Binary Actinide Oxides by R. Troc, D. Kaczorowski (auth.), H.P.J. Wijn (eds.)

By R. Troc, D. Kaczorowski (auth.), H.P.J. Wijn (eds.)

In subvolume III/27C2 magnetic and similar houses of binary actinide oxides were compiled. This subvolume covers info bought in view that 1980 and will consequently be considered as complement to quantity III/12c. half 27C1 offers with binary oxides of the lanthanide parts. Magnetic homes of the binary oxides of 3d transition parts are given in subvolume 27 G.

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C. c. Crystal structure by neutron diffraction at 400 K (space group I43d ) Lattice parameter vs. temperature Lattice parameter vs. 1000 °C Specific magnetic susceptibility: χg vs. 6…24 K divided by T vs. T2 Heat capacity at 300…520 K: λ-anomaly at 330 K due to some rearrangement of oxygen atoms, below 300 K Heat capacity at 5…310 K (calculated thermodynamic functions) Magnetic entropy vs. T [Ref. p. , Tables Ref. 5 K for α-form Heat capacity divided by T vs T2 Table1 268 62WG 269 68FOW La n d o l t - B ö r n s t e i n New Series III/27C2 Ref.

Note that both the relative energies and weight of the structures in the calculated spectra agree well with experiment. It is argued in [88GSHS] that the main peak and the 7 eV satellite (marked here by the arrows) in the 4f core level spectra are mixtures of 5f2 and 5f3 configurations with bonding and antibonding character, respectively, and the large separation of this satellite from the main peak is due to strong hybridisation of the O 2p electron states with the actinide 5f states. The increasing weight of the satellite on going from ThO2 through UO2 to NpO2 is due to lowering of the 5f level energy.

2). The results for ThO2, UO2 and NpO2 are similar to that derived for these compounds in [88GSHS] (see Fig. 6). f b Intensity I 10 eV [Ref. p. 213 h → Fig. 8. AnO2. Comparison of the experimental XPS spectra taken from [77VLDH] (upper panels) with such spectra calculated using molecular cluster method in local density formalism (lower panels) for: (a) An = U, Np and Pu, (b) An = Am, Cm and Bk [79GRE1]. 9 eV, respectively. Note a good agreement between the theoretical and experimental results (for a detailed comparison see the paper).

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