Direct observation of rough-smooth twin structure in silver halides by high-resolution electron microscopy

Jagannathan, S.; Chen, S.; Mehta, R. V.; Jagannathan, Ramesh

doi:10.1103/physrevb.53.9

Cited by 8 publications

(3 citation statements)

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“…Similar cases have received attention in silver bromides and/or halide crystals. 13,28 Millan et al sliced silver bromide rod crystals and examined their surface/twin structure for the first time. 13 They observed secondary twins in all the rod crystals, and a large fraction of surfaces were bounded by {111} FCC planes.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Revisiting the Twin Plane Re-entrant Edge Growth Mechanism at an Atomic Scale by Electron Microscopy

Zhu

2014

Crystal Growth & Design

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We conducted an extensive electron microscopy study on surface and defect structures of boron suboxide/ suboxycarbide platelets by examining them under various imaging conditions, e.g., side-view and top-view perspectives. It was determined that a twin plane re-entrant edge mechanism was responsible for the growth process at an atomic scale. Moreover, this thorough investigation provided an opportunity to resolve several critical issues regarding this otherwise wellknown growth mechanism for metallic nanostructures. In this study, the platelets contained multiple {001} twin lamellae parallel to basal planes and their side faces were mainly enclosed by {101} facets. Vertical growth was heterogeneously nucleated of {001}-type growth twins that were confined at the corners. In lateral growth, nucleation sites were greatly extended to twin reentrant edges around all side faces. No secondary growth twins were introduced during lateral growth because {101}-type side faces were not twin planes. This work clearly establishes that surface structures of twinned platelets determine nucleation behaviors on basal/side faces and thus control the final morphology, which is relevant to the shape control of metal nanoplates.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Revisiting the Twin Plane Re-entrant Edge Growth Mechanism at an Atomic Scale by Electron Microscopy

Zhu

2014

Crystal Growth & Design

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“…For example, the formation of twin planes determines the equilibrium shapes of small noble metal particles 20,[26][27][28][29][30][31] and is often responsible for the anisotropic growth of plate-like crystals. [32][33][34][35] Probably the most amazing manifestation of the twinning phenomenon is the formation of multiply twinned (MT) particles with decahedral and icosahedral shapes, where multiple twin planes form and intersect in a characteristic manner, resulting in crystals possessing "forbidden" five-fold symmetry elements.…”

Section: Introductionmentioning

confidence: 99%

“…Twinning has been observed in many fcc metals (Au, Ag, Pt, Pd) − along with Si , and diamond. , It should not be considered as simply a crystal imperfection, as it plays an important role in the thermodynamics and kinetics of crystal growth. For example, the formation of twin planes determines the equilibrium shapes of small noble metal particles ,− and is often responsible for the anisotropic growth of plate-like crystals. − Probably the most amazing manifestation of the twinning phenomenon is the formation of multiply twinned (MT) particles with decahedral and icosahedral shapes, where multiple twin planes form and intersect in a characteristic manner, resulting in crystals possessing “forbidden” five-fold symmetry elements.…”

Section: Introductionmentioning

confidence: 99%

Size-Dependent Multiple Twinning in Nanocrystal Superlattices

et al. 2009

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We report a size-dependent change in the morphology of superlattices self-assembled from monodisperse colloidal PbS nanocrystals. Superlattices of large (>7 nm) PbS nanocrystals showed a strong tendency to form multiply twinned face-centered cubic superlattices with decahedral and icosahedral symmetry, exhibiting crystallographically forbidden five-fold symmetry elements. On the other hand, superlattices of small (<4 nm) PbS nanocrystals exhibited no twinning. To explain such a dramatic difference in the twinning probability, we showed that twinning energy in a nanocrystal superlattice is strongly size-dependent. In addition, the interparticle potentials acting during the self-assembly process are "softer" in the case of larger PbS nanocrystals, thus favoring the formation of multiply twinned superlattices. Our work introduces a new class of materials exhibiting multiple twinning, while offering flexibility in designing interparticle potentials.

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