Specific heat measurements of TiB2 and 6LiF from 0.5 to 30K

Abstract

The specific heats of TiB 2 and 6 LiF have been measured from 0.5 to 30 K as part of a larger project in the construction of a neutron spectrometer. For this application, the measured specific heats were used to extrapolate the specific heats down to 0.1 K with lattice, electronic, and Schottky equations for the respective samples. The resultant specific heat values at 0.1 K for TiB 2 and 6 LiF are 4.08 · 10 À4 ± 0.27 · 10 À4 J/K/mol and 9.19 · 10 À9 ± 0.15 · 10 À9 J/K/mol, respectively.

Neutron absorption spectroscopy for identification of light elements in actinides

“…The thermal coupling 1=G abs ¼ 1=G K þ 1=G v between the absorber and the Si chip is due to the Kapitza thermal contact resistance G K ¼ 1:6 Â 10 À3 T 3 A assuming a contact area A ¼ 4 mm 2 , plus the thermal conductivity of the varnish G v ¼ 105 mW=K [15]. The heat capacities C LiF ¼ 0:19 nJ=K and C SiþTES ¼ 11 pJ=K at T c ¼ 155 mK are calculated from the Debye law [16]. The theoretical rise time is t r ¼ 28 ms, a factor of 5 less than the smallest experimental value in Fig.…”

Elastic and thermodynamic properties of fcc-6Li2O under high temperatures and pressures

“…3 H + 4 a + D) [2], resulting in an obvious temperature and pressure rise which will cause crystal lattice damage. Demontis et al [3,4] have predicted that a further transformation to an antifluorite phase in ice at some pressure above 150 GPa, and experiments show changes in vibrational mode coupling [5] and single-crystal X-ray diffraction peak intensity [6] near 150 GPa.…”

Φασματοσκοπικές Μελέτες Πυρηνικού Μαγνητικού Συντονισμού (NMR) Σε Συστήματα Περοβσκιτών Μαγγανίου Κολοσσιαίας Μαγνητοαντίστασης

“…Οη ππξεληθέο καγλεηηθέο ξνπέο κπνξνύλ λα ζεσξεζνύλ γεληθά σο ζπζηήκαηα ζηα νπνία ε ελέξγεηα θαζνξίδεηαη από ηελ θαηάιεςε δύν επηπέδσλ. H ππέξιεπηε ζπλεηζθνξά ζηελ εηδηθή ζεξκόηεηα ππνινγίδεηαη κε ηε ρξήζε ζπλαξηήζεσλ Schottky [456,457].…”