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- 저자 : 오근호 (검색결과 151 건)
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Flux법에 의한 초전도체 YBa2Cu3O7-x 단결정 육성
오근호,김호건,명중재 한국세라믹학회 1990 한국세라믹학회지 Vol.27 No.1
YBa2Cu3O7-x(=YBCO) single crystals were grown by flux method and the growing process of crystals was investigated. YBCO and 3BaO-7CuO composition powders were mixed by the ratio of 25 : 75(wt%), and the mixtures were melted at 105$0^{\circ}C$ in a electric furnace with no temperature-gradient. Then the melt was cooled at a rate 2-1$0^{\circ}C$/h in the above furnace. YBCO single crystal plate with average size of $1.5\times$2.0$\times$0.1㎣ were obtained in the cavities between crucible and solidified ingot, and the single crystals were oriented to <001> direction. The ingots of flux parts were analyzed by XRD and EDS for the purpose of presuming the growing process of the crystals. It was assumed that the divorced eutectic reaction, by which YBCO crystals were grown first and then BaCuO2 and CuO crystals, occured in the case of cooling rate faster than 2$^{\circ}C$/h. When the cooling rate was 2$^{\circ}C$/h, it was assumed that quasi-equilibrium eutectic reaction occured, so that YBCO, BaCuO2 and CuO crystals were grown at the same time.
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JKACG의 제1권(1991)부터 제5권(1995)까지 발표된 논문의 검토 : (I) Bulk 단결정성장 연구를 중심으로
오근호,심광보,임창성 한국결정성장학회 1996 韓國結晶成長學會誌 Vol.6 No.1
1991년부터 1995년까지 한국결정성장학회지에 발표된 연구 내용을 토대로 국내 Bulk 단결정연구현황을 단결정성장법과 연구팀별로 종합적으로 정리하였다. The research activities on the bulk crystal growth presented in the journal of the Korean Association of Crystal Growth from 1991 to 1995 have been reviewed.
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JKACG의 제1권(1991)부터 제5권(1995)까지 발표된 논문의 검토 : (II) 박막 결정성장 연구를 중심으로
오근호,심광보,임창성 한국결정성장학회 1996 韓國結晶成長學會誌 Vol.6 No.2
1991년부터 1995년까지 한국 결정성장학회지에 발표된 연구 내용을 토대로 국내의 박막 결정성장 연구현항을 종합적으로 정리하였다. The research activities on the thin film crystal growth presented in the Journal of the Korean Association of Crystal Growth form 1991 to 1995 have been reviewed.
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최종건,오근호,S, Kimura 한국세라믹학회 1986 한국세라믹학회지 Vol.23 No.1
By the floating zone method with infrared radiation convergence type heater homogeneously $Cr^{3+}$ doped alu-mina single crystal was obtained. And sizx {1010} facets appeared at the surface of [0001] grown crystals. $ZrO_2$ and $HfO_2$ precipitated as secondary phase and were not doped in the crystals. We found that the dist-ribution of the secondary phase which was mainly located at the surface and the peripheral region was closely related to the flow pattern of melt zone.
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오정훈,오근호,이종근,김도경,이준근,김종희 한국세라믹학회 1985 한국세라믹학회지 Vol.22 No.1
Hard shaped bodies are made by sintering a cold-pressed compact of a boron carbide compound which contains a densification aid. Titanium diboride and carbon were used as a densification aid in a range of 1% to 10% by weight. The effects of sintering temperature and additives on linear shrinkage porosity hardness bend strength and microstructure were examined. The initial partical size dependence on the sintered density was also discussed.
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Vertical Bridgman-Stockbarger법에 의한 Silicon 단결정 성장
심광보,오근호 한국세라믹학회 1985 한국세라믹학회지 Vol.22 No.2
Silicon single crystals were grown bynon-seeded vertical Brdgmen-Stockbarger technique. Optimum growth rate appeared 5mm/hr in the system. It was identified that the preferential orientation using by the optical microscope resulted in <100> direction.
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정대식,오근호 한국세라믹학회 1984 한국세라믹학회지 Vol.21 No.3
To study interface between crystals grown and molten state in the crusible. Pulling and rotating rate of the shaft were varied in LiF crystal growth by Czochralski method. Lower speed of the pulling and rotating rate increased the degree of convexity in solid-liquid interface and higher speed of the pulling and rotating rate decreased it. Optimum condition of LiF crystal growth obtained as pulling rate was 6.5cm/h when it rotated as 46rpm.
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불소운모 합성에 따른 $K_2O-MgO-Al_2O_3-SiO_2-MgF_2$계의 연구
송경근,오근호,김대웅 한국세라믹학회 1983 한국세라믹학회지 Vol.20 No.1
An attempt was made to derive a possible synthetic mechanism of Fluoro-phlogopite (Mica, 4Mg.$Al_2O_3$.$6SiO_2$.$K_2O$.$2MgF_2$) The pevention of fluorine vaporization turned out to be the key in the synthesis of Mica in question.l Consequently the quinary system of Mica was seperately synthesized ; frist 4MgO.$Al_2O_3-6SiO_2$(ternary system) was sintered at 135$0^{\circ}C$ and $K_2O$ and $MgF_2$ were added and second 4MgO.$Al_2O_3-6SiO_2$.$K_2O$ (quarternary system) was heat-treated at 135$0^{\circ}C$ and $MgF_2$ was added. The ternary system resulted in Proto-enstatite Cordierite and Spinel phases while Forsterite and Leucite were shown in the quarternay system . In both methods Fluoro-phlogopite was systhesized but the solid state reactions to form Mica from the ternary system and the quarternary system were different. High temperature reactions in the formation of Mica were investigated employing XRD, DTA and SEM The study of the synthesis of Mica indirectly suggested a method of phase analysis of quinary system(MgO-$Al_2O_3-SiO_2-K_2O-MgF_2$) and quarternary system(MgO-$Al_2O_3-SiO_2-K_2O-MgF_2$) at various temperatures.
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송경근,오근호,이경희 한국세라믹학회 1982 한국세라믹학회지 Vol.19 No.2
Fluoro-phlogopite crystals (Mica) were synthesized by two different methods; firstly the crystal was crystallized from the melts, and secondly mica crystalline was obtained from the direct solid state reaction. Addition of $CaF_2$ in the mica batch revealed the lowering the solid state reaction temperature. SEM and XRD were employed to observe mica crystalline flakes and solid solution forms. As a starting raw material Pyrophyllite was used resulting in the formation of mica crystals.
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Willemite 형광체의 Photo-Luminescence 특성에 관한 연구
장창섭,오근호,이종근 한국세라믹학회 1984 한국세라믹학회지 Vol.21 No.3
Willemite phosphor is a good one having excellent luminescence efficiency that it;s emission wavelength is in the range of about 525 nm. The energy band gap of this willemite phosphor is about 4.1 eV. When the ratio of ZnO/SiO is 1.8 and Mncl in used as activator source the phosphor has the value of maximum luminescence efficiency. The characteristic of willemite phosphor is tendency of the dependence of temperature. The willemite which was fired with activator after being synthesized at initial firing without activator shows higher value of luminescence efficiency than willemite which was fired with activator in initial stage, When the concentration of activator is 1-1.5mol% it has its most favorite condition and the value of luminescence efficiency decreases according to increasement of activator concentration.
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