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        • KCI등재

          SiC 기판상의 금속박막의 표면구조 및 임계하중

          임창성 한국결정성장학회 1995 韓國結晶成長學會誌 Vol.5 No.4

          SIC와 금속박막의 반응에 의한 표면구조 및 부착력이 550$^{\circ}C$에서 1450$^{\circ}C$의 온도범위에서 조사되어졌다. SiC/Co계에서는 850$^{\circ}C$ 이상에서, SiC/Ni계에서는 650$^{\circ}C$ 이상에서 여러 가지 규소화물이 형성된 반응이 최초로 나타났다. 코발트는 1050$^{\circ}C$, 0.5 h에서 니켈은 950$^{\circ}C$, 2h에서 SiC와 완전히 반응하여 소모되었다. SiC/Co에서는 CoSi상이 SiC/Ni에서는 Ni$_{2}$Si상이 1250$^{\circ}C$와 1050$^{\circ}C$의 반응에서까지 각각 열역학적으로 안정하게 관찰되어졌다. 탄소는 SiC/Co 반응표면에서는 1450$^{\circ}C$ 이상에서 그리고 SiC/Ni 반응표면에서는 1250$^{\circ}C$ 이상에서의 온도에서 흑연으로 결정화되었다. SiC기판과 금속박막의 임계하중이 scratch test 방법에 의하여 정성적으로 비교되어져, 850$^{\circ}C$에서 1050$^{\circ}C$의 온도범위에서 SiC/Ni couple이 20~33N의 상대적으로 높은 값을 나타내었다. Surface structure and adhesion by the reaction between thin metal films and SiC were studied at temperatures between 550 and $1450^{\circ}C$ for various times. The reaction with the formation of various silicides was initially observed above $850^{\circ}C$ for SiC/Co system and $650^{\circ}C$ for SiC/Ni system. The cobalt reacted with SiC and consumed completely at $1050^{\circ}C$ for 0.5 h and the nickel at $950^{\circ}C$ for 2 h. The observed CoSi phase in SiC/Co and Ni$_2$Si phase in SiC/Ni are thermodynamically stable in the reaction zone up to 125$0^{\circ}C$ and $1050^{\circ}C$ respectively. Carbon was crystallized as graphite above $1450^{\circ}C$ for SiC/Co reaction surface and $1250^{\circ}C$ for SiC/Ni. The critical loads of the thin metal films on SiC substrate were qualitatively compared in terms of the scratch test method. At temperatures between 850 and $1050^{\circ}C$, relatively higher values of 20~33 N were observed for SiC/Ni couples.

        • KCI등재

          Microwave-Modified Sol-Gel Process for Microcystalline KY(WO4)2: Ho3+/Yb3+ Phosphors and their Upconversion Photoluminescence Properties

          임창성 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.6

          KY1-x(WO4)2:Ho3+/Yb3+ yellow phosphors with doping concentrations of Ho3+ and Yb3+ (x = Ho3+ + Yb3+, Ho3+ = 0.05, 0.1, 0.2 and Yb3+ = 0.2, 0.45) were successfully prepared using the microwave-modified sol-gel method; their upconversion (UC) photoluminescence properties were investigated in detail. Well-crystallized particles, formed after heat-treatment at 900°C for 16 h, showed a fine and homogeneous morphology with particle sizes of 2-5 μm. Under excitation at 980 nm, the UC KY0.7(WO4)2:Ho0.1Yb0.2 and KY0.5(WO4)2Ho0.05Yb0.45 particles exhibited excellent yellow emissions based on a strong 545-nm emission band in the green region and a very strong 655-nm emission band in the red region. Pump power dependence and Commission Internationale de L'Eclairage chromaticity of the UC emission intensity were evaluated. The spectroscopic properties were examined comparatively using Raman spectroscopy.

        • KCI등재SCOPUS
        • KCI등재

          Synthesis of Microwave Sol–Gel Derived NaCaLa(WO4)3:Ho3+/Yb3+ Phosphors and Their Spectroscopic Properties

          임창성 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.9

          Ho3+/Yb3+ co-doped NaCaLa1−x(WO4)3 ternary tungstates with the proper concentrations of doping for Ho3+ and Yb3+ (x = Ho3+ + Yb3+, Ho3+ = 0, 0.05, 0.1, and 0.2, and Yb3+ = 0, 0.2, and 0.45) were precisely synthesized using the sol–gel method assisted by the microwave technique; their upconverted spectroscopic properties were studied in detail. The particles provided well-crystallized morphology with a homogeneous and fine morphology, showing the grain sizes of 2–5 µm. After the low excitation at 980 nm, the NaCaLa0.7(WO4)3:Ho0.1/Yb0.2 and NaCaLa0.5(WO4)3:Ho0.05/Yb0.45 ternary tungstates provided strong upconverted yellow emissions, which are based on a strong green emission band of 545 nm and a strong red emission band of 655 nm. The optimal Yb3+:Ho3+ ratio was obtained to be 9:1, as indicated by the composition-dependent quenching effect of Ho3+ ions. The Raman spectra for the doped ternary tungstates showed the presence of strong peaks at higher frequencies, which were superimposed by strong Ho3+ luminescence lines. The dependence of pump power and Commission Internationale de L'Eclairage (CIE) chromaticity of the upconverted emission intensity was investigated in detail.

        • KCI등재

          Upconversion Photoluminescence Properties of KGd(WO4)2:Ho3+/Yb3+ Phosphors Synthesized by Microwave-assisted Sol-Gel Method

          임창성 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.1

          Double tungstate KGd1−x(WO4)2:Ho3+/Yb3+ phosphors with doping concentrations of Ho3+ and Yb3+ (x=Ho3++Yb3+, Ho3+ = 0.05, 0.1, 0.2, and Yb3+ = 0.2, 0.45) were successfully synthesized by the microwave- assisted sol-gel method, and the upconversion (UC) mechanisms by a two-photon process have been investigated in detail. Well-crystallized particles, formed after heat-treatment at 900 ?C for 16 h, showed a fine and homogeneous morphology with particle sizes of 2–10 μm. Under excitation at 980 nm, the UC intensities of KGd0.7(WO4)2:Ho0.1Yb0.2 and KGd0.5(WO4)2Ho0.05Yb0.45 particles exhibited yellow emissions based on a strong 550-nm emission band in the green region and a strong 655-nm emission band in the red region, which were assigned to the 5S2/5F4!5I8 and 5F5!5I8 transitions, respectively. The Raman spectra of the particles indicated the appearance of strong peaks at higher frequencies (1050, 1106, 1250, and 1340 cm−1).

        • KCI등재

          Microwave-modified sol-gel preparation of La2(MoO4)3:Er3+/Yb3 particles and their upconversion photoluminescence properties

          임창성 한국분석과학회 2014 분석과학 Vol.27 No.6

          La2-x(MoO4)3:Er3+/Yb3+ particles with doping concentrations of Er3+ and Yb3+ (x = Er3+ + Yb3+, Er3+= 0.05, 0.1, 0.2 and Yb3+ = 0.2, 0.45) were successfully prepared by the microwave-modified sol-gel method,and the upconversion photoluminescence properties were investigated. Well-crystallized particles, formed afterheat-treatment at 900 °C for 16 h, showed a fine and homogeneous morphology with particle sizes of 2-5 μm. Under excitation at 980 nm, La1.7(MoO4)3:Er0.1Yb0.2 and La1.5(MoO4)3:Er0.05Yb0.45 particles exhibited a strong525 nm emission band, a weak 550 nm emission band in the green region, and a very weak 655 nm emissionband in the red region. The Raman spectra of the doped particles indicated the presence of strong peaks athigher frequencies of 752, 846, 922, 1358 and 1435 cm−1 and lower frequency of 314 cm−1 induced by thedisorder of the [MoO4]2− groups with the incorporation of the Er3+ and Yb3+ elements into the crystal latticeor by a new phase formation.

        • KCI등재SCOPUS

          Interface chemistry and kinetics induced by SiC/Co solid state reactions

          임창성 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.1

          Interfacial chemistry and kinetics induced by SiC/Co solid state reactions were investigated at temperatures between 850 oC and 1450 oC for various times. The reaction mechanisms and the typical layer sequence in the reaction zone are discussed under the consideration of reaction kinetics and thermodynamics. The formation of silicides and carbon was first observed above 850 oC. At 1050 oC, and as the reaction proceeded, the initially formed Co2Si layer was converted to CoSi. The deposited cobalt thin film reacted completely with SiC after annealing at 1050 oC for 0.5 h. The thermodynamically-stable CoSi was the only observed silicide in the reaction up to 1450 oC. Reaction kinetics are proposed to estimate the effective reaction constant from parabolic growth of the reaction zone. An interfacial model is discussed to interpret the interfacial formation and phase distribution of this system.

        • KCI등재후보SCOPUS

          Microwave-assisted synthesis of nanocrystalline ZnWO4 powders via a waterbased citric acid complex precursor

          임창성,심광보,오원춘,Jeong,Ho,Ryu 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.4

          Nanocrystalline ZnWO4 powders were successfully synthesized from a water- based citric acid complex precursor using microwave irradiation. The polymeric precursors were heat treated at temperatures from 300 to 600 oC for 3 h. Crystallization of the ZnWO4 was detected at 400 oC and entirely completed at a temperature of 600 oC. The powders at 400 and 500 oC showed primarily a co-mixed morphology with spherical and silkworm-like forms. The powders at 500 oC had a relatively more homogeneous morphology, while the powders at 600 oC showed a relatively exaggerated growth a including rectangular form. The average crystalline sizes were 18~25 nm, showing an ordinary tendency to increase with temperature from 400 to 600 oC.

        • KCI등재

          Upconversion Photoluminescence Properties of PbY2(MoO4 )4:Er3+/Yb3+ Phosphors Synthesized by Microwave Sol–Gel Method

          임창성 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.4

          PbY 2− x (MoO4 )4:Er3+/Yb3+ phosphors with the correct doping concentrations of Er3+ and Yb3+ (x = Er3+ + Yb3+, Er3+ = 0.05, 0.1, 0.2, and Yb3+ = 0.2, 0.45) were successfully synthesized using the microwave sol–gel method; their upconversion photoluminescence properties were investigated in detail. Well-crystallized particles, formed after heat-treatment at 900 °C for 16 h, showed a fine and homogeneous morphology with particle sizes of 2–5 µm. Under excitation at 980 nm, the PbY 1.7(MoO4 )4:Er0.1 Yb 0.2 and PbY 1.5(MoO4 )4:Er0.05 Yb 0.45 particles exhibited a strong 525-nm emission band, a weak 550-nm emission band in the green region, and a very weak 655-nm emission band in the red region. The Raman spectra of the doped particles indicated the presence of strong peaks at higher and lower frequencies induced by disordered structures of PbY 2− x (MoO4 )4 by the incorporation of the Er3+ and Yb3+ ions into the crystal lattice, which resulted in the unit cell shrinkage accompanying the new phase formation of the MoO 4−x group.

        • KCI등재SCOPUS

          Preparation and characterization of Ag incorporated ZnWO4/zeolite composites by cyclic microwave metathetic method

          임창성,Jeong,Ho,Ryu,Jong,Geun,Choi,Chong,Yeon,Park,오원춘 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.2

          A solid-state metathetic (SSM) route assisted by cyclic microwave irradiation was used to synthesize the Ag incorporated ZnWO4/zeolite composites under environmentally friendly conditions. The crystallized Ag incorporated ZnWO4/zeolite composites were formed at 600 oC for 3 h, showing a well immobilized morphology with sizes of 3-5 μm. The synthesized Ag incorporated ZnWO4/zeolite composites were characterized by scanning electron microscopy, energy-dispersed X-ray spectroscopy and Fourier transform infrared spectroscopy. Monoclinic-like crystals of ZnWO4 were primarily co-mixed with zeolite. Small spherical silver particles were immobilized in the ZnWO4/zeolite matrix.

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