First Observation of Atomic Long Range Ordering in Metal-Oxide Based ZnMgO Wide Bandgap Heterostructures

1999 ◽  
Vol 583 ◽  
Author(s):  
R. D. Vispute ◽  
S. Choopun ◽  
Y. H. Li ◽  
D. M. Chalk ◽  
S. B. Ogale ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Long Range ◽  
Film Growth ◽  
Hexagonal Wurtzite Structure ◽  
Growth Conditions ◽  
Wide Bandgap ◽  
Wurtzite Structure ◽  
Semiconductor Thin Films ◽  
Superlattice Peak ◽  
Long Range Ordering

AbstractWe report the first observation of atomic long range ordering in the metal-oxide based wide bandgap (3.68 eV) ZnMgO alloy semiconductor thin films grown on sapphire (0001) by pulsed laser deposition. The ZnMgO system has the hexagonal wurtzite structure. The atomic ordering was deduced from the observations of forbidden x-ray diffraction peaks in the wurtzite structure. We show that under optimum thin film growth conditions, Zn and Mg preferentially occupy hcp sublattice. The relative intensity of the superlattice peak was largest for the Mg content in the range of 10%, which is about 50% of the solubility of Mg in ZnO. The observation of long range order in ZnMgO alloy semiconductor is quite important in the context of understanding issues related to the growth kinetics, surface reconstruction, and phase stability of metal-oxide based heterostructures and devices.

scholarly journals Long-range ordering of two-dimensional wide bandgap tantalum oxide nanosheets in printed films

2021 ◽  
Author(s):  
Melvin A. Timmerman ◽  
Rui Xia ◽  
Yang Wang ◽  
Kai Sotthewes ◽  
Mark Huijben ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Long Range ◽  
Tantalum Oxide ◽  
Wide Bandgap ◽  
Oxide Materials ◽  
Two Dimensional ◽  
Interesting Class ◽  
Long Range Ordering

Two-dimensional oxide materials are a well-studied, interesting class of materials, enabled by the fact that their bulk layered metal oxides, such as titanates and niobates, can be easily exfoliated within...

scholarly journals Long-range ordering in anodic alumina films: a microradian X-ray diffraction study

2010 ◽  
Vol 43 (3) ◽  
pp. 531-538 ◽  
Author(s):  
Kirill S. Napolskii ◽  
Ilya V. Roslyakov ◽  
Andrey A. Eliseev ◽  
Andrei V. Petukhov ◽  
Dmytro V. Byelov ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Long Range ◽  
Film Growth ◽  
Orientational Order ◽  
Anodic Alumina ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alumina Films ◽  
Self Organized ◽  
Long Range Ordering

A quantitative analysis of long-range order in the self-organized porous structure of anodic alumina films has been performed on the basis of a microradian X-ray diffraction study. The structure is shown to possess orientational order over macroscopic distances larger than 1 mm. At the same time, the interpore positional order is only short-range and does not extend over more than ∼10 interpore distances. These positional correlations are mostly lost gradually rather than at the domain boundaries, as suggested by the divergence of the peak width for the higher-order reflections. In the direction of the film growth the pores have a very long longitudinal self-correlation length of the order of tens of micrometres.

Short and Long-Range Ordering of (Ni0.67Cr0.33)1-xFex Alloys Under Electron Irradiation

1996 ◽  
Vol 439 ◽  
Author(s):  
E. Frely ◽  
B. Beuneu ◽  
A. Barbu ◽  
G. Jaskierowicz
Keyword(s):  
Electron Microscope ◽  
Transition Temperature ◽  
Long Range ◽  
Model Alloy ◽  
Resistivity Measurements ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
Superlattice Peak ◽  
Long Range Ordering ◽  
Kinetics Of

Abstract(Ni0.67Cr0.33)1-xFex alloys with x = 0, 5 and 10 at.%, have been irradiated at temperatures between 300°C and 500°C with the electrons of a 2.5MeV Van de Graaff accelerator and of a 1MeV High Voltage Electron Microscope (HVEM). All of them have been successively ordered at short and at long range under irradiation. The transition temperature is 525°C for Ni0.61Cr0.34Fe0.05 and 445°C for Ni0.59Cr0.31Fe0.10. An Inconel sample irradiated up to 1 d.p.a. in the 1MeV microscope did not show any superlattice peak although its composition is very close to the 10% iron model alloy. The kinetics of ordering has been followed by resistivity measurements and fitted by the Dienes kinetic model.

CRITICAL STRESS-INDUCED RELAXATION IN RELATION TO LONG-RANGE ORDERING, IN Au3Cu, AND SELF-INDUCED ORDERING, IN AuNi SOLID SOLUTIONS

1987 ◽  
Vol 48 (C8) ◽  
pp. C8-519-C8-524
Author(s):  
G. RENAUD ◽  
M. BELAKHOVSKY ◽  
J. HILLAIRET ◽  
M. WUTTIG ◽  
G. BESSENAY ◽  
...  
Keyword(s):  
Long Range ◽  
Solid Solutions ◽  
Critical Stress ◽  
Long Range Ordering

Quantitative Image Analysis of Fractal-like Thin Films of Organic Semiconductors

2018 ◽  
Author(s):  
Weikun Zhu ◽  
Erfan Mohammadi ◽  
Ying Diao
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Image Analysis ◽  
Fractal Dimension ◽  
Organic Semiconductors ◽  
Film Growth ◽  
Electronic Device ◽  
Significant Control ◽  
Semiconductor Thin Films ◽  
Two Parameters

Morphology modulation offers significant control over organic electronic device performance. However, morphology quantification has been rarely carried out via image analysis. In this work, we designed a MATLAB program to evaluate two key parameters describing morphology of small molecule semiconductor thin films: fractal dimension and film coverage. We then employ this program in a case study of meniscus-guided coating of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C<sub>8</sub>-BTBT) under various conditions to analyze a diverse and complex morphology set. The evolution of morphology in terms of fractal dimension and film coverage was studied as a function of coating speed. We discovered that combined fractal dimension and film coverage can quantitatively capture the key characteristics of C<sub>8</sub>-BTBT thin film morphology; change of these two parameters further inform morphology transition. Furthermore, fractal dimension could potentially shed light on thin film growth mechanisms.

Simplistic Synthesis and Enhanced Photocatalytic Performance of Spherical ZnO Nanoparticles Prepared from Arabinose Solution

2019 ◽  
Vol 74 (10) ◽  
pp. 937-944 ◽  
Author(s):  
Babiker Y. Abdulkhair ◽  
Mutaz E. Salih ◽  
Nuha Y. Elamin ◽  
A. MA. Fatima ◽  
A. Modwi
Keyword(s):  
Zno Nanoparticles ◽  
Photocatalytic Performance ◽  
Hexagonal Wurtzite Structure ◽  
Zinc Nitrate ◽  
Wurtzite Structure ◽  
Sugar Solution ◽  
X Ray Diffraction ◽  
Pollutant Degradation ◽  
X Ray ◽  
Good Crystallinity

AbstractStrenuous efforts have been employed to prepare zinc oxide (ZnO) with eco-friendly methods; however, few studies have reported the fabrication of ZnO using a sustainable procedure. In this study, spherical ZnO nanoparticles were successfully fabricated for photocatalysis applications using a simple and eco-friendly method using an arabinose sugar solution. The ZnO nanoparticles with a wurtzite structure were obtained by combining zinc nitrate and arabinose in water, followed by heating, evaporation, and calcinations at different annealing temperatures. The annealed ZnO photocatalysts were characterised via X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The findings revealed a hexagonal wurtzite structure and good crystallinity with crystallite size increasing from 18 to 31 nm by means of an increase in the annealing temperature. The photocatalytic performance was examined to determine the degradation of mix dye waste. The spherical ZnO nanoparticles showed mix pollutant degradation of 84 % in 25 min at 400 °C.

Relationship between low-Q peak and long-range ordering of ionic liquids revealed by high-energy X-ray total scattering

2015 ◽  
Vol 17 (27) ◽  
pp. 17838-17843 ◽  
Author(s):  
Kenta Fujii ◽  
Shinji Kohara ◽  
Yasuhiro Umebayashi
Keyword(s):  
Ionic Liquids ◽  
Long Range ◽  
High Energy ◽  
Real Space ◽  
Space Structure ◽  
Total Scattering ◽  
X Ray ◽  
Peak Intensity ◽  
Long Range Ordering

A new function, SQpeak(r); a connection between low-Q peak intensity with real space structure.

Long-range ordering in the Bi1−xAexFeO3−x/2 perovskites: Bi1/3Sr2/3FeO2.67 and Bi1/2Ca1/2FeO2.75

2008 ◽  
Vol 181 (10) ◽  
pp. 2601-2609 ◽  
Author(s):  
C. Lepoittevin ◽  
S. Malo ◽  
N. Barrier ◽  
N. Nguyen ◽  
G. Van Tendeloo ◽  
...  
Keyword(s):  
Long Range ◽  
Long Range Ordering
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