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Analysis of the High-Pressure High-Temperature (HPHT) growth of single crystal diamond

Journal Article · · Journal of Crystal Growth
 [1];  [2];  [3];  [4];  [5];  [5];  [6]
  1. Univ. of Minnesota, Minneapolis, MN (United States); OSTI
  2. Euclid Beamlabs, LLC. Beltsville, MD (United States)
  3. Naval Research Lab. (NRL), Washington, DC (United States)
  4. Ostbayerische Technische Hochschule Amberg-Weiden (OTH), Weiden (Germany); Fraunhofer Institute for Integrated System and Device Technology IISB, Erlangen (Germany)
  5. Fraunhofer Institute for Integrated System and Device Technology IISB, Erlangen (Germany)
  6. Univ. of Minnesota, Minneapolis, MN (United States)
A multi-scale, computational model is developed to describe the growth characteristics of single-crystal diamond in the High-Pressure, High-Temperature (HPHT) process. This model is the first to connect phase-change kinetics governing crystal growth to the continuum transport of carbon through the growth cell. Results show the importance of convective transport driven by buoyant flow in the metallic solvent, which increases the growth rate by nearly an order of magnitude over that obtained under diffusion alone. Parametric studies show how crystal growth may be kinetically-limited or transport-limited, depending on the value of the macroscopic kinetic coefficient. Estimating this kinetic coefficient from growth experiments yields a phase-change Damköhler number of unity, indicating a mixed regime where phase-change kinetics and transport are comparable and strongly coupled in this system. Mechanisms responsible for slowing growth as the crystal size increases are explained. Finally, supersaturation inhomogeneities along the facets of larger crystals are predicted, which may be relevant to solvent inclusion formation during growth.
Research Organization:
Euclid Beamlabs, LLC. Bolingbrook, IL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0020604
OSTI ID:
2421613
Alternate ID(s):
OSTI ID: 1959844
Journal Information:
Journal of Crystal Growth, Journal Name: Journal of Crystal Growth Vol. 609; ISSN 0022-0248
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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