Structural study of the rare-earth transition-metal intermetallic compound Nd3N29Si4B10

摘要

The novel quaternary rare-earth transition-metal intermetallic compound Nd3Ni29Si4B10 of space group P4mm (No. 129) has been synthesised and its structure determined. The crystal structure has been investigated by scanning electron microscopy, X-ray and neutron powder diffraction measurements. Rietveld refinements of the powder X-ray and neutron diffraction patterns reveal a tetragonal structure of lattice parameters a=b=11.2327(7) Angstrom, c=7.8754(3) Angstrom with two formula units of Nd3Ni29Si4B10 per unit cell. The structure contains two rare-earth crystallographic sites of high symmetry, four B sites, seven transition metal sites and one Si site. The Ni atoms at the 2c 4 mm crystallographic site have a quasi-spherical polyhedral coordination. (C) 1998 Elsevier Science S.A. All rights reserved. [References: 23]