Lattice Heat Capacity of the Rare Earths. Heat Capacities of Yttrium and Lutetium from 15–350°K

Abstract

The linewidth parameter IJ.p/p for nonresonant microwave absorption in CRaCI and in CHCbF has been determined at five temperatures between 10° and 150°C from cavity measurements of dielectric dispersion in the gases as a function of pressure at a frequency of 402 Mc. The linewidth is found to be proportional to T-l.5, as opposed to the T-1.0 dependence predicted by Anderson's theory of collision broadening.

Persistent nonequilibrium dynamics of the thermal energies in the spin and phonon systems of an antiferromagnet

“…1). We determined the combined electron and phonon contribution from the specific heat of the non-magnetic rare earth lutetium, 35 which is in agreement with a simple Debye approximation. Near its maximum at T N the spins carry more than half of the specific heat, whereas the specific heat of the electrons is negligible in the relevant temperature range.…”

THE SPECIFIC HEAT OF DYSPROSIUM METAL BETWEEN 0.4 AND 4 K (thesis)

“…(26) It seenas, therefore, that Cg is similar for all these rare earths. However, recent naeasurements by Dreyfus, Goodman, Lacaze, and Trollietl^?)…”

Lattice Specific Heats of Thallium and Yttrium

“…The experimental specific heat data for yttrium have been taken from the work of Jennings et al [6]. These workers also have given only the C, values and have not converted them to C,.…”

“…Yttrium is transitional also and has the electronic configuration 4d 5sa. Clusius and Vaughen [l], Keesom and Kok [2], Hicks [3], Snider and Nicol [4], and Van Der Hoeven and Keesom [5] determined the heat capacities of thallium, and Jennings et al [ 6 ] , Montgomery and Pells [7], and Morin and Maita [8] those of yttrium in various temperature regions. No attempt has, however, been made so far t o discuss the available experimental data for them theoretically.…”