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Magnetic Behavior of Natural Goethite During Thermal Demagnetization
Author(s) -
Dekkers M. J.
Publication year - 1988
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl015i005p00538
Subject(s) - goethite , hematite , magnetite , remanence , mineralogy , dehydration , geology , demagnetizing field , materials science , chemical engineering , chemistry , magnetization , metallurgy , magnetic field , physics , adsorption , quantum mechanics , biochemistry , engineering
Goethite maximum blocking temperatures (60–105°C) are governed by the amount of isomorphous substitution in the goethite lattice. The goethite dehydration reaction (250–350°C) is attended with a concurrent remanence decrease in finely intergrown hematite due to a change of the original hematite structure promoted by the liberated water vapor. This remanence decrease leads to a bending point in the thermal decay curve, which could be easily mistaken for the presence of another magnetic constituent. The magnetic properties of the minerals formed through goethite dehydration (hematite and traces magnetite) strongly depend on their growth history.