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Updated: Sep 24, 2025

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
Published on: February 11, 2012
Single crystal growth and structure analysis of type-I (Na/Sr)-(Ga/Si) quaternary clathrates
Hironao Urushiyama1,2, Haruhiko Morito3, Hisanori Yamane1
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University 2-1-1 Katahira, Aoba-ku Sendai 980-8577 Japan.
Abstract:
Single crystals of (Na/Sr)-(Ga/Si) quaternary type-I clathrates, Na8- Sr Ga Si46- , were synthesized by evaporating Na from a mixture of Na-Sr-Ga-Si-Sn in a 6 : 0.5 : 1 : 2 : 1 molar ratio at 773 K for 12 h in an Ar atmosphere. Electron-probe microanalysis and single-crystal X-ray diffraction revealed that three crystals from the same product were Na8- Sr Ga Si46- with x and y values of 7.6, 2.96; 8.4, 3.80; and 9.1, 4.08. It was also shown that increasing the Sr and Ga contents increased the electrical resistivity of the crystal from 0.34 to 1.05 mΩ cm at 300 K.
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