On the twinning and special grain boundaries of bimetallic particles via pulsed laser ablation of bulk AuCu in a vacuum

Lin, Bo-Cheng; Huang, Chang-Ning; Shen, Pouyan; Chen, Shuei-Yuan

doi:10.1039/c3ce41596a

Cited by 5 publications

(7 citation statements)

References 35 publications

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“…Such a coherent twin boundary can be regarded as a special {111} twist boundary by 60° rotation around the threefold <111> axis of the ABC layer stacked fcc, or a special symmetrical {111} tilt boundary by 70.5° rotation about the [101] axis, that is, the so‐called Σ3 {111} (70.5°) <110>{111} symmetrical tilt boundary. Thus, the {111} twin boundaries can be readily fabricated by the twist or tilt of the bicrystal in terms of the close‐packed planes and hence common for the fcc‐type crystals formed via the deformation (Kumar et al., 2016), growth, and/or coalescence‐rotation mechanisms (Lin et al., 2014). Furthermore, mosaic closure twins are common at grain boundaries/junctions with significant matrix constraint or sintering stress.…”

Section: Discussionmentioning

confidence: 99%

“…The misorientation‐dependent energy or the torque term at grain junction would trigger effective migration of metastable interface, or the so‐called high‐order twin boundary (Kumar et al., 2016), coupled with grain rotation into the stable primary {111} twin boundary. An intermediate interface with local energy cusp such as the {111}/{001} interface, that is, {111}/{001} <101> − 54.7° tilt boundary may be encountered as pertinent to the case of the adjoined NiO nanocrystals with fcc‐type Ni and O sublattice upon annealing (Yeh et al., 2010) and the bimetallic Au‐Cu nanoparticles via a laser ablation condensation route (Lin et al., 2014). It is worthwhile noting that high‐order twin boundaries (Σ9 and Σ27) based on ~{111} vicinal interface besides the primary (111) twin boundaries (Σ3) also occurred in nickel‐based superalloys when subject to isostatic compression under varied strain rates (Kumar et al., 2016).…”

Section: Discussionmentioning

confidence: 99%

“…The different thermal/shock history and the critical resolved shear stress in terms of the crystal orientation and the applied stress state of the reassembled fragments may account for the selective deformation of the individual metal nodules in meteorites which have been subjected to asteroid impacts and terrestrial landing. In this connection, the fcc‐type AuCu 3 and Cu‐doped Au particles, as produced by pulsed laser ablation of bulk AuCu in vacuum, were selectively deformed to show polysynthetic {111} twinning under the influence of strain relaxation and the shock effect (Lin et al., 2014).…”

Section: Discussionmentioning

confidence: 99%

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Mincy mesosiderite metallic nodules analyzed by EBSD: An approach to understanding their thermal history

García

Varela

Hwang

et al. 2022

Meteorit & Planetary Scien

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Meteorites carry information about the most common processes that have been active in the early solar system. In particular, mesosiderites are meteorites with a structure considered to be composed of equal parts of iron–nickel metal and silicates. A natural delimitation in the study of such complex systems is the discrimination of the iron–nickel metallic and silicate domains. In this work, we focus on the metallic phases of the Mincy mesosiderite, a specimen available at the Instituto de Ciencias Astronómicas, de la Tierray y del Espacio repository. In Mincy, the metallic phases are iron–nickel–carbon alloys that are distributed forming metallic lumps or pebbles (referred to as metallic nodules in the article) in which kamacite and taenite are present, and taenite is found both at the kamacite/silicate interface and surrounded by kamacite, that is, isolated from the silicates. We made use of the electron backscattered diffraction technique to determine the crystallographic orientation relationships along the taenite/kamacite boundaries as well as for characterizing the (hkl)‐specific grain boundaries regarding the underlying tilt, twist, or twinning mechanism to assist the interpretation of the phase transformations and mechanisms that could explain the formation of these metallic nodules. From the results, each of the metallic nodules has a unique temperature–pressure history and kinetics to undergo phase transformations (mainly partial melting, heterogeneous nucleation‐controlled solidification, and possible evaporation–condensation) as well as liquid‐phase sintering and recrystallization in its own way.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Mincy mesosiderite metallic nodules analyzed by EBSD: An approach to understanding their thermal history

García

Varela

Hwang

et al. 2022

Meteorit & Planetary Scien

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“…These results reveal the multiple twinned structure of the copper particle. Meanwhile, we found that the scattering spots did not locate strictly in the vertex of pentagon, indicating that the five‐twinned crystal of an elongated pentagonal bipyramids was not absolutely symmetric …”

Section: Resultsmentioning

confidence: 94%

Self‐Supporting AuCu@Cu Elongated Pentagonal Bipyramids Toward Neutral Glucose Sensing

Wang

Jin

Zhang

et al. 2016

Part & Part Syst Charact

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Controlling the electronic structure of a catalyst has become an important approach to tune and optimize its antipoisoning ability and catalytic efficiency for a chemical reaction. Using d‐mannitol as a structure‐directing agent to induce size transformation and twinned defects in copper particles, penta‐twinned Cu elongated pentagonal bipyramids as supports have been synthesized, and HAuCl4 is reduced in situ to form an AuCu alloy on the surface of Cu, generating a self‐supporting AuCu@Cu core–shell structure for application as a glucose sensor in a neutral medium. The AuCu@Cu elongated pentagonal bipyramids with 0.42 at% Au show activities comparable with the Au and Pt catalyst but are more tolerant toward Cl− than Au and more tolerant toward H3–xPO4x− than Cu. The mass activity of AuCu@Cu reaches 0.10 A mg−1 of Au at 0.6 V versus Ag/AgCl (3 m KCl) in a pH 8.0 buffer. The self‐supporting AuCu@Cu elongated pentagonal bipyramids are promising catalysts for glucose sensing in a neutral medium. This work offers an effective way to design antitoxic and durable catalysts with ultralow content of noble metal for glucose sensing.

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“…[ 16 ] On the other hand, fivefold twinning is the most common form for multiple twinning and is widely observed in nanoparticles and thin films. [ 17–23 ] It ever has attracted the attention not only of crystal growth and crystallography research, but also of cluster physics, physical chemistry, surface science, thin films, and materials research. [ 17 ]…”

Section: Introductionmentioning

confidence: 99%

Twin Boundary and Fivefold Twins in Nickel Oxide

Zhao

Xing

et al. 2020

Physica Status Solidi (b)

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Twinning is a common phenomenon in crystal growth and mechanical deformation. It plays a key role in tuning the mechanical and transport properties of metals. In transition metal oxides, the twinning may give additional changes related to magnetism. Herein, the atomic configuration and the electronic structure of the twin boundaries (TBs) in rock‐salt‐type NiO are studied, combining aberration‐corrected transmission electron microscopy and first‐principles calculations. For NiO, the twinning occurs on the (111) plane, with oxygen atoms located at the TB and antiferromagnetic (AFM) coupling between the mirroring Ni atomic planes near the TB. The configuration gives the TB energy of 0.26 J m−2. Atomic and magnetic structures of fivefold twins in NiO are also investigated. In the structure of fivefold twins with the lowest energy, ferromagnetic coupling is formed in the AFM TBs due to the competing exchange interaction at the core of fivefold twins.

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On the twinning and special grain boundaries of bimetallic particles via pulsed laser ablation of bulk AuCu in a vacuum

Cited by 5 publications

References 35 publications

Mincy mesosiderite metallic nodules analyzed by EBSD: An approach to understanding their thermal history

Mincy mesosiderite metallic nodules analyzed by EBSD: An approach to understanding their thermal history

Self‐Supporting AuCu@Cu Elongated Pentagonal Bipyramids Toward Neutral Glucose Sensing

Twin Boundary and Fivefold Twins in Nickel Oxide

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