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Journal of the Korean Crystal Growth and Crystal Technology is an official publication of the Korean Association of Crystal Growth (KACG), launched in 1991. The journal publishes 6 issues per year filled with reports of original research and review articles. The peer-reviewed articles contain records of original research that cover diverse theoretical and experimental aspects of crystal growth, crystal technology and related applications. Material categories of interest include but are not limited to: metals, inorganic materials, organic materials, biological materials, semiconductors, polymers, medical/medicinal materials, and newly discovered materials. Theoretical and experimental research and reviews that relate to single- and poly-crystalline materials, powders, liquid crystals and thin films are welcome including those in the following fields; Theory of nucleation, crystallization and growth Modeling and simulation of crystallization and growth Development of growth technique and equipment Characterization of structural and physical properties Other crystal growth-related areas The official title of the journal is “Journal of the Korean Crystal Growth and Crystal Technology (JKCGCT)”. Abbreviated title is “J. Korean Cryst. Growth Cryst. Technol.”. Manuscripts should be submitted to the editorial office by on-line and the submitted manuscripts are peer-reviewed by two reviewers. The manuscript text may be written in Korean or English. The title, abstract, keywords, and references should be written in English. All of the articles published in the JKCGCT are indexed in DOI/Crossref. The citation information and bibliographic information on the JKCGCT is listed in ESCI (Emerging Sources Citation Index) & KCI (Korea Citation Index).
Current Issue : 2022, Vol.32, No.5
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4H-SiC bulk single crystal growth using recycled powder
Im Gyu Yeo | Jae Yoon Lee | Myong Chuel Chun | 2022, 32(5) | pp.169~174 | number of Cited : 0Abstract PDFThis study is to verify the feasibility of SiC single crystal growth using recycled SiC powder. The fundamental physical properties such as particle size, shape, composition and impurities of the recycled powder were analyzed, and the sublimation behavior occurring inside the reactor were predicted using the basic data. As a result of comprehensive judgment,the physical properties of the recycled powder were suitable for single crystal growth, and single crystal growth experiments were conducted using this. 100 mm 4H-SiC single crystal ingot with a height of 25 mm was grown without poly type inclusion. In the case of micro-pipe density was 0.02 ea/cm² and resistivity characteristics was 0.015~0.020 ohm·cm², commercial level quality was obtained, but additional analysis related to dislocation density and stacking faults is required for device application. -
Effect of sintering temperature on microstructure and dielectric properties in (Dy, Mg)-doped BaTiO₃
Woojongwon | Sung-Hyun Kim | Moonhee Choi and 1 other persons | 2022, 32(5) | pp.175~182 | number of Cited : 0Abstract PDFRare-earth elements were doped with Mg to enhance the temperature stability of dielectric properties of BaTiO₃ for its application to MLCC (Multi-Layer Ceramic Capacitor). The additives strongly affect both grain growth and densification behaviors during sintering, and hence dielectric properties. The additive effects therefore should be examined in each system with different additives. This study investigated the crystal structure, grain growth and densificationbehaviors and related variations in dielectric constant with respect to sintering temperature. Dielectric constant appears to be varied with grain size in a temperature range between 1200 and 1300°C, suggesting the importance of grain size control. The temperature dependence of grain size variation was well explained by an established theory correlating the grain growth behavior with grain boundary structure. This accordance provides a basis for sintering technique to control grain growth thus to improve dielectric constant in rare-earth doped BaTiO₃. -
Park Hyun Jung
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Lee， Jong-Kook
| 2022, 32(5)
| pp.183~190
| number of Cited : 0
Abstract PDFDiopside (CaMgSi₂O₆) is known to have high bioactivity as well as excellent mechanical properties. In this study, we tried to improve the bioactivity of zirconia ceramics by surface coating of diopside and its bioactivity was investigated through an in vitro test. Surface coating on zirconia substrate was prepared by sol-gel method using a diopside sol which was prepared by dissolving Ca(NO₃)₂·4H₂O, MgCl₂·6H₂O and Si(OC₂H₅)₄ in ethanol with a fixed molar ratio andthen hydrolysis. To examine the bioactivity of diopside coating, we examined the surface dissolution and the precipitation of new hydroxyapatite particles through in vitro test in SBF (Simulated Body Fluid) solution. Dense and thick diopside coating layers could be fabricated on zirconia substrate by sol-gel method. Also, we confirmed that they contained high bioactivity from the in vitro test, indicated the precipitation of hydroxyapatite particles after the 14 days immersion in SBF solution. In addition, we checked that the bioactivity of diopside coated layers was dependent on the repeated coating cycle and coating thickness.