Enhancement of Coercivity and Maximum Energy Product of Annealed Nd-Fe-B Nanocomposite Alloys

Palash Chandra Karmaker; Mohammad Obaidur Rahman; Nguyen Huy Dan; Samia Islam Liba; Per Nordblad; Sheikh Manjura Hoque

doi:7410203

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Enhancement of Coercivity and Maximum Energy Product of Annealed Nd-Fe-B Nanocomposite Alloys

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Volume 5, 2018
Issue 4 (August)

Pages: 72-77 | Vol. 5, No. 4, August 2018 | Follow on

Paper in PDF Downloads: 23 Since Sep. 1, 2018 Views: 1036 Since Sep. 1, 2018

Authors

[1]

Palash Chandra Karmaker, Department of Physics, Jahangirnagar University, Savar, Dhaka, Bangladesh; Materials Science Division, Atomic Energy Center, Dhaka, Bangladesh; Department of EEE, University of Information Technology & Sciences, Dhaka, Bangladesh.

[2]

Mohammad Obaidur Rahman, Department of Physics, Jahangirnagar University, Savar, Dhaka, Bangladesh.

[3]

Nguyen Huy Dan, Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam.

[4]

Samia Islam Liba, Materials Science Division, Atomic Energy Center, Dhaka, Bangladesh.

[5]

Per Nordblad, Solid State Physics, Department of Engineering Science, Uppsala University, Uppsala, Sweden.

[6]

Sheikh Manjura Hoque, Materials Science Division, Atomic Energy Center, Dhaka, Bangladesh.

Abstract

Nanocomposite Nd_4-xTb_xFe_83.5Co₅Cu_0.5Nb₁B₆ (x=0 and 1) ribbons were prepared by melt spinning technique with constant wheel speed of 40 m/s. The samples have been annealed in an evacuated quartz tube using a pressure of around 10^-5 mbar for 10 minutes at different crystallization temperatures like 675°C, 687°C, 700°C, 712°C and 725°C which are found by differential scanning calorimetry (DSC). Crystallization behavior was studied by X-ray diffraction (XRD) using CuK_α radiation (1.5418Å). The ribbon samples were also characterized by vibrating sample magnetometer (VSM). Highest value of H_c has been obtained as 1.06 kOe for the sample of composition Nd_4-xTb_xFe_83.5Co₅Cu_0.5Nb₁B₆ (x=0) annealed at 700°C for 10 min. At 700°C maximum energy product (BH)_max and remanent ratio (M_r/M_s) have been found to be 2.55 MGOe and 0.61 respectively. Higher Tb substitution has significantly reduced the value of coercivity (H_c) and maximum energy product (BH)_max. The M-H hysteresis loops show extremely soft natures which do not possess any area. However, with the annealing of the samples in the above mentioned temperature evolution of large coercivity was observed due to the formation of exchange couple hard and soft nanocrystal composites.

Keywords

Nanocomposite, Soft and Hard Phase, Coercivity, Maximum Energy Product, Remanent Ratio, Crystallization Temperature

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