BCMaterials Fortnightly Seminar #68: Andrés Martín & Cristina Echevarría

BCMaterials Fortnightly Seminar #68: Andrés Martín & Cristina Echevarría



Nitrogenation of (ZrNd)Fe10Si2 alloys with ThMn12 structure

Tetragonal R(Fe,M)12 compounds (R = rare earth), with the ThMn12 structure, have gained again interest as permanent magnet materials with reduced R content, because of the critical supply of the raw rare-earth materials occurred in recent years. However, some stability issues have to be overcome first. Addition of Zr in substitution of Nd helps to stabilize the ThMn12 phase in the NdFe10Si2 alloy. While other stabilizing elements (Ti, V, Mo…) have a preference for the occupation of the 8i site in the structure, Si has a preference for the 8j and 8f sites, leaving the 8i site, which is the site with the largest moment for the ThMn12 structure, occupied by Fe, so the RFe10Si2 shows higher saturation magnetization and Curie temperature than other substituted analogue. It is known that nitrogenation of ThMn12 type of alloys, being N in the interstitial 2i sites of the structure) give rise to an enhancement of the Curie temperature and of the anisotropy field. Here we report for the first time the successful nitrogenation of a (ZrNd)Fe10Si2 alloy. The nitrogenation of a Si based alloy is a promising result for the development of bonded magnets due to the high saturation magnetisation of the parent alloy and the high Curie temperature and anisotropy field that can be reached after nitrogenation.




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Date(s) - 31/05/2017
12:00 PM - 1:30 PM

BCMaterials Office
Bizkaia Science and Technology Park
Building 500, 1st. Floor
48160 Derio

43.29637972841698, -2.866330048257396

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