirmed the two phases to be clathrate type I (space group Pm3n). For Eu0.27Ba7.22Al 13Si29, single-crystal X-ray diffraction revealed the Eu to partially occupy the 2a position. Microprobe analysis of single crystals provided the stoichiometry, and Raman spectroscopy was used to investigate the guest framework interactions. The Raman spectra are consistent with both Ba 7.5Al13Si29 and Eu0.27Ba 7.22Al13Si29 having minimal guest-host interactions. Magnetic susceptibility data for Eu0.27Ba 7.22Al13Si29 imply weak magnetic ordering and indicate a 2+ oxidation state for the Eu ion.
ASJC Scopus subject areas
- Inorganic Chemistry