a Department of Physics, yantai University, Yantai 264005 , China; b Institute of Physics, Academia Sinica, Beijing 100080, China; c Chinese Institute of Atomic Energy, Beijing 102413 , China
Abstract The crystal and magnetic structures of Nd2Fe14Si3 at room temperature were refined by Rietveld analysis of neutron-powder-diffraction data. It was found that silicon atoms occupy preferentially both 18h and 18f of Th2Zn17-type structure with occupancies 0.36 and 0.14, respectively, The Fe-Fe bond-lengths computed with the refined crystallographic parameters have optimum values, as compared with those of Nd2Fe17 compounds, which can explain well why the Curie temperature rises strongly when the unit cell volume reduces with the substitution of silicon for iron in Nd2Fe17.
Received: 02 March 1995
Accepted manuscript online:
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