Twin walls and hierarchical mesoscopic structures

Salje, Ekhard K. H.; Bismayer, U.; Hayward, Steven; Novak, Jurica

doi:10.1180/002646100549300

Cited by 21 publications

(9 citation statements)

References 45 publications

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“…The interfaces are relatively broad rims representing transition areas between such amorphous and crystalline parts of the structure [35]. Investigations of interface phenomena showed their characteristic physical properties and functionalities [47][48][49][50][51]. Hence, radiation induced interfaces in titanite also contribute to the average elastic material behavior.…”

Section: Structural Damage In Titanitementioning

confidence: 97%

Partially amorphous (metamict) titanite: a silicate mineral in a natural radiation induced non-equilibrium phase

Beirau¹

2014

Zeitschrift Für Kristallographie - Crystalline Materials

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The present review will give a brief overview mainly focused on studies during the past 5 years on the mineral titanite (end-member composition CaTiSiO 5 ) which could incorporate radioactive elements in its crystal structure. Aspects of investigations were the structural damage resulting from the radioactive decay, the thermally induced recrystallization process and the elastic properties of the mineral. During the radiation induced damage process, namely the metamictization, titanite becomes partially amorphous with coexisting defect enriched crystalline and aperiodic regions. Within these crystalline regions a P2 1 /c to C2/c phase transition (∼ at 500 K) occurs. Resulting from radiation induced structural damage, titanite shows elastic properties close to those of titanite glass. During recrystallization on annealing an initial softening of the titanite structure takes place (up to temperature ∼950 K) resulting from the formation of soft interfaces. Thermal annealing at higher temperatures leads to increasing structural order and the hardening of the mineral.

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Section: Structural Damage In Titanitementioning

confidence: 97%

Partially amorphous (metamict) titanite: a silicate mineral in a natural radiation induced non-equilibrium phase

Beirau¹

2014

Zeitschrift Für Kristallographie - Crystalline Materials

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“…This definition was chosen in close analogy with the equivalent definitions of ferroelectricity and ferromagneticity [1][2][3][4][5][6][7]. The non-linear relationship between strain and stress is exemplified in the ferroelastic hysteresis.…”

Section: Introductionmentioning

confidence: 99%

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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“…The reorienta-tion of the order parameter between neighbouring domains is considered on an atomic level as dislocations such that the lattices on either side of the wall correspond to each other by a simple rotation referred to a coordinate system linked to the wall (Torres et al, 1982). The walls follow hierarchical patterns discussed by Salje et al (2000). Perpendicular running walls of different type are classi ed by W and W'.…”

Section: Introductionmentioning

confidence: 99%

Ferroelastic orientation states and domain walls in lead phosphate type crystals

et al. 2000

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The monoclinic structural distortion in lead phosphate and lead arsenate is correlated with the ferroelastic phase transition R3̄m → C2/c and R3̄m → P21/c respectively. The resulting domain patterns in the mixed compounds depend on their chemical composition. The intersection of ferroelastic W domain walls with the (100) surface of lead phosphate-arsenate mixed crystals has been imaged using tapping mode atomic force microscopy. Dilution of the strain leads to characteristic surface deformations which deviate from those in pure lead phosphate. In high twinned lead phosphate-arsenate, X-ray diffraction (XRD) was used to show renormalization effects and scattering phenomena stemming from the twin walls. The wall trajectory was found to be independent of chemical variations using transmission electron microscopy.

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Twin walls and hierarchical mesoscopic structures

Cited by 21 publications

References 45 publications

Partially amorphous (metamict) titanite: a silicate mineral in a natural radiation induced non-equilibrium phase

Partially amorphous (metamict) titanite: a silicate mineral in a natural radiation induced non-equilibrium phase

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

Ferroelastic orientation states and domain walls in lead phosphate type crystals

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