【摘要】 用提拉法,生长了BGS(Bi₁₂Ge_xSi_1-xO₂₀)系列中六种新的低声速单晶材料。晶体尺寸约为15×15×80mm³。BGS系列单晶属等轴晶系,23点群,空间群是I23或I2₁3二者之一,晶格常数为α≈10.11A。密度在9.20×10³kg/m³（BG）至9.30×10³kg/m³（BS）之间。（100）方向的纵波声速υ=3.7×10³m/s,与BG单晶和BS单晶相近。更多还原

【Abstract】 Six kinds of new single crystals of BGS (Bi12 Gex Si(1-x)O20) series with lower sound velocity have been grown using Czochralski method, sizes about 15x15x80 mm3. The single crystals of BGS series belong to cubic system, 23 class, I23 or U2,3 space group. Their cell constants are a=10.11A.The densities are between 9.20x103 kg/m3 (BG) and 9.30x103kg/m3(BS). The velocities of extensional wave in (100) direction are v=3.7x103m/s approaching to that of BG and BS crystal.更多还原