Diffusion-controlled crack propagation in alkali feldspar

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Diffusion-controlled crack propagation in alkali feldspar. / Petrishcheva, E.; Rieder, M; Predan, Jozef et al.
In: Physics and Chemistry of Minerals, Vol. 46.2019, No. 1, 2019, p. 15-26.

Research output: Contribution to journalArticleResearchpeer-review

Harvard

Petrishcheva, E, Rieder, M, Predan, J, Fischer, F-D, Giester, G & Abart, R 2019, 'Diffusion-controlled crack propagation in alkali feldspar', Physics and Chemistry of Minerals, vol. 46.2019, no. 1, pp. 15-26. https://doi.org/10.1007/s00269-018-0983-9

APA

Petrishcheva, E., Rieder, M., Predan, J., Fischer, F.-D., Giester, G., & Abart, R. (2019). Diffusion-controlled crack propagation in alkali feldspar. Physics and Chemistry of Minerals, 46.2019(1), 15-26. https://doi.org/10.1007/s00269-018-0983-9

Vancouver

Petrishcheva E, Rieder M, Predan J, Fischer FD, Giester G, Abart R. Diffusion-controlled crack propagation in alkali feldspar. Physics and Chemistry of Minerals. 2019;46.2019(1):15-26. doi: 10.1007/s00269-018-0983-9

Author

Petrishcheva, E. ; Rieder, M ; Predan, Jozef et al. / Diffusion-controlled crack propagation in alkali feldspar. In: Physics and Chemistry of Minerals. 2019 ; Vol. 46.2019, No. 1. pp. 15-26.

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@article{9e82cd3f68a94083a8a8a490e3504961,
title = "Diffusion-controlled crack propagation in alkali feldspar",
abstract = "The chemically driven propagation of interacting parallel cracks in monoclinic alkali feldspar was studied experimentally. Single crystals of potassium-rich gem-quality sanidine were shifted towards more sodium-rich compositions by cation exchange with a NaCl–KCl salt melt at a temperature of 850∘C and close to ambient pressure. Initially, a zone with elevated sodium content formed at the crystal surfaces due to the simultaneous in-diffusion of sodium and out-diffusion of potassium, where the rate of cation exchange was controlled by sodium–potassium interdiffusion within the feldspar. A chemical shift of potassium-rich alkali feldspar towards more sodium-rich compositions produces highly anisotropic contraction of the crystal lattice. This induced a tensile stress state in the sodium-rich surface layer of the crystals, which triggered the formation of a system of nearly equi-spaced parallel cracks oriented approximately perpendicular to the direction of maximum shortening. Crack propagation following their nucleation was driven by cation exchange occurring along the crack flanks and was controlled by the intimate coupling of the diffusion-mediated build-up of a tensile stress state around the crack tips and stress release by successive crack propagation. The critical energy release rate of fracturing was determined as 1.8–2.2 Jm-2 from evaluation of the near-tip J-integral. The mechanism of diffusion-controlled crack propagation is discussed in the context of high-temperature feldspar alteration.",
author = "E. Petrishcheva and M Rieder and Jozef Predan and Franz-Dieter Fischer and Gerald Giester and Rainer Abart",
year = "2019",
doi = "10.1007/s00269-018-0983-9",
language = "English",
volume = "46.2019",
pages = "15--26",
journal = "Physics and Chemistry of Minerals",
issn = "0342-1791",
publisher = "Springer Berlin",
number = "1",

}

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TY - JOUR

T1 - Diffusion-controlled crack propagation in alkali feldspar

AU - Petrishcheva, E.

AU - Rieder, M

AU - Predan, Jozef

AU - Fischer, Franz-Dieter

AU - Giester, Gerald

AU - Abart, Rainer

PY - 2019

Y1 - 2019

N2 - The chemically driven propagation of interacting parallel cracks in monoclinic alkali feldspar was studied experimentally. Single crystals of potassium-rich gem-quality sanidine were shifted towards more sodium-rich compositions by cation exchange with a NaCl–KCl salt melt at a temperature of 850∘C and close to ambient pressure. Initially, a zone with elevated sodium content formed at the crystal surfaces due to the simultaneous in-diffusion of sodium and out-diffusion of potassium, where the rate of cation exchange was controlled by sodium–potassium interdiffusion within the feldspar. A chemical shift of potassium-rich alkali feldspar towards more sodium-rich compositions produces highly anisotropic contraction of the crystal lattice. This induced a tensile stress state in the sodium-rich surface layer of the crystals, which triggered the formation of a system of nearly equi-spaced parallel cracks oriented approximately perpendicular to the direction of maximum shortening. Crack propagation following their nucleation was driven by cation exchange occurring along the crack flanks and was controlled by the intimate coupling of the diffusion-mediated build-up of a tensile stress state around the crack tips and stress release by successive crack propagation. The critical energy release rate of fracturing was determined as 1.8–2.2 Jm-2 from evaluation of the near-tip J-integral. The mechanism of diffusion-controlled crack propagation is discussed in the context of high-temperature feldspar alteration.

AB - The chemically driven propagation of interacting parallel cracks in monoclinic alkali feldspar was studied experimentally. Single crystals of potassium-rich gem-quality sanidine were shifted towards more sodium-rich compositions by cation exchange with a NaCl–KCl salt melt at a temperature of 850∘C and close to ambient pressure. Initially, a zone with elevated sodium content formed at the crystal surfaces due to the simultaneous in-diffusion of sodium and out-diffusion of potassium, where the rate of cation exchange was controlled by sodium–potassium interdiffusion within the feldspar. A chemical shift of potassium-rich alkali feldspar towards more sodium-rich compositions produces highly anisotropic contraction of the crystal lattice. This induced a tensile stress state in the sodium-rich surface layer of the crystals, which triggered the formation of a system of nearly equi-spaced parallel cracks oriented approximately perpendicular to the direction of maximum shortening. Crack propagation following their nucleation was driven by cation exchange occurring along the crack flanks and was controlled by the intimate coupling of the diffusion-mediated build-up of a tensile stress state around the crack tips and stress release by successive crack propagation. The critical energy release rate of fracturing was determined as 1.8–2.2 Jm-2 from evaluation of the near-tip J-integral. The mechanism of diffusion-controlled crack propagation is discussed in the context of high-temperature feldspar alteration.

UR - http://www.scopus.com/inward/record.url?scp=85049587973&partnerID=8YFLogxK

U2 - 10.1007/s00269-018-0983-9

DO - 10.1007/s00269-018-0983-9

M3 - Article

VL - 46.2019

SP - 15

EP - 26

JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

SN - 0342-1791

IS - 1

ER -