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Synthesis, crystal structure, magnetism, and absorption spectra of A2UX5 type halides (A*K, Rb* X*CL, Br, I).
Autorzy
Rok wydania
1994
Czasopismo
Zeitschrift für Anorganische und Allgemeine Chemie
Numer woluminu
620
Strony
1339-1345
DOI
10.1002/zaac.19946200802
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The ternary uranium(III) halides A2UX5 (A = K, Rb; X = Cl, Br, I) have been prepared from the binary components AX and UX3 in sealed tantalum containers. According to their Guinier X-ray powder patterns, they all crystallize with the K2PrCl5/Y2HfS5 type of structure. Lattice constants for ambient temperature are reported. Single-crystal structure refinemens were undertaken for K2UI5 and Rb2UCl5. Magnetic susceptibility data were recorded with a SQUID magnetometer from liquid helium to room temperature. One-dimensional (intrachain) and three-dimensional antiferromagnetic ordering occur at low temperatures dependent upon the U3+U3+ distance. Absorption spectra were recorded between 4 000 and 28 000 cm−1. They show f—f transitions typical for U3+ and, depending on the halide, very strong f—d transitions above 14 000 to 15 000 cm−1, respectively.
Adres publiczny
https://doi.org/10.1002/zaac.19946200802
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