Abstract
Interaction between the components in the Ho-Fe-Sn ternary system was studied using X-ray diffractometry, metallography and electron microprobe analysis. Isothermal section of the phase diagram was constructed at 670 K over the whole concentration range. Component interaction in the Ho-Fe-Sn system at 670 K results in the existence of one ternary compound HoFe6Sn6 which crystallizes in the YCo6Ge6 structure type (space group P6/mmm, a=0.53797(2), c= 0.44446(2) nm). The interstitial-type solid solution HoFexSn2 (up to 8 at.% Fe) based on the HoSn2 (ZrSi2-type structure) binary compound was found. Solubility of Sn in the HoFe2 binary (MgCu2 structure type) extends up to 5 at. %.
Highlights
Intermetallic phases containing rare earths (R), iron and p-elements display interesting physical properties
The binary boundary Ho-FeSn2 HoFexSn2 HoFe6Sn6 (Fe), Ho-Sn and Fe-Sn systems, which delimit Ho-Fe-Sn system, have been investigated earlier, their phase diagrams and crystallographic characteristics of the binary compounds are reported in the literature [14, 17,18,19]
In the Fe-Sn system we confirmed the existence of the FeSn (CoSntype) and FeSn2 (CuAl2-type) binaries at 670 K in agreement with Refs. [17, 18], other two phases Fe3Sn and Fe3Sn2 formed above 870 K were not observed at investigated temperature
Summary
Intermetallic phases containing rare earths (R), iron and p-elements display interesting physical properties. The physical (magnetic, electric, mechanic) properties of the intermetallics in many cases are strongly dependent on the synthesis, microstructure of the alloys, heat treatments, the stability, homogeneity domains, and structural disordering of the intermediate phases. In this context the investigation of the R–Fe–Sn ternary systems at selected temperatures is very important, in order to provide valuable information of the sample preparation method, stability, composition and crystal structure peculiarity of the ternary compounds. The subject of the present paper consists of the complete investigation of the Ho-Fe-Sn phase equilibrium diagram at 670 K by X-ray powder diffraction and electron microprobe analysis (EPMA)
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