Solid solutions of (Mg, Fe2+)-cordierite: Synthesis, water content, and magnetic properties

The dependence of water concentration in synthetic (Mg, Fe 2+ )-cordierite on the composition of the solid solution was examined in experiments that lasted for 10 days at = 200–230 MPa, t = 600–700°C, and oxygen fugacity corresponding to the Fe-FeO buffer. Mass spectrometric data indicate that the d...

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Bibliographic Details
Published in:Geochemistry international 2011-04, Vol.49 (4), p.391-406
Main Authors: Bulbak, T. A., Shvedenkova, S. V.
Format: Article
Language:English
Subjects:
Chemical synthesis
Earth and Environmental Science
Earth Sciences
Geochemistry
Magnetic fields
Magnetic properties
Magnetism
Solid solutions
Water
Water content
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Summary:The dependence of water concentration in synthetic (Mg, Fe 2+ )-cordierite on the composition of the solid solution was examined in experiments that lasted for 10 days at = 200–230 MPa, t = 600–700°C, and oxygen fugacity corresponding to the Fe-FeO buffer. Mass spectrometric data indicate that the dependence of water concentration in cordierite on its Fe mole fraction Fe 2+ /(Fe 2+ + Mg) has maxima at compositions with F = 0.2–0.3. IR diffuse reflectance spectroscopic data and data on the structural setting of H 2 O molecules in the structural channels of alkali-free (Mg, Fe 2+ )-cordierite indicate that the H-H vector of some H 2 O molecules (H 2 O-II) is perpendicular to [001] of the crystal. The dependence of the magnetic properties of synthetic (Mg, Fe 2+ )-cordierite was studied by static magnetization technique at 5–300 K in an external magnetic field up to 20 kOe in strength.
ISSN:0016-7029
1556-1968
DOI:10.1134/S0016702911020042