Preparation, crystal structure and magnetic properties of the uranium nickel phosphides UNi3P2, UNi4P2, U6Ni20P13 and U2Ni12P7

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作   者：

Ebel T.;  Jeitschko W.;  Albering JH.; 

作者机构：

Univ Munster;  D-48149 Munster;  Germany.;  artners.org;  Inst Anorgan Chem;  Wilhelm Klemm Str 8; 

关键词：

Metal;  Co;  Gd-lu;  34p6;  Equivalent-to-fe;  Neutron-diffraction;  Ternary pnictides;  Ni;  U3ni3;  Uranium nickel phosphides;  Magnetic properties;  Crystal structure;  Arsenides; 

期刊名称：

Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics

i s s n：

0925-8388

年卷期：

1998 年 266 卷 1/2 期

页   码：

71-76

页   码：

摘   要：

The compounds UNi3P2 and UNi4P2 were prepared for the first time and their structures were determined from X-ray powder data. UNi3P2 has a HoCo3P2 type structure with the orthorhombic lattice constants a=1047.5(2) pm, b=379.40(4) pm and c=1238.2(2) pm. UNi4P2 is isotypic with ZrFe4Si2. Its tetragonal structure was refined by the Rietveld method: P4(2)/mnm, a=707.67(1) pm, c=365.58(1) pm, R-F=0.013 for 78 structure factors and six positional and thermal parameters. The magnetic properties of these and the previously reported compounds U2Ni12P7 and U6Ni20P13 were investigated with a SQUID magnetometer. They show temperature-dependent paramagnetic behaviour with magnetic ordering temperatures all below 50 K. The nickel atoms do not seem to carry magnetic moments, while the moments of the uranium atoms vary between 1.6+/-0.1 and 2.1+/-0.1 mu(B) per uranium atom. The crystal structures of the title compounds are closely related. The compounds UNi2P2, U3Ni3.34P6 and UP2 belong to another structural family. The magnetic ordering temperatures of these compounds correlate with the uranium content. (C) 1998 Elsevier Science S.A.