| Reference Type | Journal (article/letter/editorial) |
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| Title | Compressibility and thermal expansion of magnesium phosphates |
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| Journal | European Journal of Mineralogy |
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| Authors | Leyx, C. | Author |
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| Schmid-Beurmann, P. | Author |
| Brunet, F. | Author |
| Chopin, C. | Author |
| Lathe, C. | Author |
| Year | 2024 | Volume | < 36 > |
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| Issue | < 3 > |
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| URL | |
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| DOI | doi:10.5194/ejm-36-417-2024Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17385953 | Long-form Identifier | mindat:1:5:17385953:9 |
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| GUID | 0 |
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| Full Reference | 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 doi:10.5194/ejm-36-417-2024 |
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| Plain Text | 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 doi:10.5194/ejm-36-417-2024 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | 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 = “Mg-sarcopside” = [6]Mg3(PO4)2-II), three Mg2PO4OH polymorphs (althausite, hydroxylwagnerite and ε-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 = K−1 for ε-Mg2PO4OH to v1 = K−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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