Interfaces of Mixed Crystallographic Planes of NiO Nanograins

Yeh, Sung-Wei; Ji, Yi-Jen; Huang, Hsuan‐Jung; Gan, Dershin; Shen, Pouyan

doi:10.1021/jp103244g

Cited by 7 publications

(4 citation statements)

References 36 publications

(56 reference statements)

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“…Based on the analysis of HRTEM image, the geometry of highly crystalline face-centred cubic NiO could be determined as hexagonal with dominant {11 0} facets. [34,54] The Figure 5 d illustrates the corresponding simulated model of the hexagonal NiO with faceted crystals direction. Both hexagons are {11 0} facet planes and the side planes are {111} and {2 0 0} facet planes.…”

Section: Resultsmentioning

confidence: 99%

Controlled Synthesis of a Hexagonal‐Shaped NiO Nanocatalyst with Highly Reactive Facets {1 1 0} and Its Catalytic Activity

et al. 2015

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A new facile chemical approach has been developed to produce hexagonal‐shaped NiO nanocrystals with high‐energy facets {1 1 0} under hydrothermal synthesis followed by annealing in the presence of air. The phase purity, crystallinity, shape/size, and mesostructure of NiO nanocrystals were investigated by powder XRD and high‐resolution transmission electron microscopy. The size, shape, and exposed crystal facets of the nanocrystals are the key factor for their physical and chemical properties. Herein, the chemical properties of hexagonal‐shaped NiO nanocrystals have been tested for the reduction of carbonyl compounds in comparison with NiO nanoparticles and bulk NiO materials. The reactivity of the NiO nanocrystals is enhanced dramatically through morphology evolution. In particular, hexagonal‐shaped NiO nanocrystals with highly reactive {1 1 0} facets exhibit approximately 12 and 25 % higher catalytic activity than NiO nanoparticles and bulk NiO, respectively. These hexagonal‐shaped NiO nanocrystals are active over several cycles for the reduction of carbonyl compounds to their respective alcohol in the presence of 2‐propanol.

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Section: Resultsmentioning

confidence: 99%

Controlled Synthesis of a Hexagonal‐Shaped NiO Nanocatalyst with Highly Reactive Facets {1 1 0} and Its Catalytic Activity

et al. 2015

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“…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%

Mincy mesosiderite metallic nodules analyzed byEBSD: 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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“…11 of Lin et al, 2015). The asymmetric tilt boundaries of a single-phase bicrystal have been systematically studied by Yeh et al (2010) using a novel nanofilm method by rotating nanograins. Briefly, ion-beam sputtering was used to prepare very thin epitaxial NiO nanofilms on the (100), ( 110), ( 111) and ( 112) surfaces of NaCl single crystals.…”

Section: Discussionmentioning

confidence: 99%

“…The results of this study may be extended to the [UVW]-specific COR variants and heterotilt boundaries for composite materials. These features have been rarely explored compared with the well documented symmetric or asymmetric tilt boundaries of f.c.c.-type Al (Hasson & Goux, 1971) and rocksalt-type NiO (Yeh et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

On the forbidden and the optimum crystallographic variant of rutile in garnet

et al. 2016

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In many inclusion–host systems with similar oxygen packing schemes, the optimum crystallographic orientation relationship (COR) between the inclusion and the host is mostly determined by matching the similar oxygen sublattices of the two structures. In contrast, the prediction of the optimum COR or even just the rationalization of the observed COR(s) between an inclusion and host with incompatible oxygen sublattices, like rutile–garnet, is not straightforward. The related documentation for such cases is therefore limited. Given the abundant crystallographic data for the rutile–garnet system acquired by transmission electron microscopy and electron backscatter diffraction methods recently, this problem can now be examined in detail for the critical structural factors dictating the selection of optimum COR in such a structurally complicated system. On the basis of the unconstrained three‐dimensional lattice point match and structural polyhedron match calculated for the observed CORs, it becomes clear that the prerequisite of optimum COR for rutile (rt) in garnet (grt) is to have most of their octahedra similarly oriented/inclined in space by aligning ⟨103⟩rt and ⟨111⟩grt for needle extension growth. Further rotation along the ⟨103⟩rt//⟨111⟩grt direction then leads to the energetically most favorable COR‐2 variant with a good lattice point match defined by the coincidence site lattice (CSL) and a good topotaxial match of the constituent polyhedra at the CSL points, leaving unfavorable COR‐1′ in the forbidden zones. This understanding sheds light not only on hierarchical energetics for the selection of inclusion variants in a complicated inclusion–host system, but also on yet‐to‐be‐explored [UVW]‐specific CORs and hetero‐tilt boundaries for composite materials in general.

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Interfaces of Mixed Crystallographic Planes of NiO Nanograins

Cited by 7 publications

References 36 publications

Controlled Synthesis of a Hexagonal‐Shaped NiO Nanocatalyst with Highly Reactive Facets {1 1 0} and Its Catalytic Activity

Controlled Synthesis of a Hexagonal‐Shaped NiO Nanocatalyst with Highly Reactive Facets {1 1 0} and Its Catalytic Activity

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

On the forbidden and the optimum crystallographic variant of rutile in garnet

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