Stress anisotropy in Ti-rich titanomagnetites

Details Stress anisotropy in Ti-rich titanomagnetites Stress anisotropy in Ti-rich titanomagnetites

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...46..233a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 46, Issue 1-3, p. 233-240.

Physics

25

Scientific paper

Domain patterns on Ti-rich titanomagnetites (TMs) show a typically uniaxial anisotropy very similar to those of amorphous metals. They can be interpreted as caused by locally variable compressive and tensional internal stress. The average stress anisotropy energy Eσ = 0.24 . 104 J m-3 (0.24 . 105 erg cm-3), the average internal stress σi = 48 MPa (480 bar) and an effective anisotropy constant Ki = 0.5 . 104 J m-3 (local internal anisotropy energy Ei = Ki sin2 φ) of naturally occurring TMs in basalts have been calculated from the reversible magnetization work Urev. Eσ is approximately 4 to 5 times higher than the average magnetocrystalline anisotropy energy EK in basalts. σi seems to increase with the oxidation parameter z up to a maximum and to decrease with further oxidation.

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