scholarly journals 100-nm thick single-phase wurtzite BAlN films with boron contents over 10%

2017 ◽  
Vol 254 (8) ◽  
pp. 1600699 ◽  
Author(s):  
Xiaohang Li ◽  
Shuo Wang ◽  
Hanxiao Liu ◽  
Fernando A. Ponce ◽  
Theeradetch Detchprohm ◽  
...  
Keyword(s):  
Single Phase ◽  
Single Phase Wurtzite

Growth of single-phase wurtzite BAlN with 7.2%-B contents

2016 ◽  
Author(s):  
Xiaohang Li ◽  
Shuo Wang ◽  
Hanxiao Liu ◽  
Fernando Ponce ◽  
Theeradetch Detchprohm ◽  
...  
Keyword(s):  
Single Phase ◽  
Single Phase Wurtzite

Ferromagnetic Homogeneous Polycrystalline Zn1-xCoxO Oxides

2006 ◽  
Vol 45 ◽  
pp. 2520-2527
Author(s):  
Yue Bin Zhang ◽  
Sean Li
Keyword(s):  
Single Phase ◽  
Nearest Neighbor ◽  
Ferromagnetic Behavior ◽  
Additional Contribution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxygen Ions ◽  
Random Manner ◽  
Single Phase Wurtzite Structure ◽  
Single Phase Wurtzite

In this work, the structural and magnetic properties of polycrystalline Zn1-xCoxO (x = 0, 0.02, 0.05, 0.0625, 0.10 and 0.15) oxides were studied in detail. Rietveld refinement of x-ray diffraction spectra indicates that a single-phase wurtzite structure was formed in Zn1-xCoxO samples for x up to 0.10. The magnetization for x = 0.02 can be fitted to a model with a paramagnetic Curie term and a diamagnetic constant which could arise from spins of isolated free Co ions and a diamagnetic background, respectively. For x > 0.02, however, an additional antiferromagnetic Curie-Weiss term needs to employ for fitting. This is due to an additional contribution from clustered Co ions that are in nearest neighbor positions through oxygen ions. Results show that the substitution of Co at the Zn site does not occur in a completely random manner but Co ions appear to have a tendency for clustering. In addition, the homogenous ZnO:Co thin film prepared by Pulsed Laser Deposition on SiO2/Si substrate shows ferromagnetic behavior at room temperature.

Raman scattering and interstitial Li defects induced polarization in co-doped multiferroic Zn0.96-yCo0.04LiyO (0.00 ≤ y ≤ 0.10) nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (50) ◽  
pp. 39828-39839 ◽  
Author(s):  
Saif Ullah Awan ◽  
S. K. Hasanain ◽  
M. S. Awan ◽  
Saqlain A. Shah
Keyword(s):  
Raman Scattering ◽  
Crystalline Structure ◽  
Zno Nanoparticles ◽  
Single Phase ◽  
Induced Polarization ◽  
Raman Analysis ◽  
Doped Zno ◽  
Single Phase Wurtzite ◽  
Co Doped

Structural and Raman analysis confirmed a single phase wurtzite hexagonal crystalline structure of Li–Co co-doped ZnO nanoparticles.

Photoluminescence of ZrO2-ZnO Hybrid Nanotube Arrays Produced by Electrodeposition

2012 ◽  
Vol 512-515 ◽  
pp. 1484-1487
Author(s):  
Li Min Guo ◽  
Xiao Hui Wang ◽  
Long Tu Li
Keyword(s):  
Quantum Dots ◽  
Oxygen Vacancy ◽  
Single Phase ◽  
Nanotube Arrays ◽  
Deposition Technique ◽  
Electro Deposition ◽  
20 Nm ◽  
Hybrid Layers ◽  
Zno Qds ◽  
Single Phase Wurtzite

Highly ordered ZrO2 nanotube (NT) arrays were fabricated by anodization in organic electrolyte containing NH4F. The NTs have an opened porous structure at the top end. A facile electro-deposition technique was used to prepare ZnO quantum dots (QDs) in the pores of the ZrO2 NTs. Characterizations of SEM, XRD, HR-TEM were performed on the NTs. The results confirmed the formation of single-phase wurtzite ZnO nanoparticles in the ZrO2 NTs with a size around 20 nm. Photoluminescence (PL) spectra proved that the ZnO QDs coating had strongly enhanced the PL signal for blue (366nm) and green (503nm) light emissions of the hybrid NT arrays. That maybe arose from structure-dependent defects and oxygen vacancy in the hybrid layers.

Pulsed-Metal Organic Chemical Vapor Deposition (PMOCVD) for Growth of Single Phase Wurtzite MgxZn1-xO Epitaxial Film with High Mg Content (x=0.51)

MRS Advances ◽  
2016 ◽  
Vol 1 (4) ◽  
pp. 299-304 ◽  
Author(s):  
Fikadu Alema ◽  
Oleg Ledyaev ◽  
Ross Miller ◽  
Valeria Beletsky ◽  
Andrei Osinsky ◽  
...  
Keyword(s):  
Vapor Deposition ◽  
Single Phase ◽  
Epitaxial Film ◽  
Chemical Vapor ◽  
Organic Chemical ◽  
High Quality ◽  
Metal Organic ◽  
Mg Content ◽  
Organic Chemical Vapor Deposition ◽  
Single Phase Wurtzite

ABSTRACTPulsed metal organic chemical vapor deposition (PMOCVD) was used to grow high Mg content, high quality, wurtzite MgxZn1-xO (MgZnO) epitaxial film to realize photodetectors and emitters in the solar blind spectral window. MgZnO films with various Mg contents were deposited on c-plane Al2O3 with and without AlN buffer layer. The band gap of the films range from 3.24 eV to 4.49 eV, corresponding to fraction of Mg between x=0.0 to x=0.51, as determined by Rutherford backscattering spectroscopy (RBS). Cathodoluminescence (CL) measurement showed a linear blue shift in the spectral peak position of MgxZn1-xO with an increase in x. No multi-absorption edge or CL band splitting was observed, indicating the phase purity of the films and was confirmed by XRD analysis. The surface quality of the films has improved with the increase in Mg content. To the best of our knowledge, the current result shows the highest Mg content (x=0.51), high quality, single phase wurtzite MgZnO epitaxial film ever grown by MOCVD. This is realized due to the non-equilibrium behavior of PMOCVD in which radicals that are formed during the growth process will have insufficient time to reach equilibrium.

Synthesis, Characterization and Optical Properties of ZnO Nanoparticles Doped with Er and Yb

2021 ◽  
Vol 21 (11) ◽  
pp. 5714-5722
Author(s):  
S. Fuentes ◽  
D. Espinoza ◽  
J. León
Keyword(s):  
Optical Properties ◽  
Single Phase ◽  
Sol Gel ◽  
Particle Morphology ◽  
Hexagonal Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Single Phase Wurtzite Structure ◽  
Single Phase Wurtzite

This paper discusses the structure, particle morphology, and optical properties of un-doped ZnO and ZnO doped with Er3+ and Yb3+ lanthanide ion nanoparticles (NPs) through a process denominated sol-gel-hydrothermal. According to the pattern of X-ray diffraction, ZnO:Er and ZnO:Yb is formed by a single-phase wurtzite structure with crystallites sized ~65 nm on average, and Er or Yb dopant ions in the hexagonal structure of ZnO, specifically in its distorted lattice sites. The results also suggest the possible role of oxygen vacancies or Ox– (defects) in the energy transfer from ZnO to the Er or Yb ions with a decrease of 3.18 eV and 3.19 eV in bandgap values to a red shift.

Absence of ferromagnetism in single-phase wurtzite Zn1−xMnxO polycrystalline thin films

2010 ◽  
Vol 108 (7) ◽  
pp. 073922 ◽  
Author(s):  
S. Gilliland ◽  
A. Segura ◽  
J. F. Sánchez-Royo ◽  
L. M. García ◽  
F. Bartolomé ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Phase ◽  
Polycrystalline Thin Films ◽  
Single Phase Wurtzite

Influence of Heat Treatments on Microstructures in an Fe-Co-V Alloy

1974 ◽  
Vol 32 ◽  
pp. 512-513
Author(s):  
S. Mahajan ◽  
M. R. Pinnel ◽  
J. E. Bennett
Keyword(s):  
Single Phase ◽  
Alloy Composition ◽  
Supersaturated Solid Solution ◽  
Cell Formation ◽  
Heat Treatments ◽  
Air Cooling ◽  
Iced Brine ◽  
Transmission Electron ◽  
The Matrix ◽  
Bcc Structure

The microstructural changes in an Fe-Co-V alloy (composition by wt.%: 2.97 V, 48.70 Co, 47.34 Fe and balance impurities, such as C, P and Ni) resulting from different heat treatments have been evaluated by optical metallography and transmission electron microscopy. Results indicate that, on air cooling or quenching into iced-brine from the high temperature single phase ϒ (fcc) field, vanadium can be retained in a supersaturated solid solution (α2) which has bcc structure. For the range of cooling rates employed, a portion of the material appears to undergo the γ-α2 transformation massively and the remainder martensitically. Figure 1 shows dislocation topology in a region that may have transformed martensitically. Dislocations are homogeneously distributed throughout the matrix, and there is no evidence for cell formation. The majority of the dislocations project along the projections of <111> vectors onto the (111) plane, implying that they are predominantly of screw character.

Raman And Fluorescence Spectra Observed in Laser Microprobe Measurements of Several Compositions in the Ln-Ba-Cu-O System

1990 ◽  
Vol 48 (2) ◽  
pp. 278-279
Author(s):  
Edgar S. Etz ◽  
Thomas D. Schroeder ◽  
Winnie Wong-Ng
Keyword(s):  
Fluorescence Spectra ◽  
Single Phase ◽  
X Ray Diffraction ◽  
Ceramic Powders ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Raman Microprobe ◽  
Methods Of Synthesis ◽  
Compositional Homogeneity ◽  
Processing Techniques

We are investigating by Raman microprobe measurements the superconducting and related phases in the LnBa2Cu3O7-x (for x=0 to 1) system where yttrium has been replaced by several of the lanthanide (Ln = Nd,Sm,Eu,Ho,Er) elements. The aim is to relate the observed optical spectra (Raman and fluorescence) to the compositional and structural properties of these solids as part of comprehensive materials characterization. The results are correlated with the methods of synthesis, the processing techniques of these materials, and their superconducting properties. Of relevance is the substitutional chemistry of these isostructural systems, the differences in the spectra, and their microanalytical usefulness for the detection of impurity phases, and the assessment of compositional homogeneity. The Raman spectra of most of these compounds are well understood from accounts in the literature.The materials examined here are mostly ceramic powders prepared by conventional solid state reaction techniques. The bulk samples are of nominally single-phase composition as determined by x-ray diffraction.

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