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Title: Thermal Diffusivity and Conductivity Measurements in Diamond Anvil Cells

Abstract

We have undertaken a study of the feasibility of an innovative method for the determination of thermal properties of materials at extreme conditions. Our approach is essentiality an extension of the flash method to the geometry of the diamond-anvil cell and our ultimate goal is to greatly enlarge the pressure and temperature range over which thermal properties can be investigated. More specifically, we have performed test experiments to establish a technique for probing thermal diffusivity on samples of dimensions compatible with the physical constraints of the diamond anvil cell.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
902295
Report Number(s):
UCRL-TR-228329
TRN: US200717%%524
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIAMONDS; DIMENSIONS; GEOMETRY; THERMAL DIFFUSIVITY; THERMODYNAMIC PROPERTIES

Citation Formats

Antonangeli, D, and Farber, D L. Thermal Diffusivity and Conductivity Measurements in Diamond Anvil Cells. United States: N. p., 2007. Web. doi:10.2172/902295.
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Antonangeli, D, & Farber, D L. Thermal Diffusivity and Conductivity Measurements in Diamond Anvil Cells. United States. doi:10.2172/902295.
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Antonangeli, D, and Farber, D L. Thu . "Thermal Diffusivity and Conductivity Measurements in Diamond Anvil Cells". United States. doi:10.2172/902295. https://www.osti.gov/servlets/purl/902295.
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@article{osti_902295,
title = {Thermal Diffusivity and Conductivity Measurements in Diamond Anvil Cells},
author = {Antonangeli, D and Farber, D L},
abstractNote = {We have undertaken a study of the feasibility of an innovative method for the determination of thermal properties of materials at extreme conditions. Our approach is essentiality an extension of the flash method to the geometry of the diamond-anvil cell and our ultimate goal is to greatly enlarge the pressure and temperature range over which thermal properties can be investigated. More specifically, we have performed test experiments to establish a technique for probing thermal diffusivity on samples of dimensions compatible with the physical constraints of the diamond anvil cell.},
doi = {10.2172/902295},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 22 00:00:00 EST 2007},
month = {Thu Feb 22 00:00:00 EST 2007}
}
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Technical Report:
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DOI:  10.2172/902295
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  • The measurement of the thermal conductivity of small samples over an extended temperature range is discussed. Experimental data on thermal diffusivity obtained by the laser pulse technique are combined with specific heat data, obtained either by differential scanning calorimetry or by vaporization calorimetry, to derive the thermal conductivity. As an example of the use of this technique, data are reported on the conductivity of an ASTM A517 steel over the temperature range 100 to 1200/sup 0/C. The thermal diffusivity was derived from measured temperature vs time data obtained from a laser pulse diffusivity system designed and constructed at Sandia. Amore » data reduction technique was used which simultaneously corrects for finite pulse time effects and sample heat losses by radiation. The specific heat was measured directly at temperatures below 680/sup 0/C using a commercial differential scanning calorimeter. For temperatures up to 1200/sup 0/C, the specific heat was determined by differentiating a curve fit to the measured sample enthalpy. The enthalpy was measured using a liquid argon vaporization calorimeter developed at Sandia. The thermal conductivity of the A517 steel was then calculated over the entire temperature range. A classical Curie transition was observed during measurements of both the diffusivity and enthalpy. The effect of this transition on the measured thermal conductivity is discussed.« less

  • - International Journal of Thermophysics
    The thermal conductivity {kappa} of natural, gem-quality diamond, which can be as high as 2500 Wm{sup {minus}1} K{sup {minus}1} at 25 C, is the highest of any known material. Synthetic diamond grown by chemical vapor deposition (CVD) of films up to 1 mm thick exhibits generally lower values of {kappa}, but under optimal growth conditions it can rival gem-quality diamond with values up to 2200 Wm{sup {minus}1} K{sup {minus}1}. However, it is polycrystalline and exhibits a columnar microstructure. Measurements on free-standing CVD diamond, with a thickness in the range 25--400 {micro}m, reveal a strong gradient in thermal conductivity as amore » function of position z from the substrate surface as well as a pronounced anisotropy with respect to z. The temperature dependence of {kappa} in the range 4 to 400 K has been analyzed to determine the types and numbers of phonon scattering centers as a function of z. The defect structure, and therefore the thermal conductivity, are both correlated with the microstructure. Because of the high conductivity of diamond, these samples are thermally thin. For example, laser flash data for a 25-{micro}m-thick diamond sample is expected to b virtually the same as laser flash data for a 1-{micro}m-thick fused silica sample. Several of the techniques described here for diamond are therefore applicable to much thinner samples of more ordinary material.« less

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    The thermal diffusivity was measured using the laser flash method on sintered uranium dioxide (O/U=2.003, density=10.48X10 kg/m, from 300 to 2773 K), and urania and gadolinia mixed fuel (2,4 and 6 Wt% Gd2O3 content, from 600 to 1850 K). An equation was suggested for near-stoichiometric uranium dioxide over the temperature range 500-3100 K: K=(1-aP)(1/(A+BT)+DTxexp(-E/kT)x(1+H(E/kT+2)(sup 2))), where K in W/(m)(K), P is the fraction of porosity, a=2.74-5.8X10(sup 4-)T, A=3.68X10(sup 2-)(m)(K)/W, B=2.25X10(sup 4-)m/W, D=5.31X10(sup 3-)W/mXK2, H=0.264, E=1.15 ev, k is the Boltzmann constant. The thermal conductivity of UO2-Gd2O3 samples as a function of temperature and Gd2O3 content, X, could be expressed bymore » phonon conduction; K=1/(A+BT) in the temperature range from 600 to 1700 K, where A=2.50 X+0.044(m)(K)/W.« less

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