Thermodynamic functions of Americium metal

Nature of the5fstates in actinide metals

“…However, intermediate coupling of the 5f states in Am is very close to the jj limit, meaning only a small electron occupation is observed in the j = 7/2 level. The EELS and spinorbit results by Moore et al (2007a; also clearly indicate a 5f 6 configuration, which is in turn supported by PE results (Naegele et al, 1984;Cox et al, 1992;Gouder et al, 2005), transport measurements (Müller et al, 1978), thermodynamic measurements (Hall et al, 1980), DFT (Söderlind and Landa, 2005), and DMFT (Shim et al, 2007).…”

Electron heat capacity and lattice properties of Americium

“…It is important to note that the values obtained for the Debye temperature (see the inset to Fig. 2) are higher than the values obtained in [3], which vary from 100 to 130 K. This is due to the fact that the low tem perature electron heat capacity was not taken into account correctly in [3], which resulted in exaggerated values of the lattice contribution and, hence, of the Debye temperature.…”

“…In Fig. 2, the results of calcu lation of the total specific heat capacity of americium are compared with the available experimental data [3]; it can be seen that the experimental data can be described quite exactly using the model under investi gation. It is important to note that the values obtained for the Debye temperature (see the inset to Fig.…”

“…Information on the lattice properties of americium is scarce and contradictory [3][4][5][6][7]. Experimental data on the thermal expansion coefficient and the bulk modulus are limited in temperature and are available only for the 243 Am.…”

Americium

“…These latter investigators observed binding in americium metal to be reduced compared to that in lighter actinide metals and attributed this result to the importance of 5f electrons in electrical conduction. In a later paper, Hall et al (1980) used their data to generate 'best values' for the heat capacity, crystal entropy, and electrical resistivity of americium metal; these 'best values' are shown in Table 8.3.…”