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Verneuil법에 의한 $SrTiO_3$ 단결정 성장
최익서,조현,최종건,오근호,Choi, I.S.,Cho, H.,Choi, J.K.,Orr, K.K. 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.9
Strontium Titanate single crystal is grown by Verneuil method. Feed materials were prepared by coprecipitation method which started with Sr(NO3)2 and TiCl4. SrTiO3 can not be grown from feed materials having the stoichiometric components due to volatilization of SrO, when the powder added more 3 wt% SrO used, the crystal can be grown. Growth conditions that the pressure of oxygen and hydrogen gas was 5 psi, the flow rate of oxygen and hydrogen was 7.3 and 30ι/min respectively, the growth rate was 20 mm/hr were optimum. The grown single crystal has the diameter of 10~15 mm and its length is 30~40 mm. The grown crystal was deep brown color and somewhat transparent. The color of grown crystal was lightened after annealing.
최익도,Choi Ik Do 대한간호협회 1966 대한간호 Vol.5 No.3
The Purpose of collegiate nursing education is to cultivate professional nurse with adequate capabilities and this requires not only specialized knowledge but broad general knowledge, competent technical ability and quart ties of leadership, In order to