A new structure of Nd1+εFe4B4 phase in NdFeB magnet
نویسندگان
چکیده
منابع مشابه
A new structure of Nd1+εFe4BB4 phase in NdFeB magnet
Sintered NdFeB magnets are relatively complex multiphase systems containing Nd2Fe14B matrix and about 15% of other intermetallics such as Nd1+εFe4BB4, Nd-oxides (Nd-rich phase), etc. Boron rich Nd1+εFe4B4 B forms in irregularly distributed heavily faulted grains of roughly the same size as those of the Nd2Fe14B phase [1]. The Curie temperature of this phase is 13K and, therefore, it is not ferr...
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Recently there has been some concern about possible radiation damage due to ionizing particles present in high energy storage rings such as multi-GeV electrons, fast neutrons, or hard photons. Partial demagnetization has been observed on undulators after mis-steering of the injected electron beam. Our interest was focused to possible radiation damage of a permanent magnet insertion device durin...
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Hot stage in transmission electron microscope has been used to study the structure and stability of Nd-rich phase in NdFeB magnet. The present observation shows that the so-called complex cubic phase is in fact the prototype of Mn2O3 (space group Ia 3) with lattice parameter of a 1⁄4 1:08nm: The Nd-rich phase with P 3m1 structure (h-Nd2O3) was first observed to be transformed from the BCC phase...
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Modelling of Eddy-current Losses in a Surface-mounted Ndfeb Permanent-magnet Generator
In a surface-mounted sintered NdFeB permanent-magnet generator, the magnets are usually thin (typically 4 mm), and hence the armature reaction, due to the time harmonics in the stator currents, is high. NdFeB magnets are conducting (resistivity typically 1.6 μΩm) and experience eddy-current losses. Therefore, the combined eddy-current losses in the NdFeB magnets and a solid iron rotor may becom...
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ژورنال
عنوان ژورنال: Journal of Materials Science
سال: 2005
ISSN: 0022-2461,1573-4803
DOI: 10.1007/s10853-005-2554-y