Mössbauer Study of the Attenuation of Iron in an Irrigated Greensand Lysimeter

Ross, C. A. M.

doi:10.1346/ccmn.1980.0280106

Cited by 17 publications

(11 citation statements)

References 17 publications

(18 reference statements)

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“…A temperature dependence of the quadrupole splitting of the Fe 2+ doublets was observed between 20 and 300 K, quite similarly to that found in the work [8]. Neither magnetic component nor subspectra of tetrahedral Fe 3+ were identified in the Mössbauer spectra.…”

Section: Resultssupporting

confidence: 83%

Mössbauer characteristics of glauconitisation

et al. 2008

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57 Fe Mössbauer spectroscopy, X-ray diffraction and local (WDX, EDX) and bulk chemical methods (ICP-AES complemented with Fe 2+ titration) were used to study glauconites originating from three sandstone samples (NY1, NY3 and EWT) of the Upper Oligocene Eger Formation (Northern Hungary). The, during glauconitisation, increasing aggregate density and magnetic susceptibility offered a unique possibility to separate grains of different evolutionary stage from the same glauconite population. 57 Fe Mössbauer spectra of both structurally and chemically well characterised glauconite fractions were decomposed into four doublets. Twotwo of the doublets were assigned to octahedral Fe 2+ and octahedral Fe 3+ . Fe 2+ /Fe values determined by Mössbauer measurements were used for the calculation of the chemical formula of glauconite samples [including octahedral occupancy (B O ) E. Kuzmann et al. and octahedral charge (X O ) as well]. The gradual increase of Fe 2+ /Fe was documented with the increase of aggregate density in correlation with the foregoing of glauconitisation. Our results give a quantitative demonstration that octahedral occupancy (B O ) decrease and the substitution of octahedral Al by Fe 2+ are the major processes allowing the interlayer K incorporation during glauconitisation. The systematic crystalchemical evolution as reflected in the systematic changes of the Mössbauer data are discussed in terms of the subsequent steps of glauconitisation.

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Section: Resultssupporting

confidence: 83%

Mössbauer characteristics of glauconitisation

et al. 2008

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“…This glauconite has a higher iron content and also a large tetrahedral Fe 3+ component, which also confirms the hypothesis that an increasing extent of Fe 3+ tetrahedral substitution progressively directs iron substitution within the octahedral layer towards cis-OH sites. This assignment of the Fe 2+ resonances confirms those of McConchie et al (1979) and Ross and Longworth (1980) and negates those ofRolfet al (1977), Rozenson and Heller-Kallai (1979), Kotlicki et al (1981), and De Grave et al (1985).…”

Section: Francosia and Fiji Glauconitessupporting

confidence: 83%

“…The M6ssbauer spectra of illite and glauconite have also been reported by a number of workers (Rolf et al, 1977;Rozenson and Heller-Kallai, 1978;McConchie et al, 1979;Ross and Longworth, 1980;Kotlicki et al, 1981;De Grave et al, 1985). In general, these spectra show the presence of both Fe 2+ and Fe 3+ in the structure, and most spectra have been resolved into two Fe 3+ and two Fe 2+ doublets (e.g., De Grave et aL, 1985).…”

Section: Introductionsupporting

confidence: 63%

“…A controversy exists, however, in assigning the Fe 2+ doublets. Rolfet al (1977), Rozenson and Heller-Kallai (1978), Kotlicki et al (1981), andDe Grave et al (1985) considered that the Fe 2+ doublet having the larger quadrupole interaction arises from Fe 2+ in cis-OH sites, whereas McConchie et al (1979) and Ross and Longworth (1980) assigned this doublet to Fe 2+ in trans-OH sites.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Iron Substitution in Montmorillonite, Illite, and Glauconite by ⁵⁷Fe Mössbauer Spectroscopy

Johnston

Cardile

1987

Clays and clay miner.

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Abstract--The ~TFe M6ssbauer spectra of an iron-rich montmorillonite, an illite, and two glauconites were measured and computer-fitted with appropriate Fe 3+ and Fe 2+ doublet resonances. The broad experimental Fe 3 § resonance of montmorillonite probably arises from Fe 3 § in the octahedral sites and a trans-arrangement of OH groups; however, a large variation in the neighboring environment of these sites exists. In illite this Fe 3 § resonance is similar but shows less broadening; it arises from Fe 3+ located predominantly in trans-OH octahedral sites, with some Fe 3 § being located in cis-OH octahedral sites. Because of the increased iron content less variation exists, compared with montmorillonite, in the neighboring octahedral sites. The Fe 3 § resonance is narrower still for the glauconites and represents Fe 3 § substituting primarily into cis-OH octahedral sites, similar to that previously reported for nontronite.The tetrahedral Fe 3 § content is very low for montmorillonite and increases progressively for illite and glauconite, suggesting that a higher tetrahedral Fe 3 § content directs Fe 3 § in the octahedral layer into cis-OH sites. In montmorillonite, the Fe 2 § is located only in trans-OH sites; in illite Fe 2 § is largely in trans-OH sites and only slightly in cis-OH sites; and in glauconite, Fe 2 § is located largely in cis-OH sites and only slightly in trans-OH sites. These assignments suggest that for FC-, the doublet with the larger quadrupole interaction arises from Fe 2 § in trans-OH sites and the doublet with the smaller quadrupole interaction, from Fe 2+ in cis-OH sites.

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“…Ross and Longworth (1980) measured the spectrum at 4.2~ and in a 45 kG longitudinally applied magnetic field of a noncrystalline ferric hydroxide phase precipitated on a sandy clay. The spectral contribution of the gel was not well resolved from that of other Fe species present, but it appeared to be quite broadened, with a splitting of about 490 kOe.…”

Section: Relaxation and Magnetic Effectsmentioning

confidence: 99%