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RISS 인기검색어
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- 저자 : 장영남 ( Jang Yeong Nam ) (검색결과 2 건)
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장영남,김문영,배인국,Jang, Yeong-Nam,Kim, Mun-Yeong,Bae, In-Guk 한국결정학회 1990 韓國結晶學會誌 Vol.1 No.1
할로겐 램프를 열원으로 하는 image furnace를 사용하여 소위 traveling solvent floating zone법에 의해 Mg TiO3(가이킬라이트) 고용체 단결정을 육성했다. 육성된 결정은 직경 8mm, 길이 100mm이였으며 성장측은(1010)이었다. MgTiO, 상은 고온에서 일정한 공용영역을 나타내고 있으며 완만한 속도로 냉각시키면 TiO, 성분이 결정학적 방위의 콘트롤을 받아 (0001)면에 평행하게 용출됨으로써 광채효과를 나타낸다. 육성된 boul은 검은색을 띠고 있으나 1100℃ 산소분위기에서 annealing시킬 경우 반투명한 단양한 색깔을 보여 준다. 따라서 가이킬라이트는 새로운 종류의 인공캣츠아이로 활용될 수 있다. Single crystals of the peritectic compound MgTiO3 up to 8 m diameter and 100mm long along the [1010] axis. were yon by the travelling solvent floating zone technique using a halogen lamp image furnace. The grown single crystal. which shows a solid solution range at high temperature, exsolves TiO2 component if it is annealed very slowly to room termperature. Grown boules were black but become translucent with pinkish brown color after tempering at 1100 t for 8-10 hours in oxygen atmosphere and showed distint chatoyancy along the (0001) plane. The grown crystal can be used as a new modified cat's eye gemstone. The optimum conditions were as follows ;Sintering temperature of the charge rod, 1300℃ the growth rate, 2-2.5mmh and the composition of the charge rod in molar ratio. MgO : TiO2 : 1:1.05.
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고준위 방사성폐기물의 고정화를 위한 Fe-석류석 합성 연구
채수천 ( Chae Su Cheon ),장영남 ( Jang Yeong Nam ),배인국 ( Bae In Gug ) 한국광물학회 2003 광물과 암석 (J.Miner.Soc.Korea) Vol.16 No.4
Garnet has been considered as a possible matrix for the immobilization of radioactive actinides. It is expected that Fe-based garnet be able to have the high substitution ability of actinide elements because ionic radius of Fe in tetrahedral site is larger than that of Si of Si-based garnet. Accordingly, we synthesized Fe-garnet with the batch composition of Ca_(2.5)Ce_(0.5)Ze₂Fe₃O_(12) and Ca₂CeZrFeFe₃O_(12) and studied their phase relations and properties. Mixed samples were fabricated in pellet forms under the pressure of 400 ㎏/㎠ and were sintered in the temperature range of 1100- 1400℃ in atmospheric conditions. Phase identification and chemical composition of synthesized samples were analyzed by XRD and SEMIEDS. In results, where the compounds were sintered at 1300℃, we optimally obtained Fe-garnets as the main phase, even though some minor phases like perovskite were included. The compositions of Fe-garnets synthesized from the batch compositions of Ca_(2.5)Ce_(0.5) Zr₂Fe₃O_(12) and Ca₂CeZrFeFe₃O_(12), are Ca_(2.5-3.2)Ce_(0.3-0.7)Zr_(1.8-2.8)Fe_(1.9-3.2)O_(12) and Ca_(2.2-2.5)Ce_(0.8-1.0)Zr_(1.3-21.6)Fe_(0.4-0.7)Fe_(3-3.2)O_(12) respectively. Ca contents were exceeded and Ce contents were exceeded or depleted in 8-coodinated site, comparing to the initial batch composition. These results were caused by the compensation of the difference of ionic radius between Ca and Ce.
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