Abstract
This paper presents details of Mg-assisted flux growth of Sm2Co17 single crystals in a Ta crucible well below the melting temperature of binary Sm2Co17. Both the crushed single crystalline powder x-ray diffraction (XRD) and single crystalline XRD data revealed the Th2Zn17 type rhombohedral(R-3m) crystal structure. Ta atom is found to be statistically replacing the Co-Co dumbbell with its position being at the center of the dumbbell. The Curie temperature of our lightly Mg and Ta doped Sm2Co17 sample is determined to be ∼1100 K using method of generalized Bloch law fitting of easy axis spontaneous magnetization data.
Highlights
Despite of the wide application of Sm2Co17 as a high performance magnet, its basic physical properties are not as extensively studied as other high flux commercial permanent magnets such as Nd2Fe14B, SmCo5, probably due to the lack of accessible single crystalline sample
The quality of Bridgman technique grown crystals strongly depend on the quality and type of the crystal growth crucibles and needs an excess amount of Sm
Sm9Co67Mg24 composition was loaded in a 3-capped Ta crucible7 and growth profile similar to Ce3−xMgxCo98 was used for the crystal growth
Summary
Despite of the wide application of Sm2Co17 as a high performance magnet, its basic physical properties are not as extensively studied as other high flux commercial permanent magnets such as Nd2Fe14B, SmCo5, probably due to the lack of accessible single crystalline sample. Various physical properties of single crystalline Nd2Fe14B sample are studied on self flux grown sample.. In case of SmCo5 and other high cobalt content binary R-Co compounds single crystals, the traditional self-flux growth technique out of binary melt is not readily accomplished. Most of the Sm-Co binary compounds are highly reactive with traditional ceramics crucibles and mostly peritectic with very high exposed liquidus temperature (>1300 ○C). Mg-flux to reduce the melting temperature and allow for the use of a sealed Ta crucible to hold the melt to get single crystals. This Mg assisted flux growth technique might open a route for the availability of most of R2T17 single crystals which are surprisingly rare so far e.g. Sm2Fe17.6
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