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Effect of pressure on the Curie temperature of titanomagnetites [(1 − x) ·Fe3O4 − x ·TiFe2O4]

1970; Elsevier BV; Volume: 10; Issue: 1 Linguagem: Inglês

10.1016/0012-821x(70)90067-1

1385-013X

A. Schult,

Magnetic Properties of Alloys

The effect of pressure up to 60 kbar on the Curie temperatureTc of titanomagnetites was measured.Tc increases linearly over this range. For magnetite the magnetic Grüneisen parameter γm =d lnTc/d lnV equals about −4±10%.γm increases in magnitude for increasing titanium content with a maximum of γm = −5.1 ± 10%forx ≈ 0.7. This result is consistent with relative strong and positive exchange interactionJBB in the B-sublattice one can deduce from other investigations. It is suggested that a largeJBB makes self-reversal of magnetization unlikely, which is based on a change of the predominant magnetization from one sublattice to the other.