scholarly journals Facile and rapid synthesis of crystalline quadruply bonded Cr(ii) acetate coordinated with axial ligands

RSC Advances ◽  
2019 ◽  
Vol 9 (42) ◽  
pp. 24319-24324 ◽  
Author(s):  
Intek Song ◽  
Jinyoung Koo ◽  
Seok Min Yoon
Keyword(s):  
Single Crystals ◽  
Anoxic Condition ◽  
Axial Position ◽  
Rapid Synthesis ◽  
Rapid Crystallization ◽  
Axial Ligands

Facile ligation of quadruply bonded Cr(ii) acetates at the axial position under the anoxic condition and their rapid crystallization into single crystals with sub-millimeter scale.

Crystallization of Intrinsic Amorphous Layers Produced by Stoichiometric Implantation of Al and O Ions in A-Axis Oriented Al2O3 Single Crystals

1989 ◽  
Vol 157 ◽  
Author(s):  
W. Zhou ◽  
D.X. Cao ◽  
D.K. Sood
Keyword(s):  
Free Surface ◽  
Epitaxial Growth ◽  
Single Crystals ◽  
Isothermal Annealing ◽  
Interface Velocity ◽  
Planar Interface ◽  
Rapid Crystallization ◽  
Substrate Orientation ◽  
Prolonged Annealing ◽  
Tentative Model

ABSTRACTIsothermal annealing behaviour of intrinsic amorphous layers produced by stoichiometric implantation in a—axis oriented α—Al2O3 single crystals has been studied. The amorphous phase transforms directly to α—Al2O3 at a well defined planar interface which moves towards the free surface. The epitaxial growth slows down after initial rapid crystallization, indicating two separate regimes. The interface velocity shows Arrhenius behaviour in both regimes with activation energies of 0.6 and 0.08 eV respectively. There is an evidence for additional surface or random crystallization into κ or γ-Al2O3 phases within the first few nm on the surface, after prolonged annealing. These results are remarkably different from those reported previously for c–axis oriented Al2O3 crystals, showing the importance of substrate orientation during crystallization. A tentative model to explain the crystallization behaviour is discussed.

One-step rapid synthesis of Ni6(C12H25S)12 nanoclusters for electrochemical sensing of ascorbic acid

The Analyst ◽  
2020 ◽  
Vol 145 (7) ◽  
pp. 2621-2630
Author(s):  
Zhihua Zhuang ◽  
Wei Chen
Keyword(s):  
Ascorbic Acid ◽  
Single Crystals ◽  
Electrochemical Sensing ◽  
Rapid Synthesis ◽  
One Step ◽  
Sensing Performance

Ni6(C12H25S)12 clusters and their single crystals are synthesized successfully and the Ni6 clusters show high electrochemical sensing performance for the detection of ascorbic acid.

Interaction of manganese corroles with TCNQ and related acceptor molecules

2020 ◽  
Vol 24 (05n07) ◽  
pp. 705-711
Author(s):  
Benedikt Wolfram ◽  
Çağla Baş ◽  
Christian Kleeberg ◽  
Martin Bröring
Keyword(s):  
Charge Transfer ◽  
Single Crystals ◽  
High Reactivity ◽  
Geometric Parameters ◽  
Oxidation States ◽  
Stacking Interactions ◽  
Oxygenated Compounds ◽  
Axial Ligands ◽  
Donor Acceptor ◽  
New Compounds

Manganese corroles with the Mn atom in the oxidation states +III and +IV have been probed as donor moieties for supramolecular stacked donor–acceptor complexes with the typical acceptor units TCNQ (tetracyanoquinone), TCNP (tetracyanopyrazine), and TCNB (tetracyanobenzene). Four new compounds formed as single crystals from different co-crystallization attempts. In those cases where a Mn(III) corrole was used as the donor component, hydrolyzed and/or oxygenated compounds [(cor)Mn(TCNQ*)] and [(cor*)Mn(TCNP*)] were obtained as the exclusive products. With chloridomanganese(IV) corroles, sandwich-like 2:1 complexes [(cor)MnCl][Formula: see text][TCNQ] and [(cor)MnCl][Formula: see text][TCNB] form, with both components left intact. Crystallographic analyses reveal partial or complete charge transfer to unusual axial ligands and thus prove the high reactivity of Mn(III) corroles in the first two cases. For the sandwich arrangements, almost-unaltered geometric parameters of the Mn(IV) corroles are observed, pointing to negligible structural consequences for metal corroles when engaged in stacking interactions.

Rapid synthesis of inorganic halide perovskite single crystals with high thermal stability

2020 ◽  
Vol 759 ◽  
pp. 137985
Author(s):  
Yingnan Yang ◽  
Dongxue Wu ◽  
Zhen Zhang ◽  
Wei Cao ◽  
Xiaochong Zhao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Single Crystals ◽  
High Thermal Stability ◽  
Rapid Synthesis ◽  
Halide Perovskite

The Microstructure of Shock-Synthesized Diamond

1967 ◽  
Vol 25 ◽  
pp. 324-325
Author(s):  
Lucien F. Trueb
Keyword(s):  
Single Crystals ◽  
Preferred Orientation ◽  
High Magnification ◽  
Texture Pattern ◽  
Shock Process ◽  
New Type ◽  
Diffraction Diagram

A new type of synthetic industrial diamond formed by an explosive shock process has been recently developed by the Du Pont Company. This material consists of a mixture of two basically different forms, as shown in Figure 1: relatively flat and compact aggregates of acicular crystallites, and single crystals in the form of irregular polyhedra with straight edges.Figure 2 is a high magnification micrograph typical for the fibrous aggregates; it shows that they are composed of bundles of crystallites 0.05-0.3 μ long and 0.02 μ. wide. The selected area diffraction diagram (insert in Figure 2) consists of a weak polycrystalline ring pattern and a strong texture pattern with arc reflections. The latter results from crystals having preferred orientation, which shows that in a given particle most fibrils have a similar orientation.

A New Defect in Polyethylene Single Crystals

1973 ◽  
Vol 31 ◽  
pp. 70-71
Author(s):  
E. L. Thomas ◽  
S. L. Sass
Keyword(s):  
Single Crystals ◽  
Screw Dislocation ◽  
Small Distance ◽  
Dipole Model ◽  
Dislocation Dipole ◽  
Chain Folding ◽  
Black And White ◽  
Polymer Crystal ◽  
Different Types

In polyethylene single crystals pairs of black and white lines spaced 700-3,000Å apart, parallel to the [100] and [010] directions, have been identified as microsector boundaries. A microsector is formed when the plane of chain folding changes over a small distance within a polymer crystal. In order for the different types of folds to accommodate at the boundary between the 2 fold domains, a staggering along the chain direction and a rotation of the chains in the plane of the boundary occurs. The black-white contrast from a microsector boundary can be explained in terms of these chain rotations. We demonstrate that microsectors can terminate within the crystal and interpret the observed terminal strain contrast in terms of a screw dislocation dipole model.

Preferential Sputtering of Ni3Al Single Crystals Studied Using Atom-Probe Field-Ion Microscopy and XPS

1981 ◽  
Vol 39 ◽  
pp. 16-17
Author(s):  
M.P. Thomas ◽  
A.R. Waugh ◽  
M.J. Southon ◽  
Brian Ralph
Keyword(s):  
Single Crystals ◽  
Photoelectron Spectroscopy ◽  
Surface Composition ◽  
Depth Profiling ◽  
Analytical Techniques ◽  
Atom Probe ◽  
Probe Field ◽  
Preferential Sputtering ◽  
Argon Ion Bombardment ◽  
Argon Ion

It is well known that ion-induced sputtering from numerous multicomponent targets results in marked changes in surface composition (1). Preferential removal of one component results in surface enrichment in the less easily removed species. In this investigation, a time-of-flight atom-probe field-ion microscope A.P. together with X-ray photoelectron spectroscopy XPS have been used to monitor alterations in surface composition of Ni3Al single crystals under argon ion bombardment. The A.P. has been chosen for this investigation because of its ability using field evaporation to depth profile through a sputtered surface without the need for further ion sputtering. Incident ion energy and ion dose have been selected to reflect conditions widely used in surface analytical techniques for cleaning and depth-profiling of samples, typically 3keV and 1018 - 1020 ion m-2.

Dislocation structures around SiO2 Particles in aged Cu-Cr-SiO2

1978 ◽  
Vol 36 (1) ◽  
pp. 594-595
Author(s):  
N.J. Long ◽  
M.H. Loretto ◽  
C.H. Lloyd
Keyword(s):  
Flow Stress ◽  
Single Crystals ◽  
Room Temperature ◽  
Thin Foil ◽  
Age Hardening ◽  
Dispersion Strengthening ◽  
Accurate Picture ◽  
The Matrix ◽  
Very High ◽  
Good Agreement

IntroductionThere have been several t.e.m. studies (1,2,3,4) of the dislocation arrangements in the matrix and around the particles in dispersion strengthened single crystals deformed in single slip. Good agreement has been obtained in general between the observed structures and the various theories for the flow stress and work hardening of this class of alloy. There has been though some difficulty in obtaining an accurate picture of these arrangements in the case when the obstacles are large (of the order of several 1000's Å). This is due to both the physical loss of dislocations from the thin foil in its preparation and to rearrangement of the structure on unloading and standing at room temperature under the influence of the very high localised stresses in the vicinity of the particles (2,3).This contribution presents part of a study of the Cu-Cr-SiO2 system where age hardening from the Cu-Cr and dispersion strengthening from Cu-Sio2 is combined.

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