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Study of valence state of U ion in the quasi-two dimensional ternary uranium compounds

100%

Troć R.

Materials Science Poland

2006

tom Vol. 24, No. 3

585--589

The valence states and thermoelectric properties of two Ru-based uranium ternaries, namely U2Ru2Sn and U2RuGa8, have been studied. Intermediate-valence behaviour manifests themselves in broad peaks in the susceptibility, largely negative values of the paramagnetic Curie temperature and in the occurrence of maxima in the thermoelectric power. At the same time the specific heat data show no transition at low temperatures for both the compounds studied. The experimental results are fitted to the equations given in the literature relevant to a valence fluctuating state. The studied compounds are unique examples of such a state found for the first time among the huge family of known up to know uranium compounds usually being magnetically ordered at low temperatures.

Electronic band structure and X-ray photoemission studies of ternaries APdGe (A = Th,U) in the paramagnetic state

51%

Samsel-Czekała M. , Troć R. , Talik E.

Materials Science Poland

2007

tom Vol. 25, No. 2

301--304

Among uranium transition metal germanides, UPdGe reveals fascinating magnetic and electrical properties. We have recently performed electronic band-structure calculations of this compound and its non-5f electron counterpart ThPdGe in the paramagnetic state. The obtained theoretical electron densities of states (DOS) were compared with newly measured X-ray photoemission spectra (XPS). For UpdGe some disagreement was observed probably due to the predominant localized character of 5f electron states observed in the XPS spectra.

Photoemission spectra of some uranium compounds

45%

Szajek A. , Werwiński M. , Morkowski J. A. , Chełkowska G. , Troć R.

Materials Science Poland

2008

tom Vol. 26, No. 4

995--999

The electronic structure of some ternary uranium compounds (U2Ru2Sn and Ucu5M, M=Al, In, Sn) by theoretical (ab-initio calculations) and experimental investigations (X-ray photoemission) is studied. The band structure calculations have been performed based on the full-potential local-orbital (FPLO) method. The calculated densities of electronic states are used to obtain photoemission spectra, which are compared with experimental ones. Satisfactory agreement between the measured spectrum and that obtained from the calculated electronic structure has been achieved.

Magnetic properties of Dy5Pd2 single crystal

38%

Klimczak M. , Talik E. , Kusz J. , Hofmeister W. , Winiarski A. , Troć R.

Materials Science Poland

2007

tom Vol. 25, No. 2

263--267

Thermal variation of the lattice parameters, magnetic susceptibility and magnetization of a Dy5Pd2 single crystal has been measured. The single crystal obtained by the Czochralski method crystallized in the cubic Dy5Pd2 type structure. The compound exhibits two characteristic temperatures. The former equals about 40 K, and the latter about 20 K, being connected with the complex ordering of the rare earth sublattice and the reorientation process of the magnetic moments, respectively.