Journal ArticleDOI
Thermodynamic approach to the paradox of diamond formation with simultaneous graphite etching in the low pressure synthesis of diamond
Nong M. Hwang,Duk Y. Yoon +1 more
TLDR
In this article, the atomic hydrogen hypothesis is strongly supported by experimental observations of diamond deposition with simultaneous graphite etching, and the experimental observations could be successfully explained without violating thermodynamics by assuming that the diamond phase had nucleated in the gas phase as fine clusters.About:
This article is published in Journal of Crystal Growth.The article was published on 1996-03-01. It has received 67 citations till now. The article focuses on the topics: Diamond & Material properties of diamond.read more
Citations
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Thermodynamics of metastable phase nucleation at the nanoscale
C.X. Wang,Guowei Yang +1 more
TL;DR: In this paper, the authors proposed a universal thermodynamic approach on nanoscale to elucidate the formation of the metastable phases taking place in the micro-phase growth, which was used to study the theory of nucleation and growth of diamond nanowires inside diamond nanotubes.
Journal ArticleDOI
Understanding of Homogeneous Spontaneous Precipitation for Monodispersed TiO2 Ultrafine Powders with Rutile Phase around Room Temperature
TL;DR: In this paper, the authors obtained monodispersed TiO 2 ultrafine particles from aqueous TiOCl 2 solution with a 0.67 M Ti 4+ concentration prepared by diluting TiCl 4 with the homogeneous precipitation process in the range 17-230°C.
Journal ArticleDOI
Charged clusters in thin film growth
Nong-Moon Hwang,Doh-Yeon Kim +1 more
Abstract: A cauliflower structure is a granular film composed of spherical particles similar in size, each with numerous nanoscale nodules on its surface. The structure is produced during certain chemical vapour deposition (CVD) processes for diamond and silicon thin film growth. A classical account in terms of atomic unit deposition fails to explain the growth of such a cauliflower structure, as it requires a gas phase of much higher supersaturation than for onset of diffusion controlled growth. Another interesting and somewhat puzzling phenomenon encountered during a diamond CVD process is that while diamond is depositing on a graphite substrate, carbon atoms in the graphite itself are etched away into the vapour phase; that is, experience evaporation. Again, an elementary kinetic barrier mechanism fails to explain such CVD deposition of a less stable diamond phase combined with simultaneous evaporation of a stable graphite phase. In order to account for such puzzling CVD phenomena and others, a theory o...
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Effect of methane concentration on size of charged clusters in the hot filament diamond CVD process
TL;DR: In this article, negative charged clusters of 3000-18000 atomic mass units were experimentally confirmed under typical process conditions of hot-filament diamond CVD using gas mixtures of 1-5% CH4 and H2.
Journal ArticleDOI
Charged nanoparticles in thin film and nanostructure growth by chemical vapour deposition
Nong-Moon Hwang,Dong-Kwon Lee +1 more
TL;DR: In this paper, the critical role of charged nanoclusters and nanoparticles in the growth of thin films and nanostructures by chemical vapour deposition (CVD) is reviewed.
References
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The Thermo-Calc databank system☆
TL;DR: Using the facilities of Thermo-Calc one can tabulate thermodynamic data, calculate the heat change of chemical reactions and their driving force, evaluate equilibria for chemical systems and phase transformations and calculate various types of multicomponent phase diagrams by an automatic mapping procedure.
Journal ArticleDOI
Low-Pressure, Metastable Growth of Diamond and "Diamondlike" Phases
John C. Angus,Cliff C. Hayman +1 more
TL;DR: Vapor-grown diamond and diamondlike materials may have eventual applications in abrasives, tool coatings, bearing surfaces, electronics, optics, tribological surfaces, and corrosion protection.
Journal ArticleDOI
Vapor growth of diamond on diamond and other surfaces
TL;DR: In this article, the growth rate of homoepitaxial diamond films reached 1 μm/h at 1000°C; film properties were identical to those of bulk crystals.
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Diamond synthesis from gas phase in microwave plasma
TL;DR: In this paper, a crystal diamond predominantly composed of {100} and {111} faces was grown on a non-diamond substrate from a gaseous mixture of hydrogen and methane under microwave glow discharge conditions.