G K White et al 1990 J. Phys.: Condens. Matter 2 7715 doi:10.1088/0953-8984/2/37/015
G K White, S J Collocott and J G Collins
Show affiliationsMeasurements of the heat capacity, Cp, from 0.6 to 15 K can be represented by Cp=(0.32+or-0.02)T3 mJ mol-1 K-s ( theta D0=265+or-10 K) below 10 K. Linear thermal expansivities parallel ( alpha /sub ///) and perpendicular ( alpha perpendicular to ) to the symmetry axis from 2 to 120 K show marked anisotropy; alpha perpendicular to is negative below 10 K (while alpha /sub /// remains positive) but becomes positive and much larger than alpha /sub /// above 50 K. The Gruneisen parameter, gamma , increases from approximately=1 at 3 K to +1.4 at 30 K and is approximately=0.9 room temperature.
65.40.De Thermal expansion; thermomechanical effects
63.70.+h Statistical mechanics of lattice vibrations and displacive phase transitions
81.40.Jj Elasticity and anelasticity, stress-strain relations
Issue 37 (17 September 1990)
G K White et al 1990 J. Phys.: Condens. Matter 2 7715
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