Mössbauer spectroscopic analysis of (Nd,Pr,Dy)2(Fe,Co,Ga)14B/α-Fe permanent magnetic nanocomposites

E. Manta, B. Cekić, V. Ivanovski, A. Umićević, Katarina Ćirić
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引用次数: 1

Abstract

In this paper, it is reported the structural and magnetic properties of Nd13.7Pr0.7Dy0.2Fe73.1Co6.3Ga0.4B5.6 and Nd7.7Pr0.7Dy0.2Fe79.1Co6.3Ga0.4B5.6 magnetic nanocomposites, synthesized by melt-spinning and annealing methods. The Nd-Fe-B ribbons are melt-spun at v=30 m/s in high vacuum and annealed at 715C for 4 min. in argon. Furthermore, Xray diffraction and transmission Fe Mössbauer spectra at RT are used to investigate the effects of substituent elements: Dy, Pr, Co, Ga on the hard magnetic properties and microstructure of both nanocomposites. Analysis of Mössbauer spectra for Nd13.7Pr0.7Dy0.2Fe73.1Co6.3Ga0.4B5.6 is done in terms of ten Zeeman sextets, one paramagnetic doublet related to Nd1.1Fe4B4 phase and two hyperfine magnetic fields distributions extracted from spectrum. Similar result of analysis of the second nanocomposite is obtained with eleven sextets, one doublet and one distribution. One sextet corresponds to α-Fe phase, while we have identified six iron sextets corresponding to the six distinct iron sites in the Nd2Fe14B structure: 16k1, 16k2, 8j1, 8j2, 4c and 4e. The three remaining sextets belong to Fe3B structure with three inequivalent Fe sites: FeI(8g), FeII(8g) and FeIII(8g). The eleventh sextet of Nd7.7Pr0.7Dy0.2Fe79.1Co6.3Ga0.4B5.6 belongs to FeB. All relevant parameters for both nanocomposites: magnetic hyperfine field, isomer shift and quadrupole splitting are determined for each of these sites. To highlight the thermally induced structural transformations, the quenched samples have been analysed by differential scanning calorimetry and thermomagnetic measurements. The magnetic properties, measured at RT on the quenched and annealed ribbons, revealed the relationship between the alloy chemical composition and processing.
Mössbauer (Nd,Pr,Dy)2(Fe,Co,Ga)14B/α-Fe永磁纳米复合材料的光谱分析
本文报道了采用熔融纺丝和退火法制备的Nd13.7Pr0.7Dy0.2Fe73.1Co6.3Ga0.4B5.6和nd7.7 pr0.7 dy0.2 fe70.1 co6.3 ga0.4 b5.6磁性纳米复合材料的结构和磁性能。Nd-Fe-B带在高真空中以v=30 m/s的速度熔融纺丝,并在715℃氩气中退火4 min。此外,利用x射线衍射和透射Fe Mössbauer在RT下的光谱研究取代元素:Dy, Pr, Co, Ga对两种纳米复合材料的硬磁性能和微观结构的影响。对Nd13.7Pr0.7Dy0.2Fe73.1Co6.3Ga0.4B5.6的Mössbauer光谱进行了10个Zeeman六重体、1个与Nd1.1Fe4B4相相关的顺磁偶极体和从光谱中提取的2个超精细磁场分布的分析。第二种纳米复合材料具有11个六重体、1个双重体和1个分布,得到了类似的分析结果。一个六元体对应α-Fe相,而我们已经确定了六个铁六元体对应于Nd2Fe14B结构中的六个不同的铁位点:16k1, 16k2, 8j1, 8j2, 4c和4e。其余三种六元体属于Fe3B结构,具有三个不相等的铁位:FeI(8g), FeII(8g)和FeIII(8g)。nd7.7 pr0.7 dy0.2 fe70.1 co6.3 ga0.4 b5.6的第11个六重体属于feb,并确定了这两种纳米复合材料的相关参数:超精细磁场、同分异构体位移和四极分裂。为了突出热诱导的结构转变,用差示扫描量热法和热磁测量对淬火样品进行了分析。对淬火带和退火带的磁性能进行了RT测量,揭示了合金的化学成分与加工过程之间的关系。
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