Magnetic properties and structural parameters of nanosized oxide ferrimagnet powders produced by mechanochemical synthesis from salt solutions

Найден, Е. П.; Журавлев, В. А.; Итин, В. И.; Terekhova, O. G.; Магаева, А. А.; Ivanov, Yu. F.

doi:10.1134/s1063783408050156

Cited by 30 publications

(14 citation statements)

References 3 publications

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“…X-ray patterns 7-10 (Fig. 1) for the FeCoZr-PZT films synthesized at a higher oxygen pressure (Р O = 3.7 • 10 -3 Pa) exhibits one dominating reflection at 2Q ≈ 33 deg which is close to that of iron oxides [14]. However the (110) diffraction line of a-FeCo(Zr,O) is completely absent.…”

Section: X-ray Structural Analysismentioning

confidence: 94%

“…This reflection line is heavily broadened, D(2Q) = 6.0 deg, due to the nanoscale size of the particles. All the X-ray patterns exhibit a broadened line at low reflection angles corresponding to a superimposition of the contributions from the PZT matrix [13] and iron oxides and/or cobalt ferrites [14,15]. Comparison of X-ray patterns 1 and 6 in Fig.…”

Section: X-ray Structural Analysismentioning

confidence: 99%

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Effect of synthesis conditions and composition on structural and phase states and electrical properties of nanogranular (FeCoZr)x (PZT)100-x films (30 ≤ x ≤ 85 at.%)

Fedotova¹

2021

MoEM

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Granular films containing Fe50Co50Zr10 alloy nanoparticles inside Pb0,81Sr0,04(Na0,5Bi0,5)0,15(Zr0,575Ti0,425)O3 (PZT) ferroelectric matrix possess a combination of functional magnetic and electrical properties which can be efficiently controlled by means of external electric or magnetic fields. The formation of the required granular structure in PZT matrix is only possible if synthesis is carried out in an oxygen-containing atmosphere leading to substantial oxidation of metallic nanoparticles. Thus an important task is to study the oxidation degree of metallic nanoparticles depending on synthesis conditions and the effect of forming phases on the electrical properties of the films. The relationship between the structural and phase state and electrical properties of granular FeCoZr)x (PZT)100-x films (30 ≤ x ≤ 85 at.%) synthesized in an oxygen-containing atmosphere at the oxygen pressure PO in a range of (2.4–5.0) · 10–3 Pa has been studied using X-ray diffraction, EXAFS and four-probe electrical resistivity measurement. Integrated comparative analysis of the structural and phase composition and local atomic order in (FeCoZr)x (PZT)100-x films has for the first time shown the fundamental role of oxygen pressure PO during synthesis on nanoparticle oxidation and phase composition. We show that the oxygen pressure being within PO = 3.2 · 10–3 Pa an increase in x leads to a transition from nanoparticles of Fe(Co,Zr)O complex oxides to a superposition of complex oxides and a-FeCo(Zr,O) ferromagnetic nanoparticles (or their agglomerations). At higher oxygen pressures РО = 5.0 · 10–3 Pa the nanoparticles undergo complete oxidation with the formation of the (FexCo1-x)1-δO complex oxide having a Wurtzite structure. The forming structural and phase composition allows one to explain the observed temperature dependences of the electrical resistivity of granular films. These dependences are distinguished by a negative temperature coefficient of electrical resistivity over the whole range of film compositions at a high oxygen pressure (РО = 5.0 · 10–3 Pa) and a transition to a positive temperature coefficient of electrical resistivity at a lower oxygen pressure (РО = 3.2 · 10–3 Pa) in the synthesis atmosphere and x > 69 at.% in the films. The transition from a negative to a positive temperature coefficient of electrical resistivity which suggests the presence of a metallic contribution to the conductivity is in full agreement with the X-ray diffraction and EXAFS data indicating the persistence of unoxidized a-FeCo(Zr,O) ferromagnetic nanoparticles or their agglomerations.

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Section: X-ray Structural Analysismentioning

confidence: 94%

Section: X-ray Structural Analysismentioning

confidence: 99%

Effect of synthesis conditions and composition on structural and phase states and electrical properties of nanogranular (FeCoZr)x (PZT)100-x films (30 ≤ x ≤ 85 at.%)

Fedotova¹

2021

MoEM

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“…9, and here M and Oe in the figure represent magnetization intensity and magnetic field strength. The test result reveals that the saturation magnetization (Ms) of sludge is 67.5 emu/g, which is lower than nanopowder Fe 3 O 4 (92 emu/g) [32] but higher than CuFe 2 O 4 (26 emu/g) [33].…”

Section: Squid Measurementmentioning

confidence: 97%

Treatment of printed circuit board industrial wastewater by Ferrite process combined with Fenton method

Lou

Huang

Han

2009

Journal of Hazardous Materials

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“…It should be mentioned that the pyromagnetic constant of the CoFe 2 O 4 is not available in the literature and some authors chose it to be equal to zero, see Tang and Yu (2009), Challagulla and Georgiades (2011), and Kim et al (2012), for example. In this article, the value of the slope of the magnetic flux with respect to temperature d B /d θ = 0.01 T/K has been determined from Figure 9 of Naiden et al (2008) at room temperature. By employing equation (6), the value of the pyromagnetic constant α 12 of CoFe 2 O 4 is determined as 65 A/(mK).…”

Section: Applicationsmentioning

confidence: 99%

The electric, magnetic, and elastic fields in damaged thermo-electro-magneto-elastic composites created by heat flow

Aboudi

2017

Journal of Intelligent Material Systems and Structures

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A two-scale (micro-to-macro) analysis is presented for the prediction of the response of thermo-electro-magneto-elastic composites with localized damage which are subjected to remote heat flow. The localized damage may represent cracks, inclusions, and cavities. The present analysis generalizes a previous one which predicted the behavior of such composites to remote electro-magneto-elastic loadings. Consequently, the present generalization enables the application of any form of combined loading including remote heat flow. The present generalization necessitates the introduction of the heat equation. For an insulated (adiabatic) crack, the heat equation solution must satisfy the requirement that zero heat flux should be imposed on its surfaces (in addition to the electric, magnetic, and elastic boundary conditions on these surfaces). Thus, the present analysis involves spatially varying thermal, electric, magnetic, and elastic interacting fields. In the special case of applied heat flow, the present approach is capable of predicting the created electric, magnetic, and elastic field distributions in the composite. Verifications of the method are presented, and applications are given for thermo-magneto-electro-elastic composites with cracks and cavities. The method is also illustrated in the cases of porous and layered composites with cracks that are subjected to heat flow.

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Magnetic properties and structural parameters of nanosized oxide ferrimagnet powders produced by mechanochemical synthesis from salt solutions

Cited by 30 publications

References 3 publications

Effect of synthesis conditions and composition on structural and phase states and electrical properties of nanogranular (FeCoZr)x (PZT)100-x films (30 ≤ x ≤ 85 at.%)

Effect of synthesis conditions and composition on structural and phase states and electrical properties of nanogranular (FeCoZr)x (PZT)100-x films (30 ≤ x ≤ 85 at.%)

Treatment of printed circuit board industrial wastewater by Ferrite process combined with Fenton method

The electric, magnetic, and elastic fields in damaged thermo-electro-magneto-elastic composites created by heat flow

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