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

Trujillo Hernández, Juan Sebastián and Talaat, Ahmed and Tabares, Jesús and Oyola Lozano, Dagoberto and Bustos Rodríguez, Humberto and Martínez Sánchez, Hugo and Pérez Alcázar, German Antonio (2020) Structural, Magnetic and Mechanical Properties of Nd16 (Fe76−xCox)B8 0 ≤ x ≤ 25 Alloys. Applied Sciences, 10 (16). p. 5656. ISSN 2076-3417

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In this work, the structural, magnetic and mechanical properties of Nd<sub>16</sub>Fe<sub>76−x</sub>Co<sub>x</sub>B<sub>8</sub> alloys with a varying Co content of x = 0, 10, 20 and 25 were experimentally investigated by X-ray diffraction (XRD), Mössbauer spectrometry (MS) and vibrating sample magnetometry (VSM) at room temperature (RT), and microhardness tests were performed. The system presented hard Nd<sub>2</sub>Fe<sub>14</sub>B and the Nd<sub>1.1</sub>Fe<sub>4</sub>B<sub>4</sub> phases for samples with x = 0; when the concentration increased to x = 20 and 25, the CoO phase appeared. All MS data showed ferromagnetic behavior (eight sextets: sites 16k1, 16k2, 8j1, 8j2, 4c, 4e, sb) associated with the hard and soft magnetic phases, and one paramagnetic component (doublet: site d) associated with the minority Nd<sub>1.1</sub>Fe<sub>4</sub>B<sub>4</sub> phase, which was not identified by XRD. All samples were magnetically hard and presented hard magnetic behavior. The increase of Co content in these samples did not improve the hard magnetic properties but increased the critical temperature of the system and decreased the crystallite size of the hard phase. There was a general tendency towards increased microhardness with cobalt content that was attributable to cobalt doping, which reduces the lattice parameters and porosities within the sample, improving its hardness.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Trujillo Hernández, Juan Sebastián
Talaat, Ahmedaht17@pitt.eduaht17
Tabares, Jesús
Oyola Lozano, Dagoberto
Bustos Rodríguez, Humberto
Martínez Sánchez, Hugo
Pérez Alcázar, German Antonio
Date: 18 September 2020
Date Type: Publication
Journal or Publication Title: Applied Sciences
Volume: 10
Number: 16
Publisher: MDPI AG
Page Range: p. 5656
DOI or Unique Handle: 10.3390/app10165656
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
Uncontrolled Keywords: Mössbauer spectroscopy, X-ray diffraction, vibrating sample magnetometry, NdFeB magnets
ISSN: 2076-3417
Official URL:
Funders: COLCIENCIAS, Convocatoria
Article Type: Research Article
Date Deposited: 19 May 2021 18:21
Last Modified: 19 May 2021 18:21


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