The annealing of thermal conductivity changes in electron-irradiated graphite

Goggin, P. R.; Reynolds, W. N.

doi:10.1080/14786436308211123

Cited by 50 publications

(3 citation statements)

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“…The maximum is about 35 K and the calculated curve has been extended to about 50 K where the agreement with Rosenberg's data is still good. This most probable curve approximately follows Rosenberg's to its upper limit (96 K) where it is some 4 percent above a very recent curve due to Backhand [39] . A smoothly falling curve can be drawn through Backlund's experimental values and this tends to disprove the shallow minimum at about 200 K which had been indicated by Kannuluik [40,41] .…”

Section: Molybdenumsupporting

confidence: 56%

“…A reasonably good link for the immediate sub-normal temperature range has been provided by the recent measurements of Backlund and Langemar [39] over the range 87 to 374 K, and the curve at present regarded as most probable for the thermal conductivity of pure nickel follows their curve fairly closely to a location between the curves of Shelton and Swanger [22] and the highest due to Powell et al [51] . The mean course of these last mentioned curves is followed to the Curie temperature, where a sharp minimum is shown and the curve to about 1400 K is drawn as a straight line again fitting the highest values of Powell et al The uncertainty of much of this curve is probably of the order of ±10 percent.…”

Section: Nickelmentioning

confidence: 81%

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Thermal conductivity of selected materials, part 2

Ho¹,

Powell²,

Liley³

1968

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The metallic elements studied in this report consist of cadmium (solid and liquid states), chromium, lead (solid and liquid states), magnesium (solid and liquid states), molybdenum, nickel, niobium, tantalum, tin (solid and liquid states), titanium, zinc (solid and liquid states), and zirconium. Whereas the seven metallic elements of the first report that were studied in the solid state have cubic crystal structures, of those now considered, only chromium, lead, molybdenum, nickel, niobium, and tantalum have this symmetrical structure.The others can be expected to yield thermal conductivity values that are dependent on the crystal orientation and which may differ for polycrystalline and single crystal samples. For non-cubic metals the recommended values are mainly for randomly oriented polycrystalline samples of each metal, but whenever sufficient data are available for the main crystal directions of single crystals, the thermal conductivities for these directions will also be given.The general method of procedure has followed closely that adopted in the first report [l] . * The Thermophysical Properties Research Center (TPRC) data sheets for each material have been thoroughly updated, the original papers have been critically re-examined and more complete specification tables have been prepared.The method previously adopted for dealing with the thermal conductivity data for metallic elements at low temperatures has again been followed [2-4]. For each metallic element the experimental curve yielding the highest thermal conductivity values in the region of the maximum has been accepted as representative of the values for the sample of the highest purity so far examined. From these data a value of 0 , the impurity-imperfection parameter, has been derived, as indicated previously, and this has been used to calculate thermal conductivity values from 1 K to about 1. 5 T m , where T m is the temperature corresponding to the thermal conductivity maxi-appears to have been investigated, but Mendelssohn and Rosenberg [6] obtained values for a cast polycrystalline sample that was stated to be of 99.9999 percent purity. These values are so very much lower, that, if the purity is as stated either the thermal conductivity of cadmium in the region of the maximum and below is very strongly dependent on the crystal orientation, or the purer of these samples must be unannealed and in a highly strained condition; alternatively this sample is less pure than stated.The two curves published by Zavaritskii [7] relate mainly to the superconducting state, but do include a few values for the normal state. These are for two single crystals that appear to be of the same material but with the heat flow direction respectively perpendicular and parallel to the hexagonal axis. At the transition temperature (0.53 K given by Zavaritskii) these results indicate the thermal conductivity ratio k ± /k /7to be 1.31. Zavaritskii's paper contains a thermal conductivity value at this temperature for one other sample. This was also for the perpendicular...

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Section: Molybdenumsupporting

confidence: 56%

Section: Nickelmentioning

confidence: 81%