Journalartikel

Jahr der Veröffentlichung: 1993

Seiten: 77-87

Zeitschrift: Journal of Inorganic and General Chemistry

Bandnummer: 619

Heftnummer: 1

ISSN: 0044-2313

DOI Link: https://doi.org/10.1002/zaac.19936190113

Verlag: Wiley

Abstract: 

The new compounds Ln3UO6Cl3 (Ln = La, Pr, Nd) were prepared by heating stoichiometric amounts of LnOCl/Ln2O3/U3O8 (7: 1: 1) (Ln = La, Nd) and PrOCl/Pr6O11/U3O8 (12: 1:2) in silica ampoules (5 d, 1000-degrees-C, Ln = La; 9 d 800-degrees-C, Ln = Pr, Nd) in the presence of an excess of chlorine [p(Cl2, 25-degrees-C) = 1 atm]. Single crystals were obtained by chemical transport reactions using chlorine [p(Cl2, 25-degrees-C) = 1 atm] as transport agent [T2 = 1000-degrees-C --> T1 = 900-degrees-C (Ln = La); T2 = 840-degrees-C --> T1 = 780-degrees-C (Ln = Pr, Nd)].

Crystals of Ln3UO6Cl3 (Ln = La, Pr, Nd) were investigated by X-ray diffraction methods and La3UO5Cl3 additionally by high resolution electron microscopy.

The compounds Ln3UO6Cl3 crystallize in the hexagonal spacegroup P6(3)/M (No. 176) with Z = 2 formula units per unit cell. Isotypical structure refinements resulted n R = 3.04% respectively R(w) = 1.91% (Ln = La), R = 4.72% respectively R(w) = 3.80% (Ln = Pr) and R = 3.99% respectively R(w) = 2.49% (Ln = Nd). Uranium is coordinated with six oxygen atoms forming a trigonal prism. Lanthanide ions are 10-coordinated (6 oxygen atoms, 4 chlorine atoms).

Harvard-Zitierstil: HENCHE, G., FIEDLER, K. and GRUEHN, R. (1993) LN3UO6CL3 (LN = LA, PR, ND) - THE 1ST OXOCHLOROURANATES OF THE RARE-EARTHS, Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry, 619(1), pp. 77-87. https://doi.org/10.1002/zaac.19936190113

APA-Zitierstil: HENCHE, G., FIEDLER, K., & GRUEHN, R. (1993). LN3UO6CL3 (LN = LA, PR, ND) - THE 1ST OXOCHLOROURANATES OF THE RARE-EARTHS. Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry. 619(1), 77-87. https://doi.org/10.1002/zaac.19936190113