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Open AccessArticle

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

1
Facultad de Ciencias Naturales y Matemáticas, Universidad de Ibagué, Ibagué 730007, Colombia
2
Departamento de Física, Universidad del Valle, A. A., Cali 25360, Colombia
3
Departamento de Física, Universidad del Tolima, Ibagué 730006299, Tolima, Colombia
4
Department of Mechanical Engineering & Materials Science, Swanson School of Engineering, University of Pittsburgh, PA 15261, USA
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(16), 5656; https://doi.org/10.3390/app10165656
Received: 23 July 2020 / Revised: 2 August 2020 / Accepted: 6 August 2020 / Published: 14 August 2020
In this work, the structural, magnetic and mechanical properties of Nd16Fe76−xCoxB8 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 Nd2Fe14B and the Nd1.1Fe4B4 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 Nd1.1Fe4B4 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. View Full-Text
Keywords: Mössbauer spectroscopy; X-ray diffraction; vibrating sample magnetometry; NdFeB magnets Mössbauer spectroscopy; X-ray diffraction; vibrating sample magnetometry; NdFeB magnets
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MDPI and ACS Style

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.

AMA Style

Trujillo Hernández JS, Talaat A, Tabares J, Oyola Lozano D, Bustos Rodríguez H, Martínez Sánchez H, Pérez Alcázar GA. Structural, Magnetic and Mechanical Properties of Nd16 (Fe76−xCox)B8 0 ≤ x ≤ 25 Alloys. Applied Sciences. 2020; 10(16):5656.

Chicago/Turabian Style

Trujillo Hernández, Juan S.; Talaat, Ahmed; Tabares, Jesús; Oyola Lozano, Dagoberto; Bustos Rodríguez, Humberto; Martínez Sánchez, Hugo; Pérez Alcázar, German A. 2020. "Structural, Magnetic and Mechanical Properties of Nd16 (Fe76−xCox)B8 0 ≤ x ≤ 25 Alloys" Appl. Sci. 10, no. 16: 5656.

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