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Redetermination of high-temperature heat capacity of Mg2SiO4 ringwoodite: Measurement and lattice vibrational model calculation

  • Hiroshi Kojitani EMAIL logo , Madoka Oohata , Toru Inoue and Masaki Akaogi
Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 97 Issue 8-9

Abstract

Isobaric heat capacities (CP) of Mg2SiO4 forsterite and ringwoodite were measured by differential scanning calorimetry in the temperature range of 306-833 K. The measured CP of Mg2SiO4 forsterite was consistent with those reported by previous studies. On the other hand, the present CP of Mg2SiO4 ringwoodite was about 3-5% larger than those measured by previous researchers. The calorimetric data of Mg2SiO4 ringwoodite were extrapolated to 2500 K using a lattice vibrational model calculation, which well reproduced the low-temperature CP data measured by thermal relaxation method. The calculated CP shows good agreement with the present calorimetric data. The obtained CP was expressed by the polynomial of temperature: CP = 164.30 + 1.0216 × 10−2T + 7.6665 × 103T−1 - 1.1595 × 107T−2 + 1.3807 × 109T−3 [J/(mol·K)] in the range of 250-2500 K.

Keywords : Mg2SiO4; ringwoodite; heat capacity; DSC; Kieffer model calculation; thermodynamic property; mantle transition zone
Received: 2011-11-17
Accepted: 2012-4-9
Published Online: 2015-4-2
Published in Print: 2012-8-1

© 2015 by Walter de Gruyter Berlin/Boston

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  1. Actinides in Geology, Energy, and the Environment. Petrography and geochronology of the Pele Mountain quartz-pebble conglomerate uranium deposit, Elliot Lake District, Canada
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  5. Redetermination of high-temperature heat capacity of Mg2SiO4 ringwoodite: Measurement and lattice vibrational model calculation
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https://doi.org/10.2138/am.2012.4054
Keywords for this article
Mg2SiO4; ringwoodite; heat capacity; DSC; Kieffer model calculation; thermodynamic property; mantle transition zone

Articles in the same Issue

  1. Actinides in Geology, Energy, and the Environment. Petrography and geochronology of the Pele Mountain quartz-pebble conglomerate uranium deposit, Elliot Lake District, Canada
  2. Celadonite in continental flood basalts of the Columbia River Basalt Group
  3. Thermodynamics of manganese oxides: Effects of particle size and hydration on oxidation-reduction equilibria among hausmannite, bixbyite, and pyrolusite
  4. Grossular: A crystal-chemical, calorimetric, and thermodynamic study
  5. Redetermination of high-temperature heat capacity of Mg2SiO4 ringwoodite: Measurement and lattice vibrational model calculation
  6. Thermal behavior of realgar As4S4, and of arsenolite As2O3 and non-stoichiometric As8S8+x crystals produced from As4S4 melt recrystallization
  7. Thermodynamics of the magnetite-ulvöspinel (Fe3O4-Fe2TiO4) solid solution
  8. Raman spectroscopy of (Ca,Mg)MgSi2O6 clinopyroxenes
  9. In-situ Raman spectroscopic study of sulfur speciation in oxidized magmatic-hydrothermal fluids
  10. Structural anisotropy and annealing-induced nanoscale atomic rearrangements in metamict titanite
  11. Hydrous fluid as the growth media of natural polycrystalline diamond, carbonado: Implication from IR spectra and microtextural observations
  12. Metastable equilibrium in the C-H-O system: Graphite deposition in crustal fluids
  13. Controlled morphogenesis of amorphous silica and its relevance to biosilicification
  14. Structural relaxation in tetrahedrally coordinated Co2+ along the gahnite-Co-aluminate spinel solid solution
  15. Limitations of Fe2+ and Mn2+ site occupancy in tourmaline: Evidence from Fe2+- and Mn2+-rich tourmaline
  16. Isothermal compression of face-centered cubic iron
  17. Bonding and structural changes in siderite at high pressure
  18. Energetics and kinetics of carbonate orientational ordering in vaterite calcium carbonate
  19. Growth process and crystallographic properties of ammonia-induced vaterite
  20. Argesite, (NH4)7Bi3Cl16, a new mineral from La Fossa Crater, Vulcano, Aeolian Islands, Italy: A first example of the [Bi2Cl10]4− anion
  21. Experimental study of mineral equilibria in the system K2O(Li2O)-Al2O3-SiO2-H2O-HF at 300 to 600 °C and 100 MPa with application to natural greisen systems
  22. Tobelite and NH+4-rich muscovite single crystals from Ordovician Armorican sandstones (Brittany, France): Structure and crystal chemistry
  23. The enigmatic iron oxyhydroxysulfate nanomineral schwertmannite: Morphology, structure, and composition
  24. Ferric iron and water incorporation in wadsleyite under hydrous and oxidizing conditions: A XANES, Mössbauer, and SIMS study
  25. Kircherite, a new mineral of the cancrinite-sodalite group with a 36-layer stacking sequence: Occurrence and crystal structure
  26. Molecular models of birnessite and related hydrated layered minerals
  27. Letter: Gold-telluride nanoparticles revealed in arsenic-free pyrite
  28. Letter: XAS evidence for the stability of polytellurides in hydrothermal fluids up to 599 °C, 800 bar
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