Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2361o&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 24, p. 2361-2364.
Physics
6
Aluminum Oxides, Iron Oxides, Magnetite, Magnetostriction, Polycrystals, Strain Gages, Titanium Compounds, Aluminum, Curie Temperature, Hysteresis, Temperature Dependence
Scientific paper
Using the strain gauge technique, the magnetostriction constants lambda have been measured on sintered polycrystalline specimens of titanomagnetites with Fe(2.4-delta)Ti(0.6)Al-(delta)O4 compositions in the temperature range between 25 C and Tc. The cell-edge, saturation magnetization, and Curie temperature decrease with increasing aluminum concentration. The room-temperature lambda-s values are 95.7, 70.6, 52.9 and 25.2 x 10 exp -6 for delta = 0.05, 0.10, 0.15 and 0.20, respectively. A linear relationship is found between the magnetostriction constant and the aluminum content at room temperature. The constant lambda-s(T) is proportional to approximately the third power of the saturation magnetization Ms(T). The values of the index n in lambda-s(T) about Ms exp n(T) are 2.72, 3.16, 3.35, and 3.60 for lambda-s = 0.05, 0.10, 0.15, and 0.2, respectively. This is the first reported measurement of lambda-s(T) at elevated temperatures for Al-substituted titanomagnetites.
Moskowitz Bruce M.
Özdemir Özden
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