TY  - CONF
AU  - Cekić, Božidar
AU  - Ivanovski, Valentin
AU  - Codescu, Mirela Maria
AU  - Umićević, Ana
AU  - Ćirić, Katarina
AU  - Manta, Eugen
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12487
AB  - 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 715oC for 4 min. in argon. Furthermore, X-ray diffraction and transmission 57Fe 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 thermo-magnetic measurements. The magnetic properties, measured at RT on the quenched and annealed ribbons, revealed the relationship between the alloy chemical composition and processing.
PB  - Materials Research Forum
C3  - RoPM AM 2017 : 5th International Conference on Powder Metallurgy & Advanced Materials
T1  - Mössbauer spectroscopic analysis of (Nd,Pr,Dy)2(Fe,Co,Ga)14B/α-Fe permanent magnetic nanocomposites
VL  - 8
SP  - 70
EP  - 79
DO  - 10.21741/9781945291999-8
ER  - 

@conference{
author = "Cekić, Božidar and Ivanovski, Valentin and Codescu, Mirela Maria and Umićević, Ana and Ćirić, Katarina and Manta, Eugen",
year = "2018",
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 715oC for 4 min. in argon. Furthermore, X-ray diffraction and transmission 57Fe 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 thermo-magnetic measurements. The magnetic properties, measured at RT on the quenched and annealed ribbons, revealed the relationship between the alloy chemical composition and processing.",
publisher = "Materials Research Forum",
journal = "RoPM AM 2017 : 5th International Conference on Powder Metallurgy & Advanced Materials",
title = "Mössbauer spectroscopic analysis of (Nd,Pr,Dy)2(Fe,Co,Ga)14B/α-Fe permanent magnetic nanocomposites",
volume = "8",
pages = "70-79",
doi = "10.21741/9781945291999-8"
}

Cekić, B., Ivanovski, V., Codescu, M. M., Umićević, A., Ćirić, K.,& Manta, E.. (2018). Mössbauer spectroscopic analysis of (Nd,Pr,Dy)2(Fe,Co,Ga)14B/α-Fe permanent magnetic nanocomposites. in RoPM AM 2017 : 5th International Conference on Powder Metallurgy & Advanced Materials
Materials Research Forum., 8, 70-79.
https://doi.org/10.21741/9781945291999-8

Cekić B, Ivanovski V, Codescu MM, Umićević A, Ćirić K, Manta E. Mössbauer spectroscopic analysis of (Nd,Pr,Dy)2(Fe,Co,Ga)14B/α-Fe permanent magnetic nanocomposites. in RoPM AM 2017 : 5th International Conference on Powder Metallurgy & Advanced Materials. 2018;8:70-79.
doi:10.21741/9781945291999-8 .

Cekić, Božidar, Ivanovski, Valentin, Codescu, Mirela Maria, Umićević, Ana, Ćirić, Katarina, Manta, Eugen, "Mössbauer spectroscopic analysis of (Nd,Pr,Dy)2(Fe,Co,Ga)14B/α-Fe permanent magnetic nanocomposites" in RoPM AM 2017 : 5th International Conference on Powder Metallurgy & Advanced Materials, 8 (2018):70-79,
https://doi.org/10.21741/9781945291999-8 . .