Uranium specific heat

UPt3 belongs to the class of uranium-based heavy-fermion compounds. That classification is due to the large value for y in the expression for the specific heat at low temperature ... 

The specific heat capacities of the metals nickel, zinc, rhodium, tungsten, gold, and uranium at 25°C are 0.444, 0.388, 0.243, 0.132, 0.129, and 0.116 J K g respectively. Calculate the molar heat capacities of these six metals. Note how closely the molar heat capacities for these metals, which were selected at random, cluster about a value of 25 J K mol b The rule of Dulong and Petit states that the molar heat capacities of the metallic elements are approximately 25 J K moUb... 

A cubic piece of uranium metal (specific heat capacity = 0.117 J/°C g) at 200.0°C is dropped into 1.00 L deuterium oxide ("heavy water," specific heat capacity = 4.211 J/°C g) at 25.5X. The finai temperature of the uranium and deuterium oxide mixture is 28.5°C. Given the densities of uranium (19.05 g/cm ) and deuterium oxide (1.11 g/mL), what is the edge iength of the cube of uranium ... 

In most cases the low-temperature specific heat (at temperatures much lower than the Debye temperature) can be described by Cp = yT+ T, where yT is the so-called linear term due to the excitations of the conduction electrons, and is the low-temperature approximation of the specific heat of the lattice. For normal conductors, y is of the order of l-10mJ/(molK ), while heavy fermions show y-values up to 1000mJ/(molK ). Details about cerium- and uranium-based heavy-fermion materials have been reviewed by Grewe and Steglich (1991), Sereni (1991), Loewenhaupt and Fischer (1993), Fournier and Gratz (1993), Wachter (1994), Nieuwenhuys (1995), Onuki and Hasegawa (1995) and Arko et al. (1999). 

Several uranium compounds with Sommerfeld coefficients in the range y = 90-150mJ/ mol have had both thermal expansion and specific heat measured. Results for UAI2 are shown in fig. 31. The Gruneisen parameter increases with temperature in a similar way as in UPt3, except that the limiting value at T = 0 (f3= 18) is smaller. Indeed, this value is comparable to the value of Q in mixed-valent compounds with similar values of y. At higher temperatures approaches values characteristic of phonons. 

Specific-Heat Constants for the Oxides of Uranium and Thorium [61]... 

Studies done in 1880 showed that a chloride of uranium had 37.34% Cl by mass and an approximate formula mass of 382 u. Other data indicated the specific heat of uranium to be 0.0276 cal g Are these data in agreement with the atomic mass of uranium assigned by Mendeleev, 240 u [Hint Refer to Feature Problem 124 of Chapter 7.]... 

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