Single crystal growth and structure analysis of type-I (Na/Sr)-(Ga/Si) quaternary clathrates.

ABSTRACT: Single crystals of (Na/Sr)-(Ga/Si) quaternary type-I clathrates, Na_8-y Sr _y Ga _x Si_46-x , 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 Na_8-y Sr _y Ga _x Si_46-x 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.

SUBMITTER: Urushiyama H 

PROVIDER: S-EPMC9064156 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature