Control of Electrical Twinning in Quartz
TL;DR: In the Dauphine twins of quartz, the polarity of the electric axes is reversed on either side of a twin boundary as mentioned in this paper, which is known as electrical twinning and can be induced either by heating or by pressure.
Abstract: IN the Dauphine twins of quartz, the polarity of the electric axes is reversed on either side of a twin boundary. Structurally the change is slight. It has been known for some time that electrical twinning could be induced either by heating1 or by pressure2; but up to the present its elimination has not, so far as we are aware, been reported.
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TL;DR: The Cauchy-Born rule as mentioned in this paper has been widely used in the literature to relate continuum theories of elastic phenomena to typical atomic or molecular theories, and it has been used to correlate changes in positions of the entities in the latter with descriptions of deformation in the former.
Abstract: To relate continuum theories of elastic phenomena to typical atomic or molecular theories, one needs some way of correlating changes in positions of the entities in the latter with descriptions of deformation used in the former. For crystals, the most commonly used bridge used for this is the Cauchy—Born rule. In recent years, there has been a flurry of activity aimed at better understanding it and in trying to generalize it. I will describe and comment on important ideas that have been generated, point out some successes and failures of the rule and indicate kinds of applications that have motivated such work.
187 citations
Cites background from "Control of Electrical Twinning in Q..."
...The Woosters did a linear elastic analysis involving a double-valued strain energy function, finding that certain kinds of shear stresses should be effective in eliminating the twins, leading to a good treatment....
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...An early study of this occurred during World War 2, by Wooster and Wooster [29, 30]....
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TL;DR: In this paper, the main concepts used in the description of ferroelasticity and other related properties of crystals, viz. ferrobielasticity, ferro-astoelectricity and ferromagneto-elastic properties, are reviewed.
Abstract: This article reviews at an introductory level the main concepts used in the description of ferroelasticity and other related properties of crystals, viz. ferrobielasticity, ferroelastoelectricity, ferromagnetoelasticity, ferrotrielasticity, and ferrogyrotropy. The symmetry and phase-transition aspects of these properties are emphasized; these aspects also form the basis for understanding the domain structure of these crystals. The relationship between ferroelastic transitions and martensitic transitions is explored. A brief discussion of the existing and potential applications of ferroelastic and related materials is also included.
145 citations
03 Nov 2006
TL;DR: In this paper, the authors investigated texture development in fine-grained quartz rock novaculite with no initial texture using compression experiments conducted in the Paterson gas apparatus to explore the influence of stress and temperature.
Abstract: Mechanical Dauphine twinning in quartz has been of long-standing interest, both in single crystals and polycrystalline aggregates. This study investigates texture development in fine-grained quartz rock novaculite with no initial texture using compression experiments conducted in the Paterson gas apparatus to explore the influence of stress and temperature. Texture patterns are measured with time-of-flight neutron diffraction and hard synchrotron X-rays, analyzing diffraction data with the Rietveld method. Similar texture patterns are observed as described previously but the new results establish a profound influence of temperature and document that twinning initiates at stresses less than 50 MPa. Possibilities of using Dauphine twinning as a paleopiezometer in quartz-bearing rocks are discussed.
43 citations
Cites background from "Control of Electrical Twinning in Q..."
...At least for single crystals it appears that twinning is almost instantaneous (Schubnikov and Zinserling 1932; Wooster and Wooster 1946)....
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...nikov and Zinserling (1932) showed that twinning was activated instantaneously and this was later confirmed (Wooster and Wooster 1946)....
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TL;DR: In this paper, the preferred orientation of granitic mylonites from the Santa Rosa mylonite zone in Southern California is investigated with time-of-flight neutron diffraction.
39 citations
Cites background from "Control of Electrical Twinning in Q..."
...Dauphiné twinning is also called electrical twinning for its effect on piezoelectric properties (Wooster and Wooster, 1946)....
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...Dauphiné twinning is also called electrical twinning for its effect on piezoelectric properties (Wooster and Wooster, 1946)....
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01 Jan 1987
TL;DR: In this article, the authors compare the behavior of phase transformations with a minimum free energy calculation in the spirit of Gibbs, and find that only one configuration minimizes what is thought to be the appropriate free energy.
Abstract: In phase transformations, metastability is associated with a transformation temperature on heating which differs from the transformation temperature on cooling. The phenomenon is especially prevalent in solids. From an intuitive point of view, the failure of the body to be “absolutely stable” is a consequence of the observation that at a given temperature and pressure, which would ordinarily cause the body to adopt a well-determined configuration, more than one configuration is observed. If we compare this behavior with, say, a minimum free energy calculation in the spirit of Gibbs, we find that only one configuration minimizes what is thought to be the appropriate free energy.
36 citations