Startseite Direct observation of spinodal decomposition in the magnetite-hercynite system by susceptibility measurements and transmission electron microscopy
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Direct observation of spinodal decomposition in the magnetite-hercynite system by susceptibility measurements and transmission electron microscopy

  • Ute Golla-Schindler EMAIL logo , Hugh St.C. O'Neill und Andrew Putnis
Veröffentlicht/Copyright: 28. März 2015
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 90 Heft 8-9

Abstract

The magnetic susceptibility and Curie temperatures Tc have been investigated for a series of synthetic samples with solid-solution compositions ranging from pure magnetite (Fe3O4) to hercynite (FeAl2O4). The determined Tc can be fitted by a straight line, which also fits the theoretical values for these end-members. With increasing hercynite concentration, susceptibility curves for one heating and cooling cycle become irreversible, indicating changes in the structural state of the samples during annealing. These changes occur in specific temperature ranges for each composition. For a sample of composition Mag40Hec60, irreversible changes occurring between about 200 and 300°C are likely due to changes in the cation distribution, whereas above 300°C, compositional Fluctuations due to spinodal decomposition are evident. The exsolution mechanism has been investigated using energy- filtered transmission electron microscopy, which has allowed direct imaging of the compositional Fluctuations consistent with the theoretical predictions of spinodal decomposition

Received: 2004-11-15
Accepted: 2005-4-7
Published Online: 2015-3-28
Published in Print: 2005-8-1

© 2015 by Walter de Gruyter Berlin/Boston

Artikel in diesem Heft

  1. Crystal-size and shape distributions of magnetite from uncultured magnetotactic bacteria as a potential biomarker
  2. Tourmaline-bearing rocks in the Singhbhum shear zone, eastern India: Evidence of boron infiltration during regional metamorphism
  3. High-resolution transmission electron microscopy (HRTEM) study of the 4a and 6a superstructure of bornite Cu5FeS4
  4. Possible Fe/Cu ordering schemes in the 2a superstructure of bornite (Cu5FeS4)
  5. TEM-specimen preparation of cell/mineral interfaces by Focused Ion Beam milling
  6. Direct observation of spinodal decomposition in the magnetite-hercynite system by susceptibility measurements and transmission electron microscopy
  7. Thermodynamics of uranyl minerals: Enthalpies of formation of rutherfordine, UO2CO3, andersonite, Na2CaUO2(CO3)3(H2O)5, and grimselite, K3NaUO2(CO3)3H2O
  8. Mixing and ordering behavior in manganocolumbite-ferrocolumbite solid solution: A single-crystal X-ray diffraction study
  9. Structure change of MgSiO3, MgGeO3, and MgTiO3 ilmenites under compression
  10. Dehydration processes in the meta-autunite group minerals meta-autunite, metasaléeite, and metatorbernite
  11. Investigation of the martensitic-like transformation from Mg2GeO4 olivine to its spinel structure polymorph
  12. A high-temperature diffraction study of the solid solution CaTiOSiO4-CaTiOGeO4
  13. The vibrational spectrum of synthetic hydrogrossular (katoite) Ca3Al2(O4H4)3: A low-temperature IR and Raman spectroscopic study
  14. Structural characterization of biogenic Mn oxides produced in seawater by the marine bacillus sp. strain SG-1
  15. Investigation of smectite hydration properties by modeling experimental X-ray diffraction patterns: Part I. Montmorillonite hydration properties
  16. Synthesis and crystal-chemistry of alkali amphiboles in the system Na2O-MgO-FeO-Fe2O3- SiO2-H2O as a function of fO2
  17. Compositional zoning in sphalerite crystals
  18. Structure and the extent of disorder in quaternary (Ca-Mg and Ca-Na) aluminosilicate glasses and melts
  19. Makarochkinite, Ca2Fe42+Fe3+TiSi4BeAlO20, a new beryllosilicate member of the aenigmatite-sapphirine-surinamite group from the Ilʼmen Mountains (southern Urals), Russia
  20. Formation of lava stalactites in the master tube of the 1792-1793 flow field, Mt. Etna (Italy)
  21. Crystal-size distributions of garnets in metapelites from the northeastern Bushveld contact aureole, South Africa
  22. Early diagenetic origin of Al phosphate-sulfate minerals (woodhouseite and crandallite series) in terrestrial sandstones, Nova Scotia, Canada
  23. Scandium silicates from the Baveno and Cuasso al Monte NYF-granites, Southern Alps (Italy): Mineralogy and genetic inferences
  24. Letter. The effect of Fictive temperature on Al coordination in high-pressure (10 GPa) sodium aluminosilicate glasses
  25. Letter. α-PbO2-type nanophase of TiO2 from coesite-bearing eclogite in the Dabie Mountains, China
  26. Letter. Morphological characteristics of ordered kaolinite: Investigation using electron back-scattered diffraction
https://doi.org/10.2138/am.2005.1849

Artikel in diesem Heft

  1. Crystal-size and shape distributions of magnetite from uncultured magnetotactic bacteria as a potential biomarker
  2. Tourmaline-bearing rocks in the Singhbhum shear zone, eastern India: Evidence of boron infiltration during regional metamorphism
  3. High-resolution transmission electron microscopy (HRTEM) study of the 4a and 6a superstructure of bornite Cu5FeS4
  4. Possible Fe/Cu ordering schemes in the 2a superstructure of bornite (Cu5FeS4)
  5. TEM-specimen preparation of cell/mineral interfaces by Focused Ion Beam milling
  6. Direct observation of spinodal decomposition in the magnetite-hercynite system by susceptibility measurements and transmission electron microscopy
  7. Thermodynamics of uranyl minerals: Enthalpies of formation of rutherfordine, UO2CO3, andersonite, Na2CaUO2(CO3)3(H2O)5, and grimselite, K3NaUO2(CO3)3H2O
  8. Mixing and ordering behavior in manganocolumbite-ferrocolumbite solid solution: A single-crystal X-ray diffraction study
  9. Structure change of MgSiO3, MgGeO3, and MgTiO3 ilmenites under compression
  10. Dehydration processes in the meta-autunite group minerals meta-autunite, metasaléeite, and metatorbernite
  11. Investigation of the martensitic-like transformation from Mg2GeO4 olivine to its spinel structure polymorph
  12. A high-temperature diffraction study of the solid solution CaTiOSiO4-CaTiOGeO4
  13. The vibrational spectrum of synthetic hydrogrossular (katoite) Ca3Al2(O4H4)3: A low-temperature IR and Raman spectroscopic study
  14. Structural characterization of biogenic Mn oxides produced in seawater by the marine bacillus sp. strain SG-1
  15. Investigation of smectite hydration properties by modeling experimental X-ray diffraction patterns: Part I. Montmorillonite hydration properties
  16. Synthesis and crystal-chemistry of alkali amphiboles in the system Na2O-MgO-FeO-Fe2O3- SiO2-H2O as a function of fO2
  17. Compositional zoning in sphalerite crystals
  18. Structure and the extent of disorder in quaternary (Ca-Mg and Ca-Na) aluminosilicate glasses and melts
  19. Makarochkinite, Ca2Fe42+Fe3+TiSi4BeAlO20, a new beryllosilicate member of the aenigmatite-sapphirine-surinamite group from the Ilʼmen Mountains (southern Urals), Russia
  20. Formation of lava stalactites in the master tube of the 1792-1793 flow field, Mt. Etna (Italy)
  21. Crystal-size distributions of garnets in metapelites from the northeastern Bushveld contact aureole, South Africa
  22. Early diagenetic origin of Al phosphate-sulfate minerals (woodhouseite and crandallite series) in terrestrial sandstones, Nova Scotia, Canada
  23. Scandium silicates from the Baveno and Cuasso al Monte NYF-granites, Southern Alps (Italy): Mineralogy and genetic inferences
  24. Letter. The effect of Fictive temperature on Al coordination in high-pressure (10 GPa) sodium aluminosilicate glasses
  25. Letter. α-PbO2-type nanophase of TiO2 from coesite-bearing eclogite in the Dabie Mountains, China
  26. Letter. Morphological characteristics of ordered kaolinite: Investigation using electron back-scattered diffraction
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