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Order parameter variation through the C2/m-P21/m phase transition in cummingtonite

  • Tiziana Boffa Ballaran EMAIL logo , Michael A. Carpenter and M. Chiara Domeneghetti
Published/Copyright: March 28, 2015
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American Mineralogist
From the journal American Mineralogist Volume 89 Issue 11-12

Abstract

The C2/m-P21/m phase transition in natural cummingtonites, with different compositions, has been investigated by single-crystal X-ray diffraction and powder absorption IR spectroscopy. Variations in the intensity of type b (superlattice) reflections above room temperature are consistent with the transition being thermodynamically continuous and conform to the solution to a 2-4-6 Landau potential. Parameters extracted from IR spectra collected both above and below room temperature suggest that the local structural evolution differs slightly from the average macroscopic behavior observed by X-ray diffraction. Changes in wavenumber of an isolated absorption band at ∼1130 cm-1 and changes in the integrated intensity of a band at ∼760 cm-1 can be described by the solution to a 2-4 Landau potential with saturation below room temperature. Absorption bands due to O-H vibration and libration, however, appear to show discontinuities in the variation of their wavenumbers at the transition point. A local mechanism for the transition might involve a framework distortion providing the main driving force, with coupling to an order-disorder process for the protons

Received: 2004-2-29
Accepted: 2004-4-2
Published Online: 2015-3-28
Published in Print: 2004-11-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2004-11-1218

Articles in the same Issue

  1. First-principle study of polytype structures of 1:1 dioctahedral phyllosilicates
  2. Calorimetry of liquids in the system Na2O-Fe2O3-SiO2
  3. A Mössbauer study of the oxidation state of Fe in silicate melts
  4. Nanometer-scale measurements of Fe3+/ΣFe by electron energy-loss spectroscopy: A cautionary note
  5. The most reduced rock from the moon, Apollo 14 basalt 14053: Its unique features and their origin
  6. Quantitative analysis of ammonium in biotite using infrared spectroscopy
  7. Lizardite-chlorite structural relationships and an inferred high-pressure lizardite polytype
  8. V oxidation state and coordination number in silicate glasses by XAS
  9. Structure of the fluorapatite (100)-water interface by high-resolution X-ray reflectivity
  10. Origin of diffuse superstructure reflections in labuntsovite-group minerals
  11. Isosymmetric structural phase transition of orthoenstatite: Molecular dynamics simulation
  12. Crystal nucleation in hydrous rhyolite: Experimental data applied to classical theory
  13. Investigation of polytypes in lepidolite using electron back-scattered diffraction
  14. Iron partitioning between basaltic melts and clinopyroxene as a function of oxygen fugacity
  15. The synthesis of zeolite-P, Linde Type A, and hydroxysodalite zeolites from paper sludge ash at low temperature (80 °C): Optimal ash-leaching condition for zeolite synthesis
  16. High-pressure viscometry of polymerized silicate melts and limitations of the Eyring equation
  17. Biological control on calcite crystallization: AFM investigation of coccolith polysaccharide function
  18. Order parameter variation through the C2/m-P21/m phase transition in cummingtonite
  19. Arsenate sorption on schwertmannite
  20. Evidence on the structure of synthetic schwertmannite
  21. Crystal-chemical characterization of tourmalines from the English Lake District: Electron-microprobe analyses and Mössbauer spectroscopy
  22. Crystal chemistry and paragenesis of compositionally unique (Al-, Fe-, Nb-, and Zr-rich) titanite from Afrikanda, Russia
  23. Site distribution of Fe2+and Fe3+in the axinite mineral group: New crystal-chemical formula
  24. Epidote-rich talc-kyanite-phengite eclogites, Sulu terrane, eastern China: P-T-fO₂estimates and the significance of the epidote-talc assemblage in eclogite
  25. Quantitative mineralogy of the Yukon River system: Changes with reach and season, and determining sediment provenance
  26. Exsolution of thortveitite, yttrialite, and xenotime during low-temperature recrystallization of zircon from New Caledonia, and their significance for trace element incorporation in zircon
  27. Mineralogical characterization and genesis of hydrothermal Mn oxides from the flank of the Juan the Fuca Ridge
  28. Synchrotron X-ray diffraction study of the structure of shafranovskite, K2Na3(Mn,Fe,Na)4[Si9(O,OH)27](OH)2⋅nH2O, a rare manganese phyllosilicate from the Kola peninsula, Russia
  29. Letter. Coupled cation and oxygen-isotope exchange between alkali feldspar and aqueous chloride solution
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