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  Compressibility and thermal expansion of magnesium phosphates

Leyx, C., Schmid-Beurmann, P., Brunet, F., Chopin, C., Lathe, C. (2024): Compressibility and thermal expansion of magnesium phosphates. - European Journal of Mineralogy, 36, 3, 417-431.
https://doi.org/10.5194/ejm-36-417-2024

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Leyx, Catherine1, Author
Schmid-Beurmann, Peter1, Author
Brunet, Fabrice1, Author
Chopin, Christian1, Author
Lathe, Christian2, Author              
Affiliations:
1External Organizations, ou_persistent22              
23.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146036              

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 Abstract: The ambient-temperature compressibility and room-pressure thermal expansion of two Mg3(PO4)2 polymorphs (farringtonite=Mg3(PO4)2-I, with 5- and 6-fold coordinated Mg, and chopinite=“Mgsarcopside”=[6]Mg3(PO4)2-II), three Mg2PO4OH polymorphs (althausite, hydroxylwagnerite and ɛ- Mg2PO4OH, all with [5]Mg and [6]Mg) and phosphoellenbergerite ([6]Mg) were measured on synthetic powders using a synchrotron-based multi-anvil apparatus to 5.5 GPa and a laboratory high-temperature diffractometer, with whole-pattern fitting procedures. Bulk moduli range from 64.5 GPa for althausite to 88.4 GPa for hydroxylwagnerite, the high-pressure Mg2PO4OH polymorph. Chopinite, based on an olivine structure with ordered octahedral vacancies (K0=81.6 GPa), and phosphoellenbergerite, composed of chains of face-sharing octahedra (K0=86.4 GPa), are distinctly more compressible than their homeotypical silicate (127 and 133 GPa, respectively). The compressibility anisotropy is the highest for chopinite and the lowest for phosphoellenbergerite. First-order parameters of quadratic thermal expansions range from v1=2.19x10-5K-1 for ɛ-Mg2PO4OH to v1=3.58x10-5K-1 for althausite. Phosphates have higher thermal-expansion coefficients than the homeotypical silicates. Thermal anisotropy is the highest for farringtonite and the lowest for hydroxylwagnerite and chopinite. These results set the stage for a thermodynamic handling of phase-equilibrium data obtained up to 3 GPa and 1000°C in the MgO–P2O5–H2O and MgO–Al2O3–P2O5–H2O systems.

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Language(s): eng - English
 Dates: 2024-05-172024
 Publication Status: Finally published
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 Identifiers: DOI: 10.5194/ejm-36-417-2024
GFZPOF: p4 T3 Restless Earth
OATYPE: Gold Open Access
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Title: European Journal of Mineralogy
Source Genre: Journal, SCI, Scopus, oa
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Pages: - Volume / Issue: 36 (3) Sequence Number: - Start / End Page: 417 - 431 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals137
Publisher: Copernicus