Electron Paramagnetic Resonance Study of xFe2O3(1‐x)[B2O3 · PbO] Glasses

Burzo, E.; Chipar, M.; Ungur, D.; Ardelean, I.

doi:10.1002/pssb.2221240244

Cited by 18 publications

(10 citation statements)

References 3 publications

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“…In the present study we have not observed the g " 6.0 resonance line because of a relatively large amount of iron present in the samples. It is reported in literature that the resonance at g " 6.0 is observed only in samples with a very low amount of the iron content [38,39]. The g-values observed in the present study indicate that the iron ions are in the trivalent state and the site symmetry is distorted octahedral.…”

Section: Epr Study Of Fe 3+ Ions In Porous Casiosupporting

confidence: 58%

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EPR Study of Fe3+- and Ni2+-Doped Macroporous CaSiO3 Ceramics

et al. 2008

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Abstract. Thermally stable macroporous CaSiO 3 , Fe 3! -and Ni 2! -doped (0.5 to 5 mol%) ceramics have been prepared by solution combustion process by mixing respective metal nitrates (oxidizers), fumed silica. Diformol hydrazine is used as a fuel. The combustion products were identified by their X-ray diffraction and thermal gravimetry/differential thermal analysis. Single phases of b-CaSiO 3 and a-CaSiO 3 were observed at 950 and 1200 °C, respectively. The phase transition temperatures of combustion-derived CaSiO 3 were found to be lower compared to those obtained via solid-state reaction method. It is interesting to note that with an increase in the calcination temperature the samples become more porous with an increase in the pore diameter from 0.2 to 8 µm. The electron paramagnetic resonance (EPR) spectrum of Fe 3! ions in CaSiO 3 exhibits a weak signal at g " 4.20 ) 0

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Section: Epr Study Of Fe 3+ Ions In Porous Casiosupporting

confidence: 58%

“…The resonance signal at g " 2.0 is due to two or more Fe 3! ions coupled together with dipolar interaction [38,44].…”

Section: Epr Study Of Fe 3+ Ions In Porous Casiomentioning

confidence: 99%

EPR Study of Fe3+- and Ni2+-Doped Macroporous CaSiO3 Ceramics

et al. 2008

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“…Their crystal structures are therefore very similar. Figure 1 illustrates the structure of kaolinite Al 2 [Si 2 O 5 ](OH) 4 . But in montmorillonite and kaolinite structures, the unit cell parameters and symmetry differ very much.…”

Section: Resultsmentioning

confidence: 99%

“…This is because the Debye lines are broad, low intensive and low-resolved for all angles of diffraction. On the other hand, the EPR method turned out to be fruitful due to the anisotropy line 1 [1][2][3][4][5][6][7][8] of intensity increasing with temperature decrease. The resolution of spectral lines increases accordingly.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystals of Montmorillonite in Composites of Ultrahigh-Molecular Weight Polyethylene

Shapovalov

Schwarz

Шаповалов

et al. 2005

Molecular Crystals and Liquid Crystals

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The results of the X-ray diffraction analysis of ultrahigh-molecular weight polyethylene with montmorillonite crystals have shown the Debye lines to be wide and low-resolved for all the diffraction angles. During the investigation of Fe 3þ EPR spectum for montmorillonite single crystals, the effect of crystalline -field multiminimum potential has been revealed in the temperature range from 77 to 300 K. It has been also revealed that the position of Fe 3þ -ion in the electric field is not central. The results of the EPR and X-ray diffraction analysis done on montmorillonite and kaolinite nanocrystalls have shown that the spectra are wellresolved and can be used in future studies of the texture in nanocomposites of ultrahigh -molecular weight polyethylene with kaolinite and montmorillonite crystals.

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“…For the most frequently encountered EPR spectra of Fe 3+ , the typical g-value is close to 2. On the other hand, a resonance line with the g-value close to 4.3 has been analyzed in a number of studies (12)(13)(14)(15) of the EPR spectrum of iron ions in silicate glasses. There is no long-range order in the glasses as well as in the kaolin powder investigated by us.…”

Section: Discussionmentioning

confidence: 99%