Elastic properties and stability of coexisting 3T and 2M1 phengite polytypes

Nadia Curetti; Davide Levy; Alessandro Paverse; Gabriella Ivaldi

doi:10.1007/s00269-005-0044-z

Elastic properties and stability of coexisting 3T and 2M₁ phengite polytypes

Nadia Curetti
, Davide Levy
, Alessandro Paverse
, Gabriella Ivaldi

University of Turin
National Research Council of Italy
University of Milan

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

The elastic properties of coexisting natural 3T and 2M₁ phengite samples (Cima Pal, Sesia Zone; Val Savenca; Western Alps, Italy) with similar chemical compositions have been studied by room temperature-high pressure powder diffraction, using synchrotron radiation on the ID9A beam-line at ESRF (Grenoble, France). The P-V curves have been modelled by the Birch-Murnaghan model; a third-order expansion fitted to the experimental data yields for 3T and 2M₁ K₀ = 60.4(± 0.7) GPa, K′ = 5.79(± 0.11) at V₀ = 703.8851 Å³, and K′ = 57.3(± 1.0) GPa, K′ = 6.97(± 0.24) at V₀ = 938.8815 Å³, respectively. The relative stability of 3T vs. 2M₁ has been explored as a function of pressure and temperature in terms of configuration and deformation contributions to the Gibbs energy, using the elastic properties determined here and other thermodynamic parameters from earlier investigations. The results presented agree with the hypothesis of stability of the 3T polytype in the high pressure regime.

Original language	English
Pages (from-to)	670-678
Number of pages	9
Journal	Physics and Chemistry of Minerals
Volume	32
Issue number	10
DOIs	https://doi.org/10.1007/s00269-005-0044-z
State	Published - Jan 2006
Externally published	Yes

Keywords

2M-3T phengites
P-V EoS
Relativestability

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title = "Elastic properties and stability of coexisting 3T and 2M1 phengite polytypes",

abstract = "The elastic properties of coexisting natural 3T and 2M1 phengite samples (Cima Pal, Sesia Zone; Val Savenca; Western Alps, Italy) with similar chemical compositions have been studied by room temperature-high pressure powder diffraction, using synchrotron radiation on the ID9A beam-line at ESRF (Grenoble, France). The P-V curves have been modelled by the Birch-Murnaghan model; a third-order expansion fitted to the experimental data yields for 3T and 2M1 K0 = 60.4(± 0.7) GPa, K′ = 5.79(± 0.11) at V0 = 703.8851 {\AA}3, and K′ = 57.3(± 1.0) GPa, K′ = 6.97(± 0.24) at V0 = 938.8815 {\AA}3, respectively. The relative stability of 3T vs. 2M1 has been explored as a function of pressure and temperature in terms of configuration and deformation contributions to the Gibbs energy, using the elastic properties determined here and other thermodynamic parameters from earlier investigations. The results presented agree with the hypothesis of stability of the 3T polytype in the high pressure regime.",

keywords = "2M-3T phengites, P-V EoS, Relativestability",

author = "Nadia Curetti and Davide Levy and Alessandro Paverse and Gabriella Ivaldi",

year = "2006",

month = jan,

doi = "10.1007/s00269-005-0044-z",

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T1 - Elastic properties and stability of coexisting 3T and 2M1 phengite polytypes

AU - Curetti, Nadia

AU - Levy, Davide

AU - Paverse, Alessandro

AU - Ivaldi, Gabriella

PY - 2006/1

Y1 - 2006/1

N2 - The elastic properties of coexisting natural 3T and 2M1 phengite samples (Cima Pal, Sesia Zone; Val Savenca; Western Alps, Italy) with similar chemical compositions have been studied by room temperature-high pressure powder diffraction, using synchrotron radiation on the ID9A beam-line at ESRF (Grenoble, France). The P-V curves have been modelled by the Birch-Murnaghan model; a third-order expansion fitted to the experimental data yields for 3T and 2M1 K0 = 60.4(± 0.7) GPa, K′ = 5.79(± 0.11) at V0 = 703.8851 Å3, and K′ = 57.3(± 1.0) GPa, K′ = 6.97(± 0.24) at V0 = 938.8815 Å3, respectively. The relative stability of 3T vs. 2M1 has been explored as a function of pressure and temperature in terms of configuration and deformation contributions to the Gibbs energy, using the elastic properties determined here and other thermodynamic parameters from earlier investigations. The results presented agree with the hypothesis of stability of the 3T polytype in the high pressure regime.

AB - The elastic properties of coexisting natural 3T and 2M1 phengite samples (Cima Pal, Sesia Zone; Val Savenca; Western Alps, Italy) with similar chemical compositions have been studied by room temperature-high pressure powder diffraction, using synchrotron radiation on the ID9A beam-line at ESRF (Grenoble, France). The P-V curves have been modelled by the Birch-Murnaghan model; a third-order expansion fitted to the experimental data yields for 3T and 2M1 K0 = 60.4(± 0.7) GPa, K′ = 5.79(± 0.11) at V0 = 703.8851 Å3, and K′ = 57.3(± 1.0) GPa, K′ = 6.97(± 0.24) at V0 = 938.8815 Å3, respectively. The relative stability of 3T vs. 2M1 has been explored as a function of pressure and temperature in terms of configuration and deformation contributions to the Gibbs energy, using the elastic properties determined here and other thermodynamic parameters from earlier investigations. The results presented agree with the hypothesis of stability of the 3T polytype in the high pressure regime.

KW - 2M-3T phengites

KW - P-V EoS

KW - Relativestability

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SN - 0342-1791

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JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

IS - 10

ER -

Elastic properties and stability of coexisting 3T and 2M₁ phengite polytypes

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