Magnetic properties of ND Rich Melt-Spun ND-FE-B alloy

Grujić, Aleksandar; Talijan, M Nadezda; Maricic, M Aleksa; Stajic-Trosic, T Jasna; Ćosović, Vladan; Radojević, Vesna

doi:10.2298/sos0502139g

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…The as-quenched powders of these alloys were subsequently annealed to the optimized magnetic state. The applied heat treatment regimes were optimized in previous investigations [5][6][7][8][9]. Basic data concerning preparation method and magnetic properties of both powder samples of the investigated alloys are summarized in Tab.…”

Section: Methodsmentioning

confidence: 99%

Study of Nd-Fe-B alloys with nonstoichiometric Nd content in optimal magnetic state

Ćosović¹,

Talijan²,

Grujić³

et al. 2009

SCI SINTER

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Characterization of two rapid-quenched Nd-Fe-B alloys with nonstoichiometric Nd content in the optimized magnetic state was carried out using the X-ray diffractometry (XRD), 57Fe Mössbauer spectroscopic phase analysis (MS), electron microscopy (TEM), high resolution TEM (HREM) and Superconducting Quantum Interference Device (SQUID) magnetometer. The experimental results demonstrate the fundamental difference in the structure and magnetic properties of the two investigated alloys in the optimized magnetic state. The Nd-Fe-B alloy with the reduced Nd content (Nd4.5Fe77B18.5) was found to have the nanocomposite structure of Fe3B/Nd2Fe14B and partly α-Fe/Nd2Fe14B, with mean grain size below 30 nm. On the other side, the overstoichiometric Nd14Fe79B7 alloy has almost a monophase structure with the dominant content of the hard magnetic phase Nd2Fe14B (up to 95 wt. %) and a mean crystallite size about 60 nm, as determined by XRD and TEM analysis. The results of magnetic measurements on SQUID magnetometer also suggest the nanocomposite structure of the Nd-low alloy and nanocrystalline decoupled structure of the Nd-rich alloy after the optimal heat treatment

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Section: Methodsmentioning

confidence: 99%

Study of Nd-Fe-B alloys with nonstoichiometric Nd content in optimal magnetic state

Ćosović¹,

Talijan²,

Grujić³

et al. 2009

SCI SINTER

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“…Grains of this phase are magnetically isolated (decoupled) by intergranular layers of Nd-rich phases. [5][6][7] This structure leads essentially to a magnetic decoupling and each hard magnetic grain behaves like a small permanent magnet, which results in high coercivities. 1,8 The superior magnetic performance of this type of Nd-Fe-B alloy arises from the higher values of coercivity compared to nanocomposite Nd-Fe-B alloys 9,10 and ferrite-based magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

An overstoichiometric Nd-Fe-B hard magnetic material

Žák

Talijan

Cosovic

et al. 2010

JSCS

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A commercial Nd-rich Nd-Fe-B-based hard magnetic material was studied. The obtained results were compared before and after recording of the thermomagnetic curve up to 800 °C. The curve itself showed clearly besides Curie points of the Nd 2 Fe 14 B phase and α-Fe also another critical temperature. Mössbauer spectroscopic (MS) phase analysis and X-ray diffraction analysis (XRD) showed in addition to the commonly known phases Nd 2 Fe 14 B and NdFe 4 B 4 also some paramagnetic and ferromagnetic iron atoms (MS) and Fe 17 Nd 2 intermetallics (XRD). During the exerted thermal treatment, the content of the Nd 2 Fe 14 B and NdFe 4 B 4 phases remained almost unchanged, while iron atoms from remnant minor phases built a separate α-Fe phase. The XRD pattern also showed the presence of some minor Nd phase. The results of Squid magnetic measurements suggest a nanocrystalline decoupled structure of the Nd-rich alloy in the optimized magnetic state. Measurement of the magnetization loop showed, in spite of small changes in the phase composition, that magnetic properties of the quality material deteriorated during the thermal treatment.

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Structural and phase composition modification of nanocrystalline Nd14Fe79B7 alloy during thermomagnetic measurements

Talijan¹,

Ćosović²,

Žák

et al. 2009

J min metall B Metall

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Changes in the microstructure parameters, phase composition and magnetic properties of rapid quenched Nd-rich Nd14Fe79B7 alloy caused by thermomagnetic measurement (TM) were studied using XRD methods of phase analysis, crystallite size and lattice microstrain determination. The observed changes were analyzed between the optimized magnetic state of this alloy and state after TM up to 800oC. Measurement of magnetic properties was carried out on the SQUID magnetometer at ambient temperature. The obtained experimental results show that the investigated alloy in the optimized magnetic state has nearly monophase composition with predominant content of hard magnetic Nd2Fe14B phase (up to 95 mass %) with mean crystallite size below 60 nm. In the state after TM, it was found that the decreased amount of Nd2Fe14B phase (75 mass%), increased amount of soft magnetic phases, predominantly of Fe7Nd5, formation of Nd-rich oxide Nd2O3 phase, as well as grain growth have caused the observed quality loss of hard magnetic properties

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Magnetic properties of ND Rich Melt-Spun ND-FE-B alloy

Cited by 4 publications

References 4 publications

Study of Nd-Fe-B alloys with nonstoichiometric Nd content in optimal magnetic state

Study of Nd-Fe-B alloys with nonstoichiometric Nd content in optimal magnetic state

An overstoichiometric Nd-Fe-B hard magnetic material

Structural and phase composition modification of nanocrystalline Nd14Fe79B7 alloy during thermomagnetic measurements

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