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	STUDIA PHYSICA - Ediţia nr.1-2 din 2021

	Articol:	COMBINED MÖSSBAUER SPECTROMETRY AND ATOM PROBE TOMOGRAPHY INVESTIGATION OF MECHANICALLY MILLED RARE EARTH / TRANSITION METAL POWDERS. Autori: JEAN-MARIE LE BRETON, RODRIGUE LARDE, AMJAAD ABOU LATIF, NICOLAS MAAT, VIRGINIE NACHBAUR, OLIVIER ISNARD, DOMINIQUE GIVORD, IONEL CHICINAȘ, VIOREL POP.


	Rezumat: DOI: 10.24193/subbphys.2021.06 Published Online: 2021-12-30 Published Print: 2021-12-30 pp. 55-68 VIEW PDF FULL PDF The microstructure of mechanically milled Nd₂Fe₁₄B, SmCo₅/Fe and SmCo₃Cu₂/α-Fe alloys has been investigated by Mössbauer spectrometry and atom probe tomography. The structural changes that occur upon milling and subsequent annealing were characterised at a nanometer scale. Milling promotes intermixing of the elements and the formation of nanograins. In Nd-Fe-B powders, the Nd₂Fe₁₄B phase is transformed into α-Fe and an amorphous Nd-Fe-B phase. In SmCo₅/Fe powders, Fe/Co intermixing occurs, leading to the formation of Sm(Co,Fe)₅ and α-Fe(Co) phases. In SmCo₃Cu₂/Fe powders, although Sm is partly oxidised, Fe/Co intermixing occurs as well, leading to the formation of α-Fe(Co) nanograins surrounded by Sm(Co,Cu,Fe)₅ intergranular regions. The combined Mössbauer and atom probe tomography investigation of rare earth / transition metal powders thus allows revealing the effect of mechanical milling and subsequent annealing on the nanostructure of the powders. These results are helpful for the understanding of the magnetic properties of the powders. Keywords: rare earths-transition metals powders, Mössbauer spectrometry, atom probe tomography




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