On the crystal structure and compressional behavior of talc: a mineral of interest in petrology and material science

Gatta, G. Diego; Merlini, Marco; Valdrè, Giovanni; Liermann, Hanns‐Peter; Nénert, Gwilherm; Rothkirch, André; Kahlenberg, Volker; Pavese, Alessandro

doi:10.1007/s00269-012-0554-4

Cited by 35 publications

(43 citation statements)

References 53 publications

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“…Similar findings were reported by Gatta et al (2013) on the compressional behaviour of talc-1Tc, where ε 3 ∠c = 23.4(6)°.…”

Section: Discussionsupporting

confidence: 89%

“…The previous experiment on the compressional behaviour of talc-1Tc by Gatta et al (2013), coupled with the thermal data obtained in this study, allow a comparative thermo-elastic analysis of the behaviour of pyrophyllite and talc. The EPMA-WDS chemical analysis reveals that the samples of pyrophyllite and talc used in this study approaches the ideal compositions [i.e., (Al The high-pressure data of this study on pyrophyllite-1Tc up to 6.2 GPa leads to: K T0 = 47(3) GPa and K′ = 6.6(14) for the M-EoS fit, K T0 = 54(1) GPa for the II-BM-EoS fit, and K T0 = 47(4) GPa and K′ = 7.3(19) for a III-BM-EoS fit, with the following anisotropic compressional scheme: β a :β b :β c = 1.06:1:4.00.…”

Section: Discussionmentioning

confidence: 98%

“…Electron microprobe analysis of talc in wavelength dispersive mode (EPMA-WDS) was reported by Gatta et al (2013), with the following chemical formula: (Mg 2.93 Fe 0.06 ) Σ2.99 (Al 0.02 Si 3.97 ) Σ3.99 O 10 (OH) 2.10 . EPMA-WDS analysis was performed on several crystals of pyrophyllite (optically free of defects or zoning) using a Jeol JXA-8200 microprobe.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…In the studies previously performed, the polytypic nature of the two phyllosilicates is often not mentioned, and, in addition, the quality of the data is far from the modern standards. Recently, Gatta et al (2013) reinvestigated the crystal structure of the 1Tc (or 1A) polytype of talc by single-crystal X-ray and neutron diffraction and its high-pressure behaviour by in situ single-crystal X-ray diffraction up to 16 GPa, providing also a critical review of the elastic behaviour of talc on the basis of the data previously reported. The experimental findings of Gatta et al (2013) were recently corroborated by quantum mechanical simulations of talc compression up to 10 GPa and second-order elastic constants reported by Ulian et al (2014).…”

Section: Introductionmentioning

confidence: 98%

“…Recently, Gatta et al (2013) reinvestigated the crystal structure of the 1Tc (or 1A) polytype of talc by single-crystal X-ray and neutron diffraction and its high-pressure behaviour by in situ single-crystal X-ray diffraction up to 16 GPa, providing also a critical review of the elastic behaviour of talc on the basis of the data previously reported. The experimental findings of Gatta et al (2013) were recently corroborated by quantum mechanical simulations of talc compression up to 10 GPa and second-order elastic constants reported by Ulian et al (2014). The thermal expansivity of talc was measured by by in situ X-ray powder diffraction (in home-lab) up to 1080 K. The only experimental data on the compressibility of pyrophyllite have been reported by Pawley et al (2002), on the basis of in situ synchrotron energy dispersive powder diffraction in a multi-anvil apparatus collected up to ~6 GPa.…”

Section: Introductionmentioning

confidence: 98%

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Elastic behaviour and phase stability of pyrophyllite and talc at high pressure and temperature

et al. 2014

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versus "normalized stress" leads to: Fe(0) = 47(3) GPa as intercept value and regression line slope with K′ = 7.1(18). A drastic and irreversible change of the thermal behaviour of pyrophyllite-1Tc was observed at 700 < T < 850 K, likely ascribable to the first stage of the T-induced de-hydroxylation. Between 298 and 700 K, the α angle shows a slight decrease whereas the β and γ angles tend to be unaffected in response to the applied temperature; all the unit-cell edges show a monotonic increase. The axial and volume thermal expansion coefficients of pyrophyllite were modelled between 298 and 773 K following the equation α V (T) = α 0 (1 − 10T −1/2 ), with α V298 K = 2.2(2) × 10 −5 K −1 [with V 0 = 424.2(1) Å 3 and α 0 = 5.5(3) × 10 −5 K −1 ] and thermal anisotropic scheme α a :α b :α c = 1.20:1:2.72. By linear regression, we obtained:. The thermal behaviour of talc-1Tc was investigated by in situ synchrotron powder diffraction up to 1,173 K (at room-P) with a furnace. At 423 K, the diffraction pattern was indexable with a monoclinic unit-cell but with a doubling of the c-axis (as expected for the 2M-polytype). At T > 1,123 K, an irreversible transformation occurs, likely ascribable to the first stage of the T-induced de-hydroxylation. Between 423 and 1,123 K, the β angle decreases in response to the applied temperature; all the unit-cell edges show a monotonic increase. The volume expansion coefficient of talc was modelled between 423 and 1,123 K by the linear regression, yielding: V(T)/V 0 = 1 + α 0V ·T = 1 + 2.15(3) × 10 −5 (T − T 0 ). The comparative elastic analysis of pyrophyllite and talc, using the data obtained in this and in previous studies, shows that pyrophyllite is more compressible and more expandable than talc.Abstract The compressional behaviour of (triclinic) pyrophyllite-1Tc was investigated by means of in situ synchrotron single-crystal diffraction up to 6.2 GPa (at room temperature) using a diamond anvil cell. Its thermal behaviour was investigated by in situ synchrotron powder diffraction up to 923 K (at room pressure) with a furnace. No evidence of phase transition has been observed within the pressure range investigated. The α angle decreases whereas the β and γ angles increase with P, with the following linear trends: α(P) = α 0 − 0.203(9)·ΔP, β(P) = β 0 + 0.126(8)·ΔP, and γ(P) = γ 0 + 0.109(5)·ΔP (angles in ° and P in GPa). P-V data fits with isothermal Murnaghan and third-order Birch-Murnaghan Equations of State yield: K T0 = 47(3) GPa and K′ = 6.6(14) for the M-EoS fit, K T0 = 47(4) GPa and K′ = 7.3(19) for a III-BM-EoS fit, with the following anisotropic compressional scheme: β a :β b : β c = 1.06:1:4.00. The evolution of the "Eulerian finite strain"

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“…Similar findings were reported by Gatta et al (2013) on the compressional behaviour of talc-1Tc, where ε 3 ∠c = 23.4(6)°.…”

Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 98%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

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Elastic behaviour and phase stability of pyrophyllite and talc at high pressure and temperature

et al. 2014

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Effect of ultrafine talc on crystallization and end‐use properties of poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate)

Vandewijngaarden

Murariu

Dubois

et al. 2016

J of Applied Polymer Sci

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Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) is a highly versatile polyhydroxyalkanoate. To enhance its slow crystallization, the performance of ultra-fine talc (median diameter of 1 mm) as a nucleating agent is studied. This study focuses on crystallization, but also on the effect on fundamental properties (i.e., thermal stability) and selected end-use properties (i.e., color, opacity, tensile properties, and gas permeability), to assess its applicability for food packaging purposes. Samples containing 0.5, 1, and 2 wt % were prepared through melt blending and compression molding. First, it was proven that ultra-fine talc is a highly performant nucleating agent for PHBHHx. The isothermal crystallization half time at 70 8C was reduced to 97% by adding 2 wt % of talc, which could greatly improve the processability of PHBHHx. Thermal stability increased with 3-4 8C, due to increased barrier effect. Permeability for O 2 , CO 2 , and water vapor increased slightly upon addition of 0.5 wt % and 1 wt % talc, but decreased at 2 wt % talc. Nevertheless, the results remained within the same applicability range. An acceptable total color change of 0.9 was observed. Furthermore, the PHBHHx matrix was rendered stiffer (Young's modulus increased with 100 MPa), while showing hardly any change in elongation at break or tensile strength. Overall, it can be concluded that ultrafine talc is a very efficient nucleating agent for PHBHHx. Besides the beneficial effect on crystallization, the ultrafine talc hardly influenced any other property, which could prove to be of high added value for the application of these composites as food packaging material.

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In‐situRaman study of phengite compressed in water medium under simultaneously highP–Tparameters

Goryaĭnov

Крылов

Polyansky

et al. 2017

J Raman Spectroscopy

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The in‐situ method of Raman spectroscopy was used to study the layered mineral phengite, K(Al,Mg)2(Si,Al)4O10(OH)2, compressed in water under simultaneously high temperatures and pressures (respectively, up to 373 °С and 12.5 GPa). The implemented conditions were typical of modeling the ‘cold’ subduction zones in lithospheric slabs. The high pressures and temperatures were produced in an electrically heated diamond‐anvil cell. Measured Raman spectra have demonstrated a high Р–Т stability of the mineral. No non‐quenchable phengite states (no reversible or irreversible polymorphic transitions, overhydration or notable amorphization) were observed in the investigated samples. Copyright © 2017 John Wiley & Sons, Ltd.

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On the crystal structure and compressional behavior of talc: a mineral of interest in petrology and material science

Abstract: Introduction

Cited by 35 publications

References 53 publications

Elastic behaviour and phase stability of pyrophyllite and talc at high pressure and temperature

Elastic behaviour and phase stability of pyrophyllite and talc at high pressure and temperature

Effect of ultrafine talc on crystallization and end‐use properties of poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate)

In‐situRaman study of phengite compressed in water medium under simultaneously highP–Tparameters

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