주요 논문
3
*2026년 기준 최근 6년 이내 논문에 한해 Impact Factor가 표기됩니다.
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인용수 0
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2026The effect of temperature, pressure, and H2O coverage on surface stability of cubic HfO2 (111) using ab initio thermodynamics
Saroj Thapa, Jong-Yoon Kim, H.T. Kim, Jun-Yeong Jo, Yeong-Cheol Kim
Computational Materials Science
https://doi.org/10.1016/j.commatsci.2026.114647
Adsorption
Phase diagram
Ab initio
Chemical stability
Gibbs free energy
Charge density
Ab initio quantum chemistry methods
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2025Ab-initio Thermodynamic Study of Vapor Pressure of Mo(CO)<sub>6</sub> and Its Initial Surface Reaction on SiO₂ (111) Surface
H. Kim, Saroj Thapa, Sun-Hye Kim, Na-Young Lee, Jong-Yoon Kim, Yeong-Cheol Kim
JSTS Journal of Semiconductor Technology and Science
This study elucidates the sublimation behavior of molybdenum hexacarbonyl (Mo(CO)<sub>6</sub>) based on abinitio thermodynamic calculations. The sublimation temperature of solid Mo(CO)<sub>6</sub> at 1 atm was calculated to be 385K. In addition, the initial reaction mechanism of Mo(CO)<sub>6</sub> on the β-cristobalite SiO2(111) surface was analyzed. Among the considered dissociation pathways, the CO₂-forming pathway, involving the interaction between a CO ligand and a surface oxygen atom, was found to be the most thermodynamically favorable.
https://doi.org/10.5573/jsts.2025.25.5.476
Sublimation (psychology)
Dissociation (chemistry)
Molybdenum
Vapor pressure
Oxygen
Solid surface
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gold
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인용수 0·
2025Ab Initio Thermodynamic Evaluation of Ruthenium Tetroxide (RuO4) Vapor Pressure
Sun-Hye Kim, Jong-Yoon Kim, Hyun-Kyu Kim, Na-Young Lee, H. Kim, Saroj Thapa, Jun-Yeong Jo, Yeong-Cheol Kim
Crystals
In this study, the sublimation and vapor pressure characteristics of RuO4 were systematically investigated using ab initio thermodynamic calculations. Structural optimizations and vibrational frequency analyses were performed for gaseous RuO4 and four candidate solid phases (monoclinic Cm, P21/c, C2/c, and cubic P-43n) within the density functional theory (DFT) framework. Gibbs free energies were evaluated by incorporating electronic energies, zero-point corrections, and entropic contributions from translational, rotational, and vibrational modes. The results identify monoclinic C2/c and cubic P-43n as the most stable solid phases across the studied temperature range. Calculated sublimation temperatures of 322 K at 1 atm and 240 K at 1 × 10−3 atm were obtained in good agreement with experimental melting and boiling points. Calculated vapor pressures show reasonable agreement with experimental measurements below the triple point, with deviations at higher temperatures attributable to approximating liquid-gas behavior using solid-gas sublimation data. These findings provide the first theoretical description of RuO4 vapor pressure and offer a computational framework extendable to other transition-metal ALD precursors.
https://doi.org/10.3390/cryst15110915
Sublimation (psychology)
Vapor pressure
Ab initio
Ab initio quantum chemistry methods
Density functional theory
Monoclinic crystal system
Boiling point