Quantitative X-ray powder Rietveld refinements for a series of alloys from the solid solution EuyFe4−xNixSb12, synthesized by argon arc-melting followed by long term annealing, established in all cases isotypism with the partially filled skutterudite-type structure, LaFe4P12. The Eucontent of the samples was determined from the combined data obtained results of Rietveld refinements and electron microprobe measurements. These investigations confirmed a systematic trend for the Eu-occupancy y in the parent lattice, revealing a gradual decrease of the maximum Eu-content from practically full occupancy, y = 0.83, in Eu0.83Fe4Sb12 to y ∼ 0.5 for Eu∼0.5Fe2Ni2Sb12. Eu0.83Fe4Sb12 orders magnetically below 84 K and the transition temperature decreases as a function of Fe/Ni substitution. As a further consequence of the Fe/Ni substitution electronic transport crosses over from a hole conductivity regime into electron dominated behaviour. Concomitantly, the transition metal exchange increases the Seebeck coefficient significantly, hence the figure of merit enhances.

No abstract

Дослідження структурних, енергетичних та кінетичних характеристик напівпровідників RNiSb (R = Gd, Lu)1 Львівський національний університет ім. І.Франка, вул.

Low-Temperature Magnetic and Electrical Transport Properties of Some TernaryCe-Rh-Si Compounds. -The new compounds CeRh1.82Si0.18, CeRh3Si0.125, Ce2Rh3.1Si0.9, Ce4Rh12Si, and Ce8Rh21.9Si3.1 are prepared by arc melting of the elements followed by annealing at 950°C for two weeks. As revealed by magnetic susceptibility and electrical conductivity measurements all the phases are Pauli paramagnets with metallic type electrical conductivity. -(KACZOROWSKI*, D.; LIPATOV, A.; GRIBANOV, A.; SEROPEGIN, Y.; J. Alloys Compd. 509 (2011) 23, 6518-6521, http://dx.