Specific Heat of LiF and KI at Low Temperatures

William W. Scales

doi:10.1103/PhysRev.112.49

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Specific Heat of LiF and KI at Low Temperatures

William W. Scales^*

The Rice Institute, Houston, Texas

^*Shell Oil Company Fellow in Physics.

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Phys. Rev. 112, 49 – Published 1 October, 1958

DOI: https://doi.org/10.1103/PhysRev.112.49

Abstract

The heat capacities of LiF and KI single crystals have been measured over the temperature range 2-7°K. An adiabatic calorimeter was employed making use of a mechanical contact "heat switch." A carbon resistor embedded directly in the specimen was used as thermometer. For LiF the heat capacity was found to be proportional to the cube of the temperature over the whole range of temperatures investigated, and the value of $θ_{0}$ was found to be 722°K. For KI variations from the $T^{3}$ dependence were found above 3°K. An extrapolation of a smooth curve through the data to zero degrees temperature indicates a value of $θ_{0} = 128 °$ K. These values of $θ_{0}$ are compared to values of $θ_{0}$ derived from elastic constants data.

References (16)

C. V. Briscoe and C. F. Squire, Phys. Rev. 88, 398 (1957)
M. H. Norwood and C. V. Briscoe, preceding paper [Phys. Rev. 112, 45 (1958)]
P. Debye, Ann. Physik 39, 789 (1912)
M. Born and T. von Kármán, Physik. Z. 13, 297 (1912)
M. Blackman, Reports on Progress in Physics (The Physical Society, London, 1941), Vol. 8, p. 11
K. Clusius and W. Eichenauer, Z. Naturwiss. 11A, 715 (1956)
W. T. Berg and J. A. Morrison, Proc. Roy. Soc. (London) A242, 467 (1957)
K. G. Ramanathan and T. M. Srinivasan, Phil. Mag. 46, 338 (1955)
J. R. Clement and E. H. Quinnell, Rev. Sci. Instr. 23, 213 (1952)
N. Pearlman and P. H. Keesom, Phys. Rev. 88, 398 (1952)
D. L. Martin, Phil. Mag. 46, 751 (1955)
J. DeLaunay, in Solid State Physics, edited by F. Seitz and D. Turnbull (Academic Press, Inc., New York, 1956), Vol. 2
W. V. Houston, Revs. Modern Phys. 20, 161 (1948)
Betts, Bhatia, and Wyman, Phys. Rev. 104, 37 (1957)
W. Ludwig, J. Phys. Chem. Solids 4, 283 (1958)
T. H. K. Barron and J. A. Morrison, Can. J. Phys. 35, 799 (1957)

[c1] C. V. Briscoe and C. F. Squire, Phys. Rev. 88, 398 (1957)

[c2] M. H. Norwood and C. V. Briscoe, preceding paper [Phys. Rev. 112, 45 (1958)]

[c3] P. Debye, Ann. Physik 39, 789 (1912)

[c4] M. Born and T. von Kármán, Physik. Z. 13, 297 (1912)

[c5] M. Blackman, Reports on Progress in Physics (The Physical Society, London, 1941), Vol. 8, p. 11

[c6] K. Clusius and W. Eichenauer, Z. Naturwiss. 11A, 715 (1956)

[c7] W. T. Berg and J. A. Morrison, Proc. Roy. Soc. (London) A242, 467 (1957)

[c8] K. G. Ramanathan and T. M. Srinivasan, Phil. Mag. 46, 338 (1955)

[c9] J. R. Clement and E. H. Quinnell, Rev. Sci. Instr. 23, 213 (1952)

[c10] N. Pearlman and P. H. Keesom, Phys. Rev. 88, 398 (1952)

[c11] D. L. Martin, Phil. Mag. 46, 751 (1955)

[c12] J. DeLaunay, in Solid State Physics, edited by F. Seitz and D. Turnbull (Academic Press, Inc., New York, 1956), Vol. 2

[c13] W. V. Houston, Revs. Modern Phys. 20, 161 (1948)

[c14] Betts, Bhatia, and Wyman, Phys. Rev. 104, 37 (1957)

[c15] W. Ludwig, J. Phys. Chem. Solids 4, 283 (1958)

[c16] T. H. K. Barron and J. A. Morrison, Can. J. Phys. 35, 799 (1957)

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Specific Heat of LiF and KI at Low Temperatures

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