Synthesis, Crystal Chemistry, and Physical Properties of Ternary Intermetallic CompoundsAn2T2X(An=Pu, Am;X=ln, Sn;T=Co, Ir, Ni, Pd, Pt, Rh)
| Autor: | Jean Rebizant, Manuel Almeida, B. Kanellakopoulos, F. Wastin, Laura C. J. Pereira, J.M. Winand, J.C. Spirlet |
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| Rok vydání: | 1997 |
| Předmět: |
Chemistry
Crystal chemistry Intermetallic Actinide Crystal structure Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials Inorganic Chemistry Crystallography Tetragonal crystal system Transition metal Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Ternary operation Nuclear chemistry |
| Zdroj: | Journal of Solid State Chemistry. 134:138-147 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.1997.7563 |
| Popis: | The synthesis, structural, and physical characterization of nine new ternary intermetallic compounds belonging to the isostructuralAn2T2Xfamily with the transuranium Pu and Am elements, namely, Pu2Ni2In, Pu2Pd2In, Pu2Pt2In, Pu2Rh2In, Pu2Ni2Sn, Pu2Pd2Sn, Pu2Pt2Sn, Am2Ni2Sn, and Am2Pd2Sn, are reported. From these compounds only Pu2Rh2In, Am2Ni2Sn, and Am2Pd2Sn melt incongruently. All of these compounds crystallize in a tetragonal U3Si2-type structure, with the space groupP4/mbm, (Z=2) as most of the U and Np 2-2-1 compounds already found. In this structure,Anatoms occupy the 4h(x1,x1+0.5, 0.5),Tthe 4g(x2,x2+0.5, 0), andXthe 2a(0, 0, 0) positions. The average values ofx1andx2are, respectively, 0.17 and 0.37. Single-crystal X-ray data were refined toR/RW=0.045/0.066, 0.043/0.072, 0.066/0.080, 0.070/0.098, 0.029/0.048, 0.055/0.080, 0.073/0.096, 0.048/0.086, 0.048/0.065 for Pu2Ni2In, Pu2Pd2In, Pu2Pt2In, Pu2Rh2In, Pu2Ni2Sn, Pu2Pd2Sn, Pu2Pt2Sn, Am2Ni2Sn, and Am2Pd2Sn, respectively, for seven variables. The variation of the lattice parameters and the range of stability of the 2-2-1 phase are discussed in terms of the substitution of differentAn(actinide),T(transition metal), andX(p-electron) elements in their crystal structure. The possible role of spin fluctuations in the low-temperature behavior of the Pu samples is indicated by magnetic and electrical resistivity measurements. |
| Databáze: | OpenAIRE |
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