Neutron diffraction analysis of Nd3Fe29−xTx(T=Ti, Cr, Mn)

Autor:	W. B. Yelon, Z. Hu
Rok vydání:	1996
Předmět:	Steric effects Crystallography Materials science Magnetic moment Rietveld refinement Atom Neutron diffraction Metallurgy General Physics and Astronomy Titanium alloy Curie temperature Space group
Zdroj:	Journal of Applied Physics. 79:1330-1336
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.361030
Popis:	Rietveld analysis of neutron‐diffraction data from Nd3Fe29−xTx (T=Ti, Cr, and Mn) has been used to determine the location of the substitutional atoms and the magnetic moments. Reanalysis of the T=Ti data confirms that the space group A2/m is a better choice than P21/c, which had previously been used to describe the structure. The Ti atom locations and concentrations remain unaffected in the two space groups, but for the other substituents the refined concentrations are well behaved in A2/m, whereas in P21/c the refinements were unstable due to the symmetry relations between certain substituted sites. The site occupancies are analyzed in terms of steric and environment effects. A possible explanation for the high Curie temperature of the Cr compound is proposed.
Databáze:	OpenAIRE
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