TY  - 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 . .