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Poster De Conférence Année : 2017

Boron Characterization in Intermetallic Bulk or Thin Film Alloys using Scanning Electron Microscopy and Electron Probe Microanalysis

Nora Dempsey
Sophie Rivoirard
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Olivier Isnard
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Résumé

Hard magnetic materials are of big interest as permanent magnets either as bulk or thin films. Magnetic bulks take place in wind turbines (more than 1.7t for a 3MW turbine) or in Hybrid Electric Vehicle (1.25 kg by unit). Magnetic thin films have many potential applications in micro-systems and they are studied as model systems to understand the physics of magnetization reversal. Properties of both types depend on the microstructure of the alloys or of the layer for thin film: chemical composition, grains size and orientation… Several compounds RE-M-B (RE = Gd, Nd, Sm, Yb ; M = Co, Fe) and compositions are explored. [1][2] Boron – and more generally light elements – analysis is very difficult to be accurate. Several physical phenomena and technological aspects complicate the task for boron: very low ionization efficiency (less than 0,2%), high M.A.C. are around 31000cm2/g in Co & Fe and 17000cm2/g and 27000cm2/g in rare-earth Nd & Sm respectably, shape and position of the boron peak in WDS due to the atom environment and the need to filter at the 4th order the metal L-line, the weak efficiency of detectors and high matrix correction “ZAF” coefficients. [3] Boron content was determined by EPMA (LDE3H-Mo/B4C), Nd, Sm, Fe and Co with EDX and PETH or LiFH crystals using several ways. In all compounds, the boron weight percent is less than 7% and eight phases coexist in this short composition range for RE-Co-B alloys. The microstructure was observed using various microscopy techniques: FEG-Scanning Electron Microscope ZEISS-Ultra+ with EDX-Bruker (SDD) and EBSD-Oxford, a W-SEM JEOL 840A with Si(Li) detector and an EPMA JEOL 8800 (5 spectrometers with two crystals on each). [ 1] Chen Y Liang J, Chen X L Liu Q 2000 Journal of Alloys and Compounds 296 L1–L3 [ 2] Chen Y Liang J, Chen X L Huang F 1999 Journal of Alloys and Compounds 288 170-172 [ 3]Bastin G F and Heijligers H J M 2014 Quantitative electron probe microanalysis of boron, carbon, nitrogen and oxygen”. (ISBN 978-94-6228-222-3)
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Dates et versions

hal-03546001 , version 1 (27-01-2022)

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  • HAL Id : hal-03546001 , version 1

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Sébastien Pairis, Nora Dempsey, Sophie Rivoirard, Olivier Isnard. Boron Characterization in Intermetallic Bulk or Thin Film Alloys using Scanning Electron Microscopy and Electron Probe Microanalysis. EMAS 2017 - 15th European Workshop on modern developments and applications in microbeam analysis and IUMAS-7 Meeting, May 2017, Konstanz, Germany. , 2017. ⟨hal-03546001⟩

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