Mössbauer Effect in Metallic Iron

Preston, R. S.; Hanna, S. S.; Heberle, J.

doi:10.1103/physrev.128.2207

Cited by 530 publications

(121 citation statements)

References 36 publications

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“…The low hyperfine field of the component is almost unnoticed without the application of an external field; only at a high external field its value ͑ϳ1.4 T͒ is well defined in the fitting ͑note the estimated errors in Table I͒. According to the proportionality between this hyperfine field and the Fe magnetic moment, 29 the latter can be roughly estimated to be ϳ0.1 Bohr magnetons ͑ B ͒ per Fe atom, confirming the weak ferromagnetism of the sigma phase resulting from intinerant electrons. 30 Figure 9 presents the 80-K Mössbauer spectrum of the annealed FeCr47.7 sample which, as for the spectra of the as-prepared sample, has been fitted to a paramagnetic singlet and a hyperfine field distribution.…”

Section: Magnetic Properties Of -Fecrmentioning

confidence: 98%

Aerosol nanoparticles in the Fe1−xCrx system: Room-temperature stabilization of the σ phase and σ→α-phase transformation

Gich

Shafranovsky

Roig

et al. 2005

Journal of Applied Physics

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The production and structural characterization of gas-evaporated nanoparticles in the Fe 1−x Cr x system, with 0 Ͻ x Ͻ 0.83 are reported. The results show that for x ϳ 0.5 the metastable -FeCr can be stabilized and it constitutes up 60 wt % of the material. The sample with the highest -FeCr content is further analyzed to study the structural and the magnetic properties of this phase and its thermal stability. The -FeCr phase is weakly magnetic with an average magnetic moment of 0.1 B per Fe atom and a Curie temperature below ϳ60 K. It is stable up to 550 K where it starts to transform to bcc-FeCr. Annealing at 700 K yields Cr 2 O 3 due to Cr surface segregation and affects the magnetic behavior of the system, which is dominated by interparticle interactions.

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Section: Magnetic Properties Of -Fecrmentioning

confidence: 98%

Aerosol nanoparticles in the Fe1−xCrx system: Room-temperature stabilization of the σ phase and σ→α-phase transformation

Gich

Shafranovsky

Roig

et al. 2005

Journal of Applied Physics

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“…The areas of the doublets that comprise a Mössbauer spectrum are proportional to the relative number of atoms of the species represented by the doublet, i.e., the relative amount of Fe 2+ in the M1 and M2 sites or the proportion of Fe 2+ (or Fe 3+ ) relative to the total Fe content (e.g., Preston et al 1962;Bancroft et al 1967;Bancroft 1969). A quantitative determination of number of moles of Fe 2+ per site requires a correction for thickness (Rancourt et al 1993) and for the recoil-free fraction ( f ) for the M1 and M2 sites (work currently in progress).…”

Section: Determination Of Site Occupancy In Pyroxenesmentioning

confidence: 99%

Characterization of the 1.2 μm M1 pyroxene band: Extracting cooling history from near‐IR spectra of pyroxenes and pyroxene‐dominated rocks

Klima¹,

Pieters²,

Dyar³

2008

Meteorit & Planetary Scien

108

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in the M1 site measured by Mössbauer spectroscopy. The strength of the 1.2 µm band relative to the combined strengths of the 1.2 and 2 µm bands, or the M1 intensity ratio, is calculated for 51 howardite, eucrite, and diogenite (HED) meteorites. Diogenites and cumulate eucrites exhibit the lowest M1 intensity ratios, consistent with their formation as slowly cooled cumulates. Basaltic eucrites exhibit a large range of M1 intensity ratios, all of which are consistently higher than the diogenites and cumulate eucrites. This example illustrates how the M1 intensity ratio can be a used as a tool for characterizing the cooling history of remotely detected pyroxene-dominated rocks.

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“…A Co ~7 in Pd source of nominal strength 25 mCi was used with an argon-methane proportional counter as 3,-ray detector. Velocity calibration was carried out with high purity metallic iron foil using the data of Preston et al (1962). To minimize thickness effects all absorbers contained -3 mg irordcm 2, prepared as described above.…”

Section: Instrumental Techniquesmentioning

confidence: 99%

Infrared and Mössbauer Studies of Reduced Nontronites

Russell¹,

Goodman²,

Fraser³

1979

Clays and clay miner.

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Abstract--lnfrared and M6ssbauer spectroscopy show that the extent of the reduction of nontronite is dependent on the chemical composition of the nontronite and on the nature of the reducing agent. Hydrazine reversibly reduces about 10% of the iron in all of the nontronltes studied irrespective of composition and it is suggested that the resulting ferrous iron occurs only in distorted octahedral sites. Similar conclusions are reached for the dithionite reduction of the nontronites containing little tetrahedral iron, but for those with more than one in eight silicons replaced by iron, changes brought about by dithionite treatment are irreversible due to dissolution of appreciable quantities of iron. Results from both spectroscopic techniques suggest that iron in tetrahedral sites is preferentially dissolved and that up to 80% of the structural iron can be reduced.Evidence is presented for the formation in these extensively reduced nontronltes of a small amount of a mica-like phase resembling celadonite or glauconite, and, as dithionlte is used for the pretreatment of soils, the implication of this observation is briefly discussed.The use of deuterated hydrazine as a reducing agent has enabled the nontronite absorption band near 850 cm -1 to be assigned to a Si-O (apical) stretching vibration, which is inactive in the infrared for perfect hexagonal symmetry, but which is activated by distortions in the tetrahedral layer.

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Mössbauer Effect in Metallic Iron

Cited by 530 publications

References 36 publications

Aerosol nanoparticles in the Fe1−xCrx system: Room-temperature stabilization of the σ phase and σ→α-phase transformation

Aerosol nanoparticles in the Fe1−xCrx system: Room-temperature stabilization of the σ phase and σ→α-phase transformation

Characterization of the 1.2 μm M1 pyroxene band: Extracting cooling history from near‐IR spectra of pyroxenes and pyroxene‐dominated rocks

Infrared and Mössbauer Studies of Reduced Nontronites

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