Elasticity of muscovite and its relationship to crystal structure

Vaughan, Michael T.; Guggenheim, Stephen

doi:10.1029/jb091ib05p04657

Cited by 265 publications

(150 citation statements)

References 30 publications

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“…The mean Hertzian contact pressure during loaded scanning in contact mode was 1.6 GPa; this is based on a tip radius of 40 nm from SEM micrographs, a load of 38 nN (cantilever deflection 5 V), Young's moduli of 60 GPa and 280 GPa for mica and silicon nitride respectively and Poisson ratios of 0.25 and 0.20 for mica and silicon nitride respectively [52][53][54][55][56][57][58][59][60]. Interestingly, the fatty acid film was not displaced laterally -there is no evidence of pile up at the edges of the scan, but instead appears to return to solution.…”

Section: Discussionmentioning

confidence: 99%

In Situ Study of Model Organic Friction Modifiers Using Liquid Cell AFM; Saturated and Mono-unsaturated Carboxylic Acids

et al. 2015

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Fatty acids and their derivatives have been used as model organic friction modifiers for almost a century, but there is still debate as to the nature of the boundary films that they form on rubbed surfaces. In this study, in situ liquid cell atomic force microscopy (AFM) is used to monitor the self-assembly of boundary films from solutions of fatty acids in alkanes on to mica surfaces. Because the mica surfaces are wholly immersed in solution it is possible to study directly changes in the morphology and friction of these films over time and during heating and cooling.It has been found that stearic and elaidic acid, that are able to adopt a linear molecular configurations, form irregular islands on mica that are tens to hundreds of microns in diameter and typically 1.6 nm thick, corresponding to domains of tilted single monolayers. At a relatively high concentration of 0.01M, stearic acid in hexadecane forms an almost complete monolayer, but at lower concentrations, in dodecane solution and for elaidic acid solutions these films remain incomplete after prolonged immersion of more than a day. The films formed by fatty acids on mica are displaced by repeated scanning in contact mode AFM but can be imaged without damage using tapping mode AFM.Rubbed quartz surfaces from a sliding ball-on-disc test were also scanned ex-situ using AFM and these showed that stearic acid forms similar monolayer island films on quartz in macroscale friction experiments as are found on mica.Oleic acid solutions behave quite differently from stearic acid and elaidic acid, forming irregular globular films on both mica and rubbed quartz surfaces. This is believed to be because its cis-double bond geometry means that, unlike its trans-isomer elaidic acid or saturated stearic acid, it is unable to adopt a linear molecular configuration and so is less able to form close-packed monolayers.

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Section: Discussionmentioning

confidence: 99%

In Situ Study of Model Organic Friction Modifiers Using Liquid Cell AFM; Saturated and Mono-unsaturated Carboxylic Acids

et al. 2015

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“…Seismic velocities were calculated with the Beartex software (Wenk et al, 1998) using the ODFs obtained from the Rietveld refinement as inputs. Appropriate mineral single-crystal elastic constants were used, namely, biotite (Aleksandrov and Ryzhova, 1961), white mica (Vaughan and Guggenheim, 1986), K-feldspar (Hearmon, 1984;Bass, 1995), albite (Aleksandrov and Ryzhova, 1961) and quartz (Hearmon, 1984). Seismic properties are given as contoured stereographic projections, i.e., the pole figures, of the P-wave velocities (Vp).…”

Section: Seismic Anisotropies From Lpo Datamentioning

confidence: 99%

The 3D quantitative lattice and shape preferred orientation of a mylonitised metagranite from Monte Rosa (Western Alps): Combining neutron diffraction texture analysis and synchrotron X-ray microtomography

Zucali

Voltolini

Ouladdiaf³

et al. 2014

Journal of Structural Geology

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. a b s t r a c tTwo complementary 3D techniques, neutron diffraction and synchrotron X-ray microtomography (SXRmCT), were used to compare the Shape and Lattice Preferred Orientations of a mylonitised metagranite from the Monte Rosa unit (Western Alps, Italy). The goal of using these techniques was to obtain two different orientation distribution functions. Although the two functions describe relatively independent characteristics of the rock fabric, nonetheless they also exhibit close relationships to macroscopic fabrics and may be complementarily used to quantify rock fabrics and microstructures, thereby highlighting 3D features that cannot be obtained with either technique, if used independently. We describe an approach that can be potentially useful in various disciplines, e.g., structural geology, rock mechanics, tectonics and geophysics, when a complete data set of preferred orientations and size distribution is needed. Micas display a strong orthorhombic symmetry between mesoscopic lineation and microscopic SPO and LPO, whereas quartz and feldspars are characterised by a monoclinic symmetry between mesoscopic lineation and LPO. These observations suggest a rheological decoupling between the weak phase mica layers and the stronger quartz þ feldspar layers. This mechanical decoupling occurred during the Alpine subduction-collision, when the Monte Rosa unit was part of the Insubric Line system and accommodated large vertical strain.

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“…For biotite we used constants measured by Vaughan and Guggenheim (1986) on muscovite which shows very close similarity with biotite crys tal structure and elastic properties. These data are indeed more recent and more reliable than those of Aleksandrov and Ryzhova (1961) for the biotite single crystal.…”

Section: Single Crystals S-wave Propertiesmentioning

confidence: 99%

A quantitative evaluation of the contribution of crustal rocks to the shear-wave splitting of teleseismic SKS waves

Barruol

Mainprice

1993

Physics of the Earth and Planetary Interiors

192

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Elasticity of muscovite and its relationship to crystal structure

Cited by 265 publications

References 30 publications

In Situ Study of Model Organic Friction Modifiers Using Liquid Cell AFM; Saturated and Mono-unsaturated Carboxylic Acids

In Situ Study of Model Organic Friction Modifiers Using Liquid Cell AFM; Saturated and Mono-unsaturated Carboxylic Acids

The 3D quantitative lattice and shape preferred orientation of a mylonitised metagranite from Monte Rosa (Western Alps): Combining neutron diffraction texture analysis and synchrotron X-ray microtomography

A quantitative evaluation of the contribution of crustal rocks to the shear-wave splitting of teleseismic SKS waves

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