Nanosized copper ferrite materials: Mechanochemical synthesis and characterization

Manova, Elina; Tsoncheva, Tanya; Paneva, Daniela; Popova, Margarita; Velinov, Nikolay; Kunev, B.; Tenchev, K.; Mitov, Ivan

doi:10.1016/j.jssc.2011.03.035

Cited by 53 publications

(24 citation statements)

References 34 publications

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“…The broadness of diffraction peaks could be explained with presence of nanosized crystallites (\10 nm) and high degree of defects in the crystal structure. Similar diffraction patterns have been observed of mechanochemically synthesized spinel ferrites [9,11].…”

Section: Resultssupporting

confidence: 81%

“…ions occupying octahedral and tetrahedral coordinated positions in ferrite particles with superparamagnetic behavior. Appearance of about 5% sextet components in Cu 0.8 Co 0.2 Fe 2 O 4 -MS2 spectrum is due to increasing of ferrite particle size and formation of ferrimagnetic particles during mechanochemical treatment [9]. The correlation of the duration of mechanochemical treatment on increasing of the crystallite size of ferrites could be seen in Mössbauer spectra recorded at LNT, where the increasing of sextet components' presence is evident.…”

Section: Resultsmentioning

confidence: 86%

“…Mechanochemistry has been recently considered as perspective method for preparation of catalysts because of its effectiveness and even advantages compared to standard methods for catalysts preparation [6]. Nanocrystalline spinel oxides have been appropriately synthesized starting from various precursors with layered double hydroxide (LDH) structure as hydroxide-carbonates [1,[7][8][9][10][11], hydroxide-chlorides [12], etc. The structure and functional properties of synthesized oxides starting from LDH have been observed to be related to the nature (e.g., thermal, spark plasma sintering, mechanochemical) and conditions of treatment of precursors [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Mechanochemical Synthesis and Characterization of Nanocrystalline Copper–Cobalt Ferrites

Velinov

Dimitrov²,

Koleva

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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Nanocrystalline copper-cobalt ferrites with composition Cu 1-x Co x Fe 2 O 4 , where x = 0.2 and 0.8, were synthesized by mechanochemical treatment of co-precipitated precursors. The ferrite powders were characterized by XRD and Mössbauer spectroscopy. Results proved obtaining of spinel ferrites with crystallite size smaller than 10 nm. Increasing of crystallite size of samples with increasing of mechanochemical treatment duration was established, too. Catalytic properties of obtained ferrites were tested in reactions of oxidation of CO, methanol and dimethyl ether. High catalytic activity of nanocrystalline copper-cobalt ferrites toward CO and CH 3 OH (about 100% conversions of CO and CH 3 OH at 160°C) and moderate activity toward (CH 3 ) 2 O oxidation were established. The results obtained revealed that the Co/Cu atomic ratio is an important factor determinant the behavior of catalysts toward methanol and DME oxidation.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanochemical Synthesis and Characterization of Nanocrystalline Copper–Cobalt Ferrites

Velinov

Dimitrov²,

Koleva

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

Self Cite

View full text Add to dashboard Cite

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“…and QS = −0.19 mm·s −1 , which could be attributed to α-Fe 2 O 3 [10]. This change from doublet to sextet is due to the increase of particle size, which could be observed from XRD.…”

Section: Resultsmentioning

confidence: 79%

Magnetism and phase transformation of Cu-Fe composite oxides prepared by the sol-gel route

Xiao¹,

Jin²,

Wang³

et al. 2013

Isiame 2012

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The Cu-Fe composite oxides were prepared by an epoxide assisted sol-gel route. The structural and magnetic properties of Cu-Fe composite oxides calcinated at different temperatures were determined by X-ray diffraction (XRD), Mössbauer spectroscopy measurements, and magnetic measurements. These results indicated that CuFe 2 O 4 was only formed as calcination temperature increased to 500• C, and a crystalline phase transformation from c-CuFe 2 O 4 to t-CuFe 2 O 4 occurred in elevating calcination temperature above it. All Cu-Fe oxides had ferromagnetic nature, and the significant superparamagnetic behavior was observed in the results of magnetic and Mössbauer spectroscopy measurements.

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“…Wherein, the sextets with RI = 33.3 and 58.3 could be attributed to CuFe 2 O 4 -Site B, and CuFe 2 O 4 -Site A, respectively. While the sextet with 57 Fe Mössbauer parameters of IS = 0.38 mm·s −1 and QS = −0.19 mm·s −1 , which could be attributed to α-Fe 2 O 3 [10]. This change from doublet to sextet is due to the increase of particle size, which could be observed from XRD.…”

Section: Resultsmentioning

confidence: 82%

Magnetism and phase transformation of Cu-Fe composite oxides prepared by the sol-gel route

et al. 2013

View full text Add to dashboard Cite

The Cu-Fe composite oxides were prepared by an epoxide assisted sol-gel route. The structural and magnetic properties of Cu-Fe composite oxides calcinated at different temperatures were determined by X-ray diffraction (XRD), Mössbauer spectroscopy measurements, and magnetic measurements. These results indicated that CuFe 2 O 4 was only formed as calcination temperature increased to 500 • C, and a crystalline phase transformation from c-CuFe 2 O 4 to t-CuFe 2 O 4 occurred in elevating calcination temperature above it. All Cu-Fe oxides had ferromagnetic nature, and the significant superparamagnetic behavior was observed in the results of magnetic and Mössbauer spectroscopy measurements.

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Nanosized copper ferrite materials: Mechanochemical synthesis and characterization

Cited by 53 publications

References 34 publications

Mechanochemical Synthesis and Characterization of Nanocrystalline Copper–Cobalt Ferrites

Mechanochemical Synthesis and Characterization of Nanocrystalline Copper–Cobalt Ferrites

Magnetism and phase transformation of Cu-Fe composite oxides prepared by the sol-gel route

Magnetism and phase transformation of Cu-Fe composite oxides prepared by the sol-gel route

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