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Structural and Magnetic Properties of Nanostructured Pr0.75 Y 0.25Co5 Powders Obtained by Mechanical Milling and Subsequent Annealing

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Abstract

Pr0.75 Y 0.25Co5-based as-cast alloys were processed by high-energy ball milling to obtain nanostructured powders with high coercivity. The powders obtained after 4 h of milling exhibited nearly amorphous behavior in X-ray diffraction patterns. DSC scans of the as-milled powders indicated a process of crystallization by broad, exothermic transition peak at 503 °C. Annealing of the milled powders at 850 °C for 2.5 min in high vacuum produced fine grains of size ranging 15–30 nm with optimal microstructure and hard magnetic properties. Magnetic measurements of the annealed powders evaluated a high intrinsic coercivity, i H c of 9.3 kOe, and a remanence ratio, M r/ M max of 0.72. The magnetic hardening was attributed to higher anisotropy field of the powders and microstructural uniformity achieved by the processing methodologies.

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Acknowledgments

This research was financed by the Higher Education Commission (HEC) of Pakistan. The first author is thankful to the World Federation of Scientists (WFS) for financial support.

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Correspondence to Abid Hussain.

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Hussain, A., Abbas, T., Ziya, A.B. et al. Structural and Magnetic Properties of Nanostructured Pr0.75 Y 0.25Co5 Powders Obtained by Mechanical Milling and Subsequent Annealing. J Supercond Nov Magn 27, 1873–1877 (2014). https://doi.org/10.1007/s10948-014-2525-0

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  • DOI: https://doi.org/10.1007/s10948-014-2525-0

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