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Phase diagram of the Nd 2 Fe 14 B–Sm 2 Fe 14 B pseudo‐binary system
Author(s) -
Xu Ch. F.,
Chen K. H.,
Gu Z. F.,
Cheng L. Y.,
Ma D. D.,
Cheng G.,
Rao G. H.,
Yao Q. R.
Publication year - 2016
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576715022062
Subject(s) - solid solution , tetragonal crystal system , phase diagram , differential thermal analysis , analytical chemistry (journal) , crystallography , powder diffraction , rietveld refinement , crystal structure , materials science , phase (matter) , binary system , x ray crystallography , chemistry , diffraction , binary number , metallurgy , physics , arithmetic , mathematics , organic chemistry , chromatography , optics
The phase relations in the (1− x )Nd 2 Fe 14 B– x Sm 2 Fe 14 B system over the whole concentration range have been studied by means of X‐ray powder diffraction (XRD), differential thermal analysis (DTA) and scanning electron microscopy with energy‐dispersive X‐ray spectroscopy. Crystal structure parameters for all studied compositions of (Nd 1− x Sm x ) 2 Fe 14 B have been determined by full‐profile Rietveld refinements. These results revealed that all intermediate alloys of (Nd 1− x Sm x ) 2 Fe 14 B are similar to the end member of the investigated system, Nd 2 Fe 14 B, with a tetragonal structure (space group P 4 2 / mnm ). The formation of continuous solid solutions has been found in this system. The normalized lattice parameters and unit‐cell volumes of (Nd 1− x Sm x ) 2 Fe 14 B solid solutions decrease linearly with increasing Sm content. The DTA measurements show that the melting temperature of (Nd 1− x Sm x ) 2 Fe 14 B increases linearly with increasing Sm content and no metastable phases were detected. Based on the DTA data and XRD results, a tentative phase diagram for the pseudo‐binary system Nd 2 Fe 14 B–Sm 2 Fe 14 B has been constructed.