DOI: 10.1180/minmag.1975.040.309.11. A Mössbauer study of thermal decomposition of biotites

A Mössbauer study of thermal decomposition of biotites

10.1180/minmag.1975.040.309.11

Crossref journal-article

Mineralogical Society

Mineralogical Magazine (7149)

Abstract

SummaryThe effect of heat treatment in air at temperatures from 200°C to 1000°C of two Cornish biotites has been studied using the M6ssbauer effect in 57Fe. One of the micas was also studied after heating in vacuo.Progressive changes in the Mössbauer spectra of the materials after heat treatment can be correlated with the following processes: Oxidation of Fe2+ ions in isolated octahedral sites to give Fe3+ in the co-ordination Fe3+(OsOH); oxidation of Fe2+ ions in adjacent a-octahedral (cis OH−) sites to give Fe3+(O6); and oxidation of Fe z+ in adjacent a and b (trans OH−) sites to give either Fe3+(O5OH) or Fe3+(O6) depending on whether a shared hydroxyl group remains intact or otherwise (these processes occur at temperatures below 500°C Also, at higher temperatures, dehydroxylation of Fe3+(O5OH) to give more Fe3+ in the Fe3+(O6) configuration. Finally, in the temperature range 900 to 1000°C structural breakdown yielding α-Fe2O3 as the iron-containing phase.The results and interpretation are in good agreement with thermogravimetric data and with a previous infra-red study. The mechanism of charge diffusion in the lattice during oxidation is discussed in the light of the results.

Bibliography

Hogg, C. S., & Meads, R. E. (1975). A MÃ¶ssbauer study of thermal decomposition of biotites. Mineralogical Magazine, 40(309), 79â88.

Authors 2

C. S. Hogg (first)
R. E. Meads (additional)

References 21 Referenced 40

{'key': 'S0026461X00037014_ref12', 'first-page': '5', 'volume': '35', 'author': 'Hodgson', 'year': '1965a', 'journal-title': 'Min. Mag.'} / Min. Mag. by Hodgson (1965a)
10.1002/pssb.2220480260
10.1039/TF9656101317
10.1180/minmag.1970.037.289.11
{'key': 'S0026461X00037014_ref4', 'first-page': '186', 'volume-title': 'MöSssbauer spectroscopy—an introduction for inorganic chemists and geochemists,', 'author': 'Bancroft', 'year': '1973'} / MöSssbauer spectroscopy—an introduction for inorganic chemists and geochemists, by Bancroft (1973)
{'key': 'S0026461X00037014_ref14', 'first-page': '710', 'volume': '10', 'author': 'Hogarth', 'year': '1970', 'journal-title': 'Can. Mineral.'} / Can. Mineral. by Hogarth (1970)
{'key': 'S0026461X00037014_ref13', 'first-page': '445', 'volume': '35', 'author': 'Hodgson', 'year': '1965b', 'journal-title': 'Min. Mag.'} / Min. Mag. by Hodgson (1965b)
{'key': 'S0026461X00037014_ref2', 'first-page': '143', 'volume': '59', 'author': 'Annersten', 'year': '1974', 'journal-title': 'Amer. Min.'} / Amer. Min. by Annersten (1974)
10.1016/0016-7037(57)90016-9
10.1039/jr9650006368
10.1016/0009-2614(69)80067-9
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{'key': 'S0026461X00037014_ref6', 'first-page': '1', 'volume': '3', 'author': 'Brindley', 'year': '1963', 'journal-title': 'Prog. Ceram. Sci.'} / Prog. Ceram. Sci. by Brindley (1963)
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{'key': 'S0026461X00037014_ref20', 'first-page': '482', 'volume': '54', 'author': 'Redder', 'year': '1969', 'journal-title': 'Amer. Min.'} / Amer. Min. by Redder (1969)
10.1180/minmag.1973.039.304.07
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10.1039/jr9620001468
10.1180/claymin.1969.008.2.04
10.1002/pssb.19680300234
10.1088/0022-3719/5/24/018

Dates

Type	When
Created	18 years, 8 months ago (Dec. 8, 2006, 4:42 a.m.)
Deposited	4 years, 7 months ago (Feb. 5, 2021, 12:57 p.m.)
Indexed	1 year, 1 month ago (July 23, 2024, 9:38 p.m.)
Issued	50 years, 6 months ago (March 1, 1975)
Published	50 years, 6 months ago (March 1, 1975)
Published Online	7 years, 2 months ago (July 5, 2018)
Published Print	50 years, 6 months ago (March 1, 1975)

Funders 0

None

BibTeX

@article{Hogg_1975, title={A Mössbauer study of thermal decomposition of biotites}, volume={40}, ISSN={1471-8022}, url={http://dx.doi.org/10.1180/minmag.1975.040.309.11}, DOI={10.1180/minmag.1975.040.309.11}, number={309}, journal={Mineralogical Magazine}, publisher={Mineralogical Society}, author={Hogg, C. S. and Meads, R. E.}, year={1975}, month=mar, pages={79–88} }

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