DOI: 10.1002/bbpc.19770810320. Defects and Cation Diffusion in Magnetite (I)

Defects and Cation Diffusion in Magnetite (I)

10.1002/bbpc.19770810320

Crossref journal-article

Wiley

Berichte der Bunsengesellschaft für physikalische Chemie (311)

Abstract

AbstractUsing radioactive tracer Fe‐59 and measuring rest activities after sectioning, the tracer diffusivities of Fe in almost single crystalline magnetite Fe3‐ΔO4 have been measured as a function of temperature and oxygen partial pressure. The measured curves log DFe*/log pO2 all exhibit a minimum in the temperature range between 900°C and 1400°C in the homogeneity range of the magnetite. At sufficiently high oxygen partial pressures the slope ϱ log D Fe*/log pO2 is 2/3: at sufficiently low partial pressures it is —2/3. This allows to conclude that stoichiometric Fe3O4 has a Frenkel disorder in the cationic sublattice, while at high oxygen potentials iron ion vacancies are responsible for the cation deficit. Their electrical charge is balanced by threevalent iron ions.

Bibliography

Dieckmann, R., & Schmalzried, H. (1977). Defects and Cation Diffusion in Magnetite (I). Berichte Der Bunsengesellschaft FÃ¼r Physikalische Chemie, 81(3), 344â347. Portico.

Authors 2

R. Dieckmann (first)
H. Schmalzried (additional)

References 6 Referenced 181

10.1111/j.1151-2916.1973.tb15423.x
10.1149/1.2411539
R.DieckmannandH.Schmalzried Ber. Bunsenges. physik. Chem. in print.
10.1524/zpch.1975.96.4-6.331
R.Dieckmann Thesis TU Clausthal1975.
10.1524/zpch.1959.22.3_4.199

Dates

Type	When
Created	12 years, 11 months ago (Sept. 4, 2012, 10:04 a.m.)
Deposited	1 year, 10 months ago (Oct. 19, 2023, 12:41 a.m.)
Indexed	2 weeks, 3 days ago (Aug. 6, 2025, 8:56 a.m.)
Issued	48 years, 5 months ago (March 1, 1977)
Published	48 years, 5 months ago (March 1, 1977)
Published Online	15 years, 3 months ago (May 5, 2010)
Published Print	48 years, 5 months ago (March 1, 1977)

Funders 0

None

BibTeX

@article{Dieckmann_1977, title={Defects and Cation Diffusion in Magnetite (I)}, volume={81}, ISSN={0005-9021}, url={http://dx.doi.org/10.1002/bbpc.19770810320}, DOI={10.1002/bbpc.19770810320}, number={3}, journal={Berichte der Bunsengesellschaft für physikalische Chemie}, publisher={Wiley}, author={Dieckmann, R. and Schmalzried, H.}, year={1977}, month=mar, pages={344–347} }

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  "abstract": "<jats:title>Abstract</jats:title><jats:p>Using radioactive tracer Fe\u201059 and measuring rest activities after sectioning, the tracer diffusivities of Fe in almost single crystalline magnetite Fe<jats:sub>3\u2010\u0394</jats:sub>O<jats:sub>4</jats:sub> have been measured as a function of temperature and oxygen partial pressure. The measured curves log <jats:italic>D</jats:italic><jats:sub>Fe</jats:sub><jats:sup>*</jats:sup>/log <jats:italic>p</jats:italic><jats:sub>O2</jats:sub> all exhibit a minimum in the temperature range between 900\u00b0C and 1400\u00b0C in the homogeneity range of the magnetite. At sufficiently high oxygen partial pressures the slope \u03f1 log <jats:italic>D</jats:italic> <jats:sub>Fe</jats:sub><jats:sup>*</jats:sup>/log <jats:italic>p</jats:italic><jats:sub>O2</jats:sub> is 2/3: at sufficiently low partial pressures it is \u20142/3. This allows to conclude that stoichiometric Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> has a Frenkel disorder in the cationic sublattice, while at high oxygen potentials iron ion vacancies are responsible for the cation deficit. Their electrical charge is balanced by threevalent iron ions.</jats:p>",
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