The equation of state of wadsleyite solid solutions: Constraining the effects of anisotropy and crystal chemistry

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Marco E. Ciriotti
Messaggi: 23569
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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The equation of state of wadsleyite solid solutions: Constraining the effects of anisotropy and crystal chemistry

Messaggio da Marco E. Ciriotti » gio 31 ago, 2017 7:10

Prossima pubblicazione.

Referenza:
▪ Buchen, J., Marquardt, H., Boffa Ballaran, T., Kawazoe, T., McCammon, C. (2017): The equation of state of wadsleyite solid solutions: Constraining the effects of anisotropy and crystal chemistry. American Mineralogist, 102, (in press).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

Avatar utente
Marco E. Ciriotti
Messaggi: 23569
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: The equation of state of wadsleyite solid solutions: Constraining the effects of anisotropy and crystal chemistry

Messaggio da Marco E. Ciriotti » gio 07 dic, 2017 11:41

Pubblicazione avvenuta.

Referenza:
▪ Buchen, J., Marquardt, H., Boffa Ballaran, T., Kawazoe, T., McCammon, C. (2017): The equation of state of wadsleyite solid solutions: Constraining the effects of anisotropy and crystal chemistry. American Mineralogist, 102, 2494–2504.

Abstract:
A quantitative knowledge of the equation of state of wadsleyite solid solutions is needed to refine thermodynamic and thermoelastic models for the transition zone in Earth’s upper mantle. Here we present the results of high-pressure single-crystal X‑ray diffraction experiments on two crystals of slightly hydrous iron-bearing wadsleyite with Fe/(Mg+Fe) = 0.112(2), Fe3+/SFe = 0.15(3), and 0.24(2) wt% H2O up to 20 GPa. By compressing two wadsleyite crystal sections inside the same diamond-anvil cell, we find a negligible influence of crystal orientation on the derived equation of state parameters. Volume and linear compression curves were analyzed with finite strain theory to demonstrate their mutual consistency for the Reuss bound indicating quasi-hydrostatic stress conditions. The results on the here-studied wadsleyite crystals are incorporated into a multi-end-member model to describe the equation of state for wadsleyite solid solutions in the system Mg2SiO4-Fe2SiO4-MgH2SiO4-Fe3O4. For the hypothetical ferrous wadsleyite end-member, Fe2SiO4, we find a substantially larger bulk modulus than expected by extrapolating currently accepted trends. The multi-end-member equation of state model may serve as a basis for the calculation of phase equilibria and the interpretation of seismic observations regarding the transition zone.
Marco E. Ciriotti

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