THERMAL EXPANSION COEFFICIENTS OF GRAPHITE CRYSTALS. Page: 11 of 21
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N = 0.7187 x 10-8 deg-2
c = 6.6818 A
Figure 3 shows the fit of the c-spacings, calculated from equation 8b, to
the measured values and Figure 4 compares the smoothed ac data with the results
calculated by use of equation 6b and the coefficients listed above. The recent
direct measurements of ac, reported by Bailey and Yates(16), are included on
Figure 4. Two points are especially worth noting in regard to Figure 4: (1) al-
though the "best. curve" intersects the measurements of Bailey and Yates at about
300*K, it falls below their data at all lower temperatures; and (2) whereas the.
data of Nelson and Riley show a plateau in the curve of ac versus temperature, the
present results indicate an actual reduction in ac over the temperature range
5000 to 800*K. The length change data reported by Entwisle(20) tend to support
this behavior; however, the variation of ac in this temperature range needs
Riley's theoretical curve of ac versus temperature lies slightly lower
than the present results up to 12000 and, of course,.follows the data of Nelson
Jnd Riley more closely than do Lhese results; at temperatures above 1200*K,
however, it increases much too rapidly, reaching a value of 48 x 10-6 deg~1 at
Elastic Moduli and Compressibilities
Riley has shown that the lattice elastic moduli can be calculated by
combining equations 7 with the equations for the volumetric (K) and linear
compressibilities (Ka and KC), parallel and transverse to Lhie crystal basal
Ka = s1 + s12 + s13 (lla)
Kr = 2s13 + s33 (11 b)
K 2Ka+Kc= 2(s11 + s12) + 413 +s33 (llc)
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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/m1/11/: accessed May 27, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.