Electrical conductivity of combustion flame synthesized diamond

Ravi, K. V.; Koch, C. A.; Olson, Darin S.; Choong, Ping Sen; Vandersande, Jan W.; Zoltan, L. D.

doi:10.1063/1.111685

Cited by 9 publications

(2 citation statements)

References 3 publications

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“…The new methodologies comprise d.c. plasma, 32,33 radio frequency (RF) plasma, 34,35 d.c. plasma jet, 36,37 microwave plasma jet, 38 electron cyclotron resonance (ECR) microwave plasma, 39,40 and combustion (oxyacetylene or plasma torches) flame synthesis. [41][42][43][44][45][46] Microwave (MW) plasma and hot filament (HF) CVD growth rates are typically between 0.1 and 10 mm h 21 , while values in the range 50-1000 mm h 21 can be achieved by arc-jet and combustion flame synthesis. The other side of the question is the limitations of these methods in terms of coating areas: all techniques affect typically a few cm 2 , with the exception of MW-CVD, which can coat samples in excess of 20 cm diameter.…”

Section: The Chemical Vapor Deposition Processmentioning

confidence: 99%

Synthesis of diamond

Ferro

2002

J. Mater. Chem.

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Diamond is impressive because of its wide range of extreme properties. By most measures, diamond is 'the biggest and best': it is the hardest known material, has the lowest coefficient of thermal expansion, is chemically inert and wear resistant, offers low friction, has high thermal conductivity, and is electrically insulating and optically transparent from the ultraviolet to the far infrared. Diamond already finds use in many different applications including, of course, its use as a precious gem, but also as a heat sink, as an abrasive, and as inserts and/or wear-resistant coatings for cutting tools. Obviously, it is possible to envisage many other potential applications for diamond as an engineering material, but progress in implementing many such ideas has been hampered by the comparative scarcity of natural diamond. This paper reports on the progress of the long running quest for ways to synthesize diamond in the laboratory

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Section: The Chemical Vapor Deposition Processmentioning

confidence: 99%

Synthesis of diamond

Ferro

2002

J. Mater. Chem.

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“…Mechanisms governing the evolution of the charge formation, electrical conductivity and domain polarization during the combustion synthesis have still not been established. In particular, very few studies have determined the electrical conductivity during the combustion synthesis [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Complex dielectric behaviour during formation of BaTiO₃by combustion synthesis

Martirosyan

Nawarathna

Claycomb

et al. 2006

J. Phys. D: Appl. Phys.

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Complex dielectric behaviour was observed during the combustion synthesis of polycrystalline barium titanate in the presence of a 0.1–100 kHz ac electrical field. The ac conductivity (σ) and relative dielectric permittivity (ε) attained their maximum values during the initial stage of the combustion at ∼850 °C before the temperature reached its maximum (∼1340 °C) and before complete conversion of the reactants to the product BaTiO3. The duration of the ac conductivity and relative dielectric permittivity at 0.1 kHz were much shorter (∼90 ms) than at 100 kHz (∼3 s). The low frequency response is probably dominated by massive charge carriers (O2−, Ti4+ Ba2+), while that at high frequency by light charge carriers (electrons, holes). The temporal ac conductivity, relative dielectric permittivity and temperature suggest that most charge carriers were generated when the reaction rate was maximal.

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