Re-entrant corner mechanism of fcc crystal growth of a-type twin lamella: the Monte-Carlo simulation approach

Li, Hua; Peng, Xingdong; Ming, Nai‐Ben

doi:10.1016/0022-0248(94)90037-x

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…Evidence is mainly based on the observed [6,7,19,26] and simulated [8,29] effect of surface grooves on the rate of surface nucleation and growth, and on the observation [11] that this type of nucleation preserves the stacking-order. The requirement to have such grooves on all close-packed faces (resulting in the cross-twinning model) is a direct consequence of extending the essentially two-dimensional observed growth effects into three dimensions.…”

Section: Discussionmentioning

confidence: 99%

Cross-twinning model of fcc crystal growth

Waal

1996

Journal of Crystal Growth

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The theory developed in 1960 by Wagner, Hamilton and Seidensticker (WHS-theory) to explain observed crystal growth phenomena in Ge is critically reviewed and shown to be capable of explaining preservation of ABC stacking order in two dimensions in fcc crystals of effectively spherical closed shell molecules. In order to preserve this stacking order in all directions, i.e. to explain isotropic three-dimensional fcc crystal growth, the WHS-model is extended to contain at least two (crossing) twin lamellae, rather than one. The implications for the atomic arrangement in the crossing region are examined, with the main result that local fivefold symmetry is to be expected. This is related to the frequent observation of multiply twinned particles (MTPs), exhibiting fivefold symmetry, of fcc materials whose preference for fcc over hcp cannot be explained satisfactorily. Accordingly, it is proposed to view the atomic arrangement in the crossing region not as a result of cross-twinning, but rather as its origin, i.e. to think of fcc crystal growth as a process starting with the coalescence or intergrowth of decahedra with fivefold symmetry. Experimental evidence in support of this model is given. A possible implication of the proposed growth model, i.e. that the observed crystal structure of a substance is not necessarily that of lowest free energy for the infinite crystal, but rather corresponds to a local minimum that is made accessible by the kinetics of a particular growth process, is discussed.

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Section: Discussionmentioning

confidence: 99%

Cross-twinning model of fcc crystal growth

Waal

1996

Journal of Crystal Growth

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“…An isolated adatom at a surface site on a (111) plane has three nearest neighbors, whereas it has four at the reentrant groove, resulting in a stronger bonding and, thus, higher growth rate 274. Several theoretical calculations pointed out that growth by nucleation at reentrant grooves is the most efficient at high supersaturation 275–279…”

Section: Mechanisms Of Nonspherical Morphology Evolution In Nmnpsmentioning

confidence: 99%

Nonspherical Noble Metal Nanoparticles: Colloid‐Chemical Synthesis and Morphology Control

2010

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Metal nanoparticles have been the subject of widespread research over the past two decades. In recent years, noble metals have been the focus of numerous studies involving synthesis, characterization, and applications. Synthesis of an impressive range of noble metal nanoparticles with varied morphologies has been reported. Researchers have made a great progress in learning how to engineer materials on a nanometer length scale that has led to the understanding of the fundamental size- and shape-dependent properties of matter and to devising of new applications. In this article, we review the recent progress in the colloid-chemical synthesis of nonspherical nanoparticles of a few important noble metals (mainly Ag, Au, Pd, and Pt), highlighting the factors that influence the particle morphology and discussing the mechanisms behind the nonspherical shape evolution. The article attempts to present a thorough discussion of the basic principles as well as state-of-the-art morphology control in noble metal nanoparticles.

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“…They showed the twin lamella to act as self-perpetuating sites of enhanced nucleation. They also compared growth by the screw dislocation mechanism and the growth at steps on the surface created by stacking faults with the growth at reentrant corners, and concluded that growth by nucleation at reentrant grooves is the most efficient at high supersaturation Li et al, 1994a;.…”

Section: Influence Of Twinning On the Morphology Of Agbr Microcrystalsmentioning

confidence: 99%

Transmission electron microscopy studies of (111) twinned silver halide microcrystals

Goessens

Schryvers

Landuyt

1998

Microsc. Res. Tech.

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The present paper covers the results of different transmission electron microscopy studies on silver halide microcrystals. Pure AgBr as well as core‐shell AgBr‐AgBrI crystals are investigated. In the former parallel and non‐parallel twinning modes yielding tabular and needle‐ or tetrahedral‐shaped microcrystals, respectively, are discussed. Also the short‐range‐order of Ag+ interstitials around the twin planes as determined from diffuse intensity in reciprocal space is described. The latter yields a technique to determine the variant in which dislocations are located in certain core‐shell microcrystals. The introduction of iodine also results in the presence of inclined stacking faults in the shell and of long‐range iodine ordering on the crystal surface. Microsc. Res. Tech. 42:85–99, 1998. © 1998 Wiley‐Liss, Inc.

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Re-entrant corner mechanism of fcc crystal growth of a-type twin lamella: the Monte-Carlo simulation approach

Cited by 11 publications

References 8 publications

Cross-twinning model of fcc crystal growth

Cross-twinning model of fcc crystal growth

Nonspherical Noble Metal Nanoparticles: Colloid‐Chemical Synthesis and Morphology Control

Transmission electron microscopy studies of (111) twinned silver halide microcrystals

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