高的烧结温度和长的保温时间使结晶更加充分，样品致密度更好，但是也造成偏离化学计量比的加剧。
High sintering temperature and long maintaining time lead to the sufficient crystallization and the full densification, but result in the worsening of the deviation from the stoichiometry.
高温下CaF2的挥发造成了在晶体生长后期熔体中组分偏离化学计量比，出现组分过冷，形成包裹物。
The volatilization of CaF2 at a high temperature causes the deviation in composition from the stoichiometry, which results in the formation of inclusions and an increase in the dislocation density.
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