Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix
Samo za registrovane korisnike
2016
Autori
Kasiuk, JuliaFedotova, Julia
Przewoznik, Janusz
Kapusta, Czeslaw
Sikora, Marcin
Zukrowski, Jan
Grce, Ana
Milosavljević, Momir
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
Results of the study of oxidised (FeCoZr)(x)(CaF2)(100) (- x) films in a wide composition range (30 LT = x LT = 74 at.%) sintered at oxygen pressures P-O = 43 and 9.8 mPa with X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray absorption spectroscopy (XAS), Fe-57 Mossbauer spectroscopy (MS), and vibrating sample magnetometry (VSM) are reported. A crystalline metallic core-amorphous oxide shell structure of nanoparticles (NPs) in films oxidised at lower P-O = 43 mPa is observed in TEM images. A combined use of XRD, MS and XAS techniques provides identification of NP phase composition evidencing alpha-FeCo(Zr) core of the variable content depending on x and a complex oxide shell including amorphous alpha-Fe23+O3 together with Co1 - y2+Fey2+O at low x (30-36 at%). Full oxidation of NPs at higher P-O = 9.8 mPa is indicated by TEM, XRD, MS and XAS patterns evidencing the formation of crystalline Co1 - y2+Fey2+O core-amorphous alpha-Fe23+O3 shell structure. Progressive ox...idation of NPs with decreasing x at P-O = 4.3 mPa as well as with Po increase is followed by variation of average centre shifts LT delta GT obtained from deconvoluted Fe-57 Mossbauer spectra. Magnetometry measurements of films sintered at P-O = 43 mPa reveal an effect of exchange bias confirming ferromagnetic metallic core-antiferromagnetic oxide shell structure of NPs. The results show that phase composition of oxide shells is governed both by concentration of oxygen available during synthesis and on the x. Schemes of progressive NP oxidation with identified phase composition as a function of P-o and x values are proposed. (C) 2016 Elsevier Inc. All rights reserved.
Ključne reči:
Granular materials / Nanoparticles / Phase composition / Atomic ordering / Oxidation / Core-shell structureIzvor:
Materials Characterization, 2016, 113, 71-81Izdavač:
- Elsevier
Finansiranje / projekti:
- SILAMPS - Silicon integrated lasers and optical amplifiers (EU-226470)
- Fizički procesi u sintezi novih nanostrukturnih materijala (RS-171023)
- CALIPSO - Coordinated Access to Lightsources to Promote Standards and Optimization (EU-312284)
- Belarusian State programme Functional materials [1.37], Polish Ministry of Science and Higher Education, Mianowski Fund (Warsaw, Poland), EU COST Action MP0903 Nanoalloys as advanced materials: from structure to properties and applications
DOI: 10.1016/j.matchar.2016.01.010
ISSN: 1044-5803; 1873-4189
WoS: 000371937500010
Scopus: 2-s2.0-84955110688
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Kasiuk, Julia AU - Fedotova, Julia AU - Przewoznik, Janusz AU - Kapusta, Czeslaw AU - Sikora, Marcin AU - Zukrowski, Jan AU - Grce, Ana AU - Milosavljević, Momir PY - 2016 UR - https://vinar.vin.bg.ac.rs/handle/123456789/962 AB - Results of the study of oxidised (FeCoZr)(x)(CaF2)(100) (- x) films in a wide composition range (30 LT = x LT = 74 at.%) sintered at oxygen pressures P-O = 43 and 9.8 mPa with X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray absorption spectroscopy (XAS), Fe-57 Mossbauer spectroscopy (MS), and vibrating sample magnetometry (VSM) are reported. A crystalline metallic core-amorphous oxide shell structure of nanoparticles (NPs) in films oxidised at lower P-O = 43 mPa is observed in TEM images. A combined use of XRD, MS and XAS techniques provides identification of NP phase composition evidencing alpha-FeCo(Zr) core of the variable content depending on x and a complex oxide shell including amorphous alpha-Fe23+O3 together with Co1 - y2+Fey2+O at low x (30-36 at%). Full oxidation of NPs at higher P-O = 9.8 mPa is indicated by TEM, XRD, MS and XAS patterns evidencing the formation of crystalline Co1 - y2+Fey2+O core-amorphous alpha-Fe23+O3 shell structure. Progressive oxidation of NPs with decreasing x at P-O = 4.3 mPa as well as with Po increase is followed by variation of average centre shifts LT delta GT obtained from deconvoluted Fe-57 Mossbauer spectra. Magnetometry measurements of films sintered at P-O = 43 mPa reveal an effect of exchange bias confirming ferromagnetic metallic core-antiferromagnetic oxide shell structure of NPs. The results show that phase composition of oxide shells is governed both by concentration of oxygen available during synthesis and on the x. Schemes of progressive NP oxidation with identified phase composition as a function of P-o and x values are proposed. (C) 2016 Elsevier Inc. All rights reserved. PB - Elsevier T2 - Materials Characterization T1 - Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix VL - 113 SP - 71 EP - 81 DO - 10.1016/j.matchar.2016.01.010 ER -
@article{ author = "Kasiuk, Julia and Fedotova, Julia and Przewoznik, Janusz and Kapusta, Czeslaw and Sikora, Marcin and Zukrowski, Jan and Grce, Ana and Milosavljević, Momir", year = "2016", abstract = "Results of the study of oxidised (FeCoZr)(x)(CaF2)(100) (- x) films in a wide composition range (30 LT = x LT = 74 at.%) sintered at oxygen pressures P-O = 43 and 9.8 mPa with X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray absorption spectroscopy (XAS), Fe-57 Mossbauer spectroscopy (MS), and vibrating sample magnetometry (VSM) are reported. A crystalline metallic core-amorphous oxide shell structure of nanoparticles (NPs) in films oxidised at lower P-O = 43 mPa is observed in TEM images. A combined use of XRD, MS and XAS techniques provides identification of NP phase composition evidencing alpha-FeCo(Zr) core of the variable content depending on x and a complex oxide shell including amorphous alpha-Fe23+O3 together with Co1 - y2+Fey2+O at low x (30-36 at%). Full oxidation of NPs at higher P-O = 9.8 mPa is indicated by TEM, XRD, MS and XAS patterns evidencing the formation of crystalline Co1 - y2+Fey2+O core-amorphous alpha-Fe23+O3 shell structure. Progressive oxidation of NPs with decreasing x at P-O = 4.3 mPa as well as with Po increase is followed by variation of average centre shifts LT delta GT obtained from deconvoluted Fe-57 Mossbauer spectra. Magnetometry measurements of films sintered at P-O = 43 mPa reveal an effect of exchange bias confirming ferromagnetic metallic core-antiferromagnetic oxide shell structure of NPs. The results show that phase composition of oxide shells is governed both by concentration of oxygen available during synthesis and on the x. Schemes of progressive NP oxidation with identified phase composition as a function of P-o and x values are proposed. (C) 2016 Elsevier Inc. All rights reserved.", publisher = "Elsevier", journal = "Materials Characterization", title = "Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix", volume = "113", pages = "71-81", doi = "10.1016/j.matchar.2016.01.010" }
Kasiuk, J., Fedotova, J., Przewoznik, J., Kapusta, C., Sikora, M., Zukrowski, J., Grce, A.,& Milosavljević, M.. (2016). Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix. in Materials Characterization Elsevier., 113, 71-81. https://doi.org/10.1016/j.matchar.2016.01.010
Kasiuk J, Fedotova J, Przewoznik J, Kapusta C, Sikora M, Zukrowski J, Grce A, Milosavljević M. Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix. in Materials Characterization. 2016;113:71-81. doi:10.1016/j.matchar.2016.01.010 .
Kasiuk, Julia, Fedotova, Julia, Przewoznik, Janusz, Kapusta, Czeslaw, Sikora, Marcin, Zukrowski, Jan, Grce, Ana, Milosavljević, Momir, "Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix" in Materials Characterization, 113 (2016):71-81, https://doi.org/10.1016/j.matchar.2016.01.010 . .