Paramagnetic Mössbauer relaxation spectra by simple ab initio and stochastic models

Pfannes, H.‐D.; Magalhães-Paniago, R.

doi:10.1007/bf02074261

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…The resonance lines at higher velocity values indicate an Fe 3+ paramagnetic hyperfine-split spectrum component. The paramagnetic hyperfine-split spectrum for Fe 3+ has been simulated using the formalism for calculation presented in reference [8]. This method is based on a simplified ab initio model which is equivalent to the Clauser-Blume model [9].…”

Section: Resultsmentioning

confidence: 99%

Local interactions of⁵⁷Fe after electron capture of⁵⁷Co implanted in alpha-Al₂O₃and in alpha-Fe₂O₃

Dézsi¹,

Szücs²,

Fetzer³

et al. 2000

J. Phys.: Condens. Matter

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-Al2 O3 and -Fe2 O3 were implanted with 57 Co at room temperature. -Al2 O3 showed complex Mössbauer spectra indicating paramagnetic hyperfine splitting for high-spin Fe3+ and electric quadrupole-split spectra for Fe2+ ions. In canted antiferromagnet -Fe2 O3 , the implanted Co atoms were positioned substitutionally in Fe2 O3 and at higher doses in Fe3 O4 and in Fe1-x O. In the different phases, the ions were in Fe2+ and/or in Fe3+ states after the electron capture of 57 Co; no after-effects were observed. The results suggest that the phases are formed during fast cooling and crystallization of the oxide from the high-temperature state of the thermal spike.

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Section: Resultsmentioning

confidence: 99%

Local interactions of⁵⁷Fe after electron capture of⁵⁷Co implanted in alpha-Al₂O₃and in alpha-Fe₂O₃

Dézsi¹,

Szücs²,

Fetzer³

et al. 2000

J. Phys.: Condens. Matter

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“…[26]). A rapid development of the corresponding methodologies, especially for the stochastic treatment, which is more suitable for a matrix-based analysis, took place over the last decade (see e.g., [27,28]). Unfortunately, all these methods offer only improved mathematical treatments for the simplest case of Fe positions characterized by discrete hyperfine parameters relaxing with a certain relaxation time.…”

Section: Magnetic Relaxationmentioning

confidence: 99%

Magnetic relaxation phenomena and inter-particle interactions in nanosized -Fe₂O₃systems

Predoi

Kuncser

Tronc

et al. 2003

J. Phys.: Condens. Matter

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Samples of γ -Fe 2 O 3 nano-particles with a mean size of 4.0(3) nm and with different hydration and surfactant degrees were prepared by sol-gel methods. Morphology and structural data were obtained by transmission electron microscopy and x-ray diffraction, whereas the surface effects and hyperfine interactions were analysed mainly by Mössbauer spectroscopy. The relative number of surface iron positions was found to be proportional to the amount of OH − and SO 2− 4 groups on the particle surface, which in turn is strictly dependent on the preparation conditions. Strong relaxation processes versus temperature were evidenced in the analysed systems. New criteria for the evaluation of the blocking temperature via Mössbauer measurements are proposed. The results are in good agreement with blocking temperatures obtained by magnetic measurements. Moreover, it was shown that the interparticle magnetic interactions decrease with the number of iron surface states.

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Mössbauer study of iron-doped lithium niobate

et al. 1994

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Paramagnetic Mössbauer relaxation spectra by simple ab initio and stochastic models

Cited by 8 publications

References 7 publications

Local interactions of⁵⁷Fe after electron capture of⁵⁷Co implanted in alpha-Al₂O₃and in alpha-Fe₂O₃

Local interactions of⁵⁷Fe after electron capture of⁵⁷Co implanted in alpha-Al₂O₃and in alpha-Fe₂O₃

Magnetic relaxation phenomena and inter-particle interactions in nanosized -Fe₂O₃systems

Mössbauer study of iron-doped lithium niobate

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Paramagnetic Mössbauer relaxation spectra by simple ab initio and stochastic models

Cited by 8 publications

References 7 publications

Local interactions of57Fe after electron capture of57Co implanted in alpha-Al2O3and in alpha-Fe2O3

Local interactions of57Fe after electron capture of57Co implanted in alpha-Al2O3and in alpha-Fe2O3

Magnetic relaxation phenomena and inter-particle interactions in nanosized -Fe2O3systems

Mössbauer study of iron-doped lithium niobate

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Product

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Local interactions of⁵⁷Fe after electron capture of⁵⁷Co implanted in alpha-Al₂O₃and in alpha-Fe₂O₃

Local interactions of⁵⁷Fe after electron capture of⁵⁷Co implanted in alpha-Al₂O₃and in alpha-Fe₂O₃

Magnetic relaxation phenomena and inter-particle interactions in nanosized -Fe₂O₃systems