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sirljz(金币+3):谢谢交流 2010-04-05 13:08
ll921(金币+10, 翻译EPI+1): 2010-04-09 08:52
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The crystal growth of Zo is made easily by the fact that Zo has a congruent melting point. The molten zone is very stable for the entire duration of the growth procedure. The power, which needs to melt the rods, is about 55％ of the total output power of the lamps. However, there is a serious problem that many bubble inclusions observed in a crystal grown at 10 mm/h with the rotation rate of 30 rpm, which is shown in Fig. 2(a). S.M. Koohpayeh et al.[20], is reported that bubble-free rutile single crystals grows with a 0 rpm rotation rate. In spite of that, lower rotation rates of 10 (sample 1)and 5 (sample 2) are applied to the later work. The crystal wafers cut perpendicular to the growth direction are observed with polarizing microscope. There are few bubble inclusions in the sample 1. Sample 2 which is free of bubble inclusion. In conclusion, a lower rotation rate is effective to suppress the formation of bubble inclusion in growth of Zo crystal. |
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