Thickness of pericline twin walls in anorthoclase: an X-ray diffraction study

Hayward, Steven; Chrosch, J.; Salje, Ekhard K. H.; Carpenter, Michael A.

doi:10.1127/ejm/8/6/1301

Cited by 51 publications

(38 citation statements)

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“…The atomic mechanisms responsible for this twin memory may be investigated by studying the annealing regimes required to remove the memory effect; how long must a sample be annealed, and at what temperature, to induce 'twin amnesia'. The memory effect stems in this case from partial ordering of Al, Si and the local distribution of Na and K. These local chemical changes represent o/d processes and are thermally activated [40]. This pattern represents a twin structure relatively close to equilibrium although the loci of the walls are mainly determined by the o/d component.…”

Section: Front Propagation In Order/disorder Systems With Partially Cmentioning

confidence: 96%

“…The accepted explanation for this behaviour is that while the front will underlie an accelerated movement with a small Doring mass [37], the emission of phonons and the local stop-and-go movement of the wall with respect to defects will lead on larger time and length scales to a momentum-driven propagation rather than an accelerated movement. Some clarification of this idea emerged when it became clear that the Peierls effect of lattice pinning does not lead to much interaction with moving ferroelastic domain boundaries with large-wall thicknesses (some lattice units) [38][39][40] so that the pinning defects are not related to the discreet nature of the crystal lattices but are generally envisaged to be extrinsic. This would mean that rather defect free ferroelastics, such as SrTiO 3 , could see accelerated domain wall movement rather than ballistic movement,…”

Section: Introductionmentioning

confidence: 97%

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On the dynamics of ferroelastic domain boundaries under thermal and elastic forcing

Salje

2010

Phase Transitions

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Experimental observations and some theoretical models for the propagation of ferroelastic domain boundaries and phase fronts are reviewed. While the static configurations of domains and domain walls are reasonably well understood in ferroelastics (and specifically in shape memory alloys), one finds that the dynamic features have been less thoroughly investigated. In most cases, a smooth movement of domain walls in the ballistic limit is observed, accelerated propagation seems not to exist in the time and space limits of most experiments. Pattern formation occurs when the local order parameter is conserved over a length scale which is different from the ferroelastic correlation length. Currently, only few spiky elastic measurements and domain wall jamming in ferroelastics have been reported. Emphasis is given to disordered systems in which the occurrence of 'jerky elasticity' can be expected.

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Section: Front Propagation In Order/disorder Systems With Partially Cmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

On the dynamics of ferroelastic domain boundaries under thermal and elastic forcing

Salje

2010

Phase Transitions

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“…6(a)-(c). On the basis of line broadening alone, the pyrope-almandine solid solution would appear to be ideal Newton et al, 1977;Geiger er al., 1987). Pyrope-almandine shows linear behaviour in (a) and (d), consistent with ideal mixing.…”

Section: )mentioning

confidence: 98%

Microscopic strain, local structural heterogeneity and the energetics of silicate solid solutions

1999

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Evidence for the existence and scale of local microscopic strains in silicate minerals is reviewed. From the compositional limit of the plateau for the monoclinic + triclinic phase transition in alkali feldspars, the mjcroscopic strain fields around impurity atoms in framework silicates can be -20-40A in diameter. This dimension fails within the characteristic length scale of phonons in these materials, and phonon spectra should therefore be particularly sensitive to the extent and magnitude of local elastic strain effects. The most prominent feature is expected to be broadening of absorption peaks, which can now be followed quantitatively in complex spectra by autocorrelation analysis. Such strain fields contribute elastic energy to the enthalpy of a crystal and might be expected to be largely responsible for enthalpy changes accompanying cation ordering processes and solid solution formation. Comparisons of line broadening data from powder 1R absorption spectra with calorimetric determinations of enthalpy for selected mineral systems confirm a close relationship between local structural heterogeneity and enthalpy variations.

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“…There are few experimental observations which confirm these results; probably the most extensive study is by Chrosch and Salje [77] who measured the wall thickness in LaAlO 3 as a function of temperature over a very large temperature interval [78][79][80][81][82][83][84][85][86][87].…”

Section: Structural Modifications Of Twin Walls: the Role Of The Secomentioning

confidence: 68%

Domain boundary engineering

2009

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Thickness of pericline twin walls in anorthoclase: an X-ray diffraction study

Cited by 51 publications

References 0 publications

On the dynamics of ferroelastic domain boundaries under thermal and elastic forcing

On the dynamics of ferroelastic domain boundaries under thermal and elastic forcing

Microscopic strain, local structural heterogeneity and the energetics of silicate solid solutions

Domain boundary engineering

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