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Fe3O4

Spinel structure (magnetite)

 

Xa calculations: Phys. Rev. B17, 484 (1978)

 

Phase transition:

T=850K ® ferromagnetic order

T=122K ® Verwey transition with charge ordering of Fe2+, Fe3+. Several models. See eg. Phys. Rev. B14, 200 (1976)

 

r = 4.81 g/cm3 (variable) cited in Physical Acoustics VIB 419

 

Sound velocities: 4.07-4.34 (l), and 2.09-2.25 (t) *105 cm/sec.

Ref.: Geophys. 28, 658 (1963)

Pressure dependencies of l-waves 431

 

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