KRS-5 single crystals have been grown in three kinds of atmospherest air, Ar and Ar+I_2. The scattering centers in crystals were examined and the metal impurities and oxygen content of the crystals were analysed.

• 在空气、流通氩气和Ar+I_2混合气体等气氛条件下生长出KRS-5单晶,检查了晶体中的散射,分析了晶体中金属杂质和氧含量。