Effect of Mn on the magnetic properties of Fe3B/Nd2Fe14B nanocomposites

Rajasekhar, M.; Akhtar, D.; Raja, M. Manivel; Ram, Sanjay K.

doi:10.1016/j.jmmm.2008.01.029

Cited by 14 publications

(5 citation statements)

References 26 publications

(27 reference statements)

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“…From XRD studies it is evident that the desired (Nd,Pr) 2 Fe 14 B and Fe 3 B composite crystallizes out of amorphous phase in two stages. The metastable (Nd,Pr) 2 Fe 23 B 3 phase, which crystallizes along with Fe 3 B phase in the first stage (T p1 ), decomposes to form (Nd,Pr) 2 Fe 14 B and Fe 3 B during the second stage (T p2 ) [11,16,17]. Similar crystallization behavior has been observed for all the other ribbons also.…”

Section: Resultssupporting

confidence: 68%

“…A disadvantage of the nanocomposite alloys is the decrease in i H c accompanying the M r enhancement, which adversely affects (BH) max , in spite of the continuing increase in M r . Many attempts have been made to improve i H c and (BH) max of the nanocomposites further by elemental substitution [7][8][9][10][11]. One such attempt is partial replacement of Nd by Pr or Dy rare earth elements.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and magnetic properties of (Nd1−yPry)4.5Fe77B18.5 nanocomposite alloys

Rajasekhar¹,

Akhtar²,

Chandrasekaran³

et al. 2009

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Microstructure and magnetic properties of (Nd1−yPry)4.5Fe77B18.5 nanocomposite alloys

Rajasekhar¹,

Akhtar²,

Chandrasekaran³

et al. 2009

Journal of Alloys and Compounds

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“…Concerning the magnetic properties, only very few reports on nanoscale borides can be found in literature, rare examples being iron boride–silica core–shell nanoparticles or ultrafine cobalt boride particles. , A synthesis route starting from metal salts and sodium tetrahydroborate in solvents yields nanoscale boride powders , that may turn out to be interesting magnetic materials for cancer treatment, either in hyperthermia or in boron neutron capture therapy. Such particles also recently received attention as one of the components suitable for core–shell particles or composite materials, to combine hard and soft magnetic properties. − …”

Section: Introductionmentioning

confidence: 99%

Size and Crystallinity Dependence of Magnetism in Nanoscale Iron Boride, α-FeB

Rades

Kräemer²,

Seshadri³

et al. 2014

Chem. Mater.

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A nanoscale boride, α-FeB, with grains of variable size and crystallinity was synthesized by precipitation from solution followed by heat treatment (450 °C, 550 °C, 750 °C, 1050 °C). Analysis of transmission electron micrographs, electron diffraction, and magnetic measurements suggests superparamagnetism at room temperature for the smaller, more disordered particles of FeB, while the larger, more crystalline particles of α-FeB, with a particle size of approximately 20 nm, display open magnetic hysteresis loops and blocking. In contrast to the soft ferromagnetism of bulk β-FeB, which was synthesized by conventional solid state reaction at 1500 °C, the sample of α-FeB annealed at 1050 °C is a harder ferromagnet, possibly due to stacking faults that pin the magnetic domains; these stacking faults are apparent in the high resolution transmission electron micrographs. The changes in magnetic behavior are visible from the varying blocking temperatures (63 K, 94 K, 150 K, and >320 K from the smallest to the largest particles) and correlate with the transformations from amorphous to α-FeB and from α-FeB to β-FeB.

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“…The relaxation of interface stresses between the particles can also contribute to the exothermic peak at around 440 • C. The presence of ␣-Fe in Nd 2 Fe 14 B milled sample was also detected by XRD measurements. The crystallisation path observed in some amorphous ribbons take place in two ways: amorphous phase (Am) → Am + Fe 3 B → Fe 3 B + Nd 2 Fe 23 B 3 → Fe 3 B + Nd 2 Fe 14 B, or (Am) → Am + Fe 3 B → Fe 3 B + Nd 2 Fe 14 B [7,20,[36][37][38][39]. Unlike these situations, in our case for the as-milled composite powders, the thermomagnetic measurements indicate the presence of the Fe 3 B phase (T C around 800 K) in addition to the starting phases Nd 2 Fe 14 B and Fe [29].…”

Section: Resultsmentioning

confidence: 99%