Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Structural, Magnetic, and Mechanical Properties of Nd16(Fe76-xCox)B8 0 ≤ x ≤ 25 Alloys

Juan Sebastián Trujillo Hernández
* ORCID logo ,
Ahmed Talaat
ORCID logo ,
Jesus A. Tabares
,
Dagoberto Oyola Lozano
,
Humberto Bustos Rodriguez
,
Hugo Martinez Sanchez
,
German A. Pérez Alcázar
Version 1 : Received: 23 July 2020 / Approved: 25 July 2020 / Online: 25 July 2020 (15:54:31 CEST)

A peer-reviewed article of this Preprint also exists.

Trujillo Hernández, J.S.; Talaat, A.; Tabares, J.; Oyola Lozano, D.; Bustos Rodríguez, H.; Martínez Sánchez, H.; Pérez Alcázar, G.A. Structural, Magnetic and Mechanical Properties of Nd16 (Fe76−xCox)B8 0 ≤ x ≤ 25 Alloys. Appl. Sci. 2020, 10, 5656. Trujillo Hernández, J.S.; Talaat, A.; Tabares, J.; Oyola Lozano, D.; Bustos Rodríguez, H.; Martínez Sánchez, H.; Pérez Alcázar, G.A. Structural, Magnetic and Mechanical Properties of Nd16 (Fe76−xCox)B8 0 ≤ x ≤ 25 Alloys. Appl. Sci. 2020, 10, 5656.

Abstract

In this work, the structural, magnetic, and mechanical properties of Nd16Fe76-xCoxB8 alloys varying the Co content at x = 0, 10, 20 and 25, were experimentally investigated by X-Ray Diffraction (XRD), Mössbauer Spectrometry (MS), Vibrating Sample Magnetometry (VSM) at room temperature (RT), and microhardness test were performed too. The system presents the hard Nd2Fe14B and the Nd1.1Fe4B4 phases for samples with x = 0 and 10. When concentration increases to x= 20 and 25, the CoO phase appears. All MS show the ferromagnetic behavior (eight sextets: sites 16k1, 16k2, 8j1, 8j2, 4c, 4e, sb) associated to the hard and soft magnetic phases, and one paramagnetic component (doublet: site d) associated to the minority Nd1.1Fe4B4 phase, which was not identified by XRD. All samples are magnetically hard present a hard magnetic behavior. The increase of Co content in these samples did not improve the hard magnetic behavior, but increased the critical temperature of the system and decrease the crystallite size of the hard phase. The hysteresis loop showed that predominates the Nd2Fe14B hard magnetic phase. There is a general tendency to increase microhardness with cobalt content, attributable to cobalt doping reduces the lattice parameters and porosities in the sample improving it hardness.

Keywords

Mössbauer spectroscopy; X-ray diffraction; Vibrating sample magnetometry; NdFeB magnets

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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