THERMAL EXPANSION COEFFICIENTS OF GRAPHITE CRYSTALS. Page: 14 of 21
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It should be noted that a best-fit of equation 6b to only the data of
Bailey and Yates would yield a curve of ac versus temperature quite similar to the
"probable best curve" shown as. Figure 7 of Reference 24; it is apparent, however,
that such large values of ac could not be reconciled with the measured increase
of c-spacing with temperature.
Kelly and Walker(24) have also noted that their results would support a
ratio of s13/s33 = -0.066 as compared to the ratio - 0.075 obtained from the
review by Spence (21) or -0.012 from the review by Seldin(22); the results
reported herein yield a ratio s131s33 = B/M = -.0.0666.
The equations describing the lattice expansions and thermal expansion
coefficients, reported herein, are believed to be reasonable representations
of the behavior of crystallites in nuclear grade graphites over the temperature
range 3000 to 3000*K.
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Morgan, W.C. THERMAL EXPANSION COEFFICIENTS OF GRAPHITE CRYSTALS., report, October 31, 1971; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1033287/m1/14/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.