The Crystal Structure of Ni10Sn5P3
2002; Elsevier BV; Volume: 166; Issue: 2 Linguagem: Inglês
10.1006/jssc.2002.9605
ISSN1095-726X
AutoresF.R. García–García, А.-К. Ларссон, Sigrid Furuseth,
Tópico(s)Iron-based superconductors research
ResumoSelected-area electron diffraction revealed that Ni10Sn5P3 forms a superstructure of the NiAs-type structure. All observed reflections could be fully indexed as H=G+mq, where G represents the reflections of the underlying hexagonal B8-type average structure, m is an integer and q=18[3122]*. The resulting space group is P1 (Z=2). The crystal structure was refined using single-crystal X-ray diffraction methods on a twinned specimen (1651 observed unique reflection, Rw obs=0.0391). The superstructure reflections are caused by ordering of Sn and P atoms on the hcp array coupled to Ni ordering in 14 of the trigonal bipyramidal sites. The unit-cell parameters refined from powder X-ray diffraction data are a=6.419(2) Å, b=8.322(3) Å, c=10.278(3) Å, α=73.32(4)°, β=84.41(3)°, γ=82.71(2)°, V=520.60(5) Å3. High-resolution electron microscopy images revealed a well-ordered material although macroscopic crystals are twinned.
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