Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd7.5Pr2.5Fe90-xBx Melt-Spun Alloys
M. Siddique a, I. Ahmad b, M. Kanwal b and E. Ahmed a
aPhysics Division, PINSTECH, P.O. Nilore, Islamabad, Pakistan
bDepartment of Physics, B.Z. University, Multan, 60800, Pakistan
Received: March 28, 2013; In final form: July 8, 2015
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The Mössbauer spectroscopy and X-ray diffraction techniques have been used to investigate the effect of boron concentration on the structural and magnetic properties of as-quenched and heat-treated melt-spun alloys Nd7.5Pr2.5Fe90-xBx (x=6, 8, 10) produced by melt-spinning technique. X-ray diffraction and Mössbauer spectroscopy results indicate that as-prepared samples are completely amorphous in nature. The X-ray diffraction patterns of samples heat-treated at 700°C are indexed as Fe3B, α-Fe, (NdPr)2Fe14B and Fe23B6 phases. The Mössbauer spectra of heat-treated samples are very complex and constituted a number of sextets and a quadrupole doublet. Two main phases are (NdPr)2Fe14B hard and t-Fe3B soft magnetic phases while α-Fe and Nd23Fe6 are detected as minor phases. The average internal magnetic field decreases with the increase of boron content; more sharply in as-prepared and comparatively slowly in heat-treated samples. The X-ray diffraction and Mössbauer spectroscopy results are in good agreement with each other.

DOI: 10.12693/APhysPolA.128.353
PACS numbers: 76.80.+y, 75.50.-y, 61.43.-j, 61.05.C-