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Letter. Cation distribution in MgFe2O4 vs. pressure and temperature: Experiments in a piston-cylinder apparatus

  • Alexander I. Turkin and Valeri A. Drebushchak EMAIL logo
Published/Copyright: March 28, 2015
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American Mineralogist
From the journal American Mineralogist Volume 90 Issue 4

Abstract

The cation distribution in magnesioferrite MgFe2O4 was investigated using a “piston-cylinder” apparatus at three pressures (ambient, 1, and 2 GPa) over a temperature range of 600 to 1200 °C. Quenched samples of magnesioferrite were investigated by X-ray powder diffraction. The inversion parameter was derived from the unit-cell parameter at ambient temperature.

The inversion parameter increases with pressure, being a smooth function of P-T conditions.The changes in the cation distribution in magnesioferrite caused by the changes in P-T conditions produce the contributions to the bulk modulus (<0.01%) and thermal expansion coefficient (12.60%). On average, the pressure increment of 0.01 GPa is compensated for by 1 °C heating.

The effect of pressure on the cation ordering obeys the fundamental relationship (dV/dx)T,P (dx/dP)T < 0. The terms are (dV/dx) < 0 and (dx/dP) > 0 for MgFe2O4 and MgAl2O4.

Received: 2004-5-18
Accepted: 2004-10-29
Published Online: 2015-3-28
Published in Print: 2005-4-1

© 2015 by Walter de Gruyter Berlin/Boston

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  27. Letter. Cation distribution in MgFe2O4 vs. pressure and temperature: Experiments in a piston-cylinder apparatus
https://doi.org/10.2138/am.2005.1714

Articles in the same Issue

  1. Analytical perils (and progress) in electron microprobe trace element analysis applied to geochronology: Background acquisition, interferences, and beam irradiation effects
  2. Contributions to precision and accuracy of monazite microprobe ages
  3. Electron-microprobe age mapping of monazite
  4. Isotopic age constraints from electron microprobe U-Th-Pb dates, using a three-dimensional concordia diagram
  5. Monazite ages in the Chesham Pond Nappe, SW New Hampshire, U.S.A.: Implications for assembly of central New England thrust sheets
  6. Electron-microprobe dating as a tool for determining the closure of Th-U-Pb systems in migmatitic monazites
  7. Comparative isotopic and chemical geochronometry of monazite, with implications for U-Th-Pb dating by electron microprobe: An example from metamorphic rocks of the eastern Wyoming Craton (U.S.A.)
  8. Re-examination of the hydrogarnet structure at high pressure using neutron powder diffraction and infrared spectroscopy
  9. Anomalous elastic behavior and high-pressure structural evolution of zeolite levyne
  10. Crystal chemistry of the hydrothermally synthesized Na2(Mn1-xFex 2+)2Fe3+(PO4)3 alluaudite-type solid solution
  11. Thermodynamic properties of uvarovite garnet (Ca3Cr2Si3O12)
  12. Post-aragonite phase transformation in CaCO3 at 40 GPa
  13. Direct formation of the γ-CaSO4 phase in dehydration process of gypsum: In situ FTIR study
  14. The order-disorder character of FeOHSO4 obtained from the thermal decomposition of metahohmannite, Fe3+2(H2O)4[O(SO4)2]
  15. Temperature and composition dependence of structural phase transitions in Ca(TixZr1-x)OGeO4
  16. Low-T neutron powder-diffraction and synchrotron-radiation IR study of synthetic amphibole Na(NaMg)Mg5Si8O22(OH)2
  17. Charge contrast imaging of fine-scale microstructure and compositional variation in garnet using the environmental scanning electron microscope
  18. Piston-cylinder experiments on H2O undersaturated Fe-bearing systems: An experimental setup approaching fO₂ conditions of natural calc-alkaline magmas
  19. Environmentally important, poorly crystalline Fe/Mn hydrous oxides: Ferrihydrite and a possibly new vernadite-like mineral from the Clark Fork River Superfund Complex
  20. The true structure of wonesite, an interlayer-deficient trioctahedral sodium mica
  21. Clinoholmquistite discredited: The new amphibole end-member fluoro-sodic-pedrizite
  22. XRMapAnal: A program for analysis of quantitative X-ray maps
  23. Letter. Growth zoning and strain patterns inside diamond crystals as revealed by Raman maps
  24. Letter. Differentiation of commercial vermiculite based on statistical analysis of bulk chemical data: Fingerprinting vermiculite from Libby, Montana U.S.A.
  25. Letter. Crystal structure of single-crystal CaGeO3 tetragonal garnet synthesized at 3 GPa and 1000 °C
  26. Letter. Iron isotope exchange kinetics at the nanoparticulate ferrihydrite surface
  27. Letter. Cation distribution in MgFe2O4 vs. pressure and temperature: Experiments in a piston-cylinder apparatus
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