Observed Dependence of the Low-Temperature Thermal and Electrical Conductivity of Graphite on Temperature, Type, Neutron Irradiation, and Bromination

Smith, Alan W.; Rasor, N. S.

doi:10.1103/physrev.104.885

Cited by 74 publications

(30 citation statements)

References 9 publications

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“…Thermal conductivity measurements [2] above 5 K on POCO 2 AXM-5Q1 graphite show a similar, but slightly lower conductivity than AGOT [3,4], suggesting it as a possible replacement. This material is readily available.…”

mentioning

confidence: 99%

A replacement for AGOT graphite?

Woodcraft

Duncan

Hastings

2003

Physica B: Condensed Matter

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Pitch bonded graphites are among the best known thermal insulators at sub-Kelvin temperatures. At higher temperatures, however, they are good conductors. Graphite supports can therefore be used to allow a relatively rapid cool-down of structures which must be thermally isolated when cold. The low temperature conductivity of graphites varies by many orders of magnitude depending on the manufacturing process. AGOT graphite is known to be a very good insulator, but is no longer commercially available. We suggest a replacement, and present thermal conductivity measurements demonstrating its suitability.

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mentioning

confidence: 99%

A replacement for AGOT graphite?

Woodcraft

Duncan

Hastings

2003

Physica B: Condensed Matter

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“…SFG powders pressed into pellets at 2 t cm À2 indeed present thermal conductivities typically within the range 50-60 W m À1 K À1 . The latter value is much lower than what is known for natural monocrystalline graphite and pyrographite (2000-3000 and 10 W m À1 K À1 parallel and perpendicular to carbon layers, respectively [49][50][51][52]) due to disorder and to thermal resistances between the grains. However, it is more than 2 orders of magnitude higher than what can be deduced for pure tannin-based carbon, j carb , from the simple model of Ashby for the thermal conductivity of foam j foam , assuming that the latter is only based on conduction (i.e., convection and radiation being negligible) [53]:…”

Section: Physical Properties Of Composite Carbon Foamsmentioning

confidence: 72%

Thermal conductivity improvement of composite carbon foams based on tannin-based disordered carbon matrix and graphite fillers

et al. 2015

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“…Several authors also found a positive temperature coefficient for the DC conductivity below room temperature: Noyes (1924), Buerschaper et al (1944), Maltseva and Marmer (1962), Klein and Straub (1961), Reynolds et al (1953), Tyler et al (1953), Smith and Rasor (1956). The latter three groups, in particular, observed that this tends to occur in artificial graphites (like HOPG), with crystallites much smaller in size than natural graphite crystals.…”

Section: Resultsmentioning

confidence: 94%

Some optical properties of graphite from IR to millimetric wavelengths

Papoular¹

2014

Monthly Notices of the Royal Astronomical Society

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Far infrared(FIR) data on the optical properties of graphite are presently lacking. An important step towards filling this gap was taken by Kuzmenko et al. (2008) who measured, on HOPG (Highly Oriented Pyrolitic Graphite) at normal incidence and from 10 to 300 K, the in-plane dielectric functions from 0.3 to 200 µm, and the reflectance between 0.3 and about 300 µm. We show here how, using recent developments of the electron theory of graphene, extended to graphite, it is possible to properly extrapolate the data farther even than 1000 µm, in effect all the way to DC (Direct Current). The plasma frequency as well as the scattering rate of free electrons are shown to both decrease with T , but level off near 0 K, in agreement with theory. Along the way, we noticed significant discrepancies with the well-known and often used derivation of Philipp (1977) at room temperature, and also with previous data on temperature dependence and absorbance of graphitic material samples in different physical forms. Possible reasons for these discrepancies are discussed. Finally, the absorption efficiency of small graphitic spheres is deduced for the spectral range from 0.3 to 10000 µm. This may contribute to the discussion on model dust candidates for recently observed astronomical far infrared emissions.

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Observed Dependence of the Low-Temperature Thermal and Electrical Conductivity of Graphite on Temperature, Type, Neutron Irradiation, and Bromination

Cited by 74 publications

References 9 publications

A replacement for AGOT graphite?

A replacement for AGOT graphite?

Thermal conductivity improvement of composite carbon foams based on tannin-based disordered carbon matrix and graphite fillers

Some optical properties of graphite from IR to millimetric wavelengths

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