THE GROWTH OF NEW SINGLE CRYSTALS OF BGS (Bi₁₂Ge_xSi_1-xO₂₀) SERIES WITH LOW SOUND VELOCITY USING CZOCHRALSKI METHOD

Six kinds of new single crystals of BGS (Bi₁₂ Ge_x Si(_1-x)O₂₀) series with lower sound velocity have been grown using Czochralski method, sizes about 15×15×80 mm³. The single crystals of BGS series belong to cubic system, 23 class, I23 or U2,3 space group. Their cell constants are α≈10.11Å.
The densities are between 9.20×10³ kg/m³ (BG) and 9.30×10³kg/m³(BS). The velocities of extensional wave in (100) direction are v=3.7×10³m/s approaching to that of BG and BS crystal.