One Pot, Two Phases: Individual Orthorhombic and Face-Centered Cubic ZnSnO3 Obtained Synchronously in One Solution

2014 ◽  
Vol 53 (23) ◽  
pp. 12289-12296 ◽  
Author(s):  
Ying Wang ◽  
Peng Gao ◽  
Di Bao ◽  
Longqiang Wang ◽  
Yujin Chen ◽  
...  
Keyword(s):  
Face Centered Cubic ◽  
One Pot ◽  
Face Centered ◽  
Two Phases

scholarly journals Enhanced sunlight photocatalytic activity and biosafety of marine-driven synthesized cerium oxide nanoparticles

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Somayeh Safat ◽  
Foad Buazar ◽  
Salim Albukhaty ◽  
Soheila Matroodi
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Color Change ◽  
Removal Rate ◽  
Average Crystallite Size ◽  
Face Centered Cubic ◽  
One Pot ◽  
Stabilizing Agents ◽  
Face Centered ◽  
Living Organisms

AbstractThis contribution presents the biosynthesis, physiochemical properties, toxicity and photocatalytic activity of biogenic CeO2 NPs using, for the first time, marine oyster extract as an effective and rich source of bioreducing and capping/stabilizing agents in a one-pot recipe. CeO2 NPs formation was initially confirmed through the color change from light green to pale yellow and subsequently, their corresponding absorption peak was spectroscopically determined at 310 nm with an optical band-gap of 4.67 eV using the DR-UV technique. Further, XRD and Raman analyses indicated that nanoceria possessed face-centered cubic arrangements without any impurities, having an average crystallite size of 10 nm. TEM and SEM results revealed that biogenic CeO2 NPs was approximately spherical in shape with a median particle size of 15 ± 1 nm. The presence of various bioorganic substances on the surface of nanoparticles was deduced by FTIR and TGA results. It is found that marine-based nanoceria shows no cytotoxic effect on the normal cell, thus indicating their enhanced biocompatibility and biosafety to living organisms. Environmentally, due to energy band gap, visible light-activated CeO2 nanocatalyst revealed superior photocatalytic performance on degradation of methylene blue pollutant with removal rate of 99%. Owing to the simplicity, cost-effectiveness, and environmentally friendly nature, this novel marine biosynthetic route paves the way for prospective applications of nanoparticles in various areas.

scholarly journals Multi-Length Scale Characterization of the Gibeon Meteorite using Electron Backscatter Diffraction

2007 ◽  
Vol 15 (5) ◽  
pp. 6-11 ◽  
Author(s):  
Matthew M. Nowell ◽  
John O. Carpenter
Keyword(s):  
Electron Backscatter Diffraction ◽  
Nickel Content ◽  
Iron Core ◽  
Face Centered Cubic ◽  
Iron Nickel ◽  
Scale Characterization ◽  
Face Centered ◽  
Two Phases ◽  
Backscatter Diffraction

The Gibeon meteorite is a differentiated iron meteorite that fell in Nambia, Africa in prehistoric times, with fragments spread over an area 70 miles wide and 230 miles long. The Gibeon fall was initially discovered in 1836, and hundreds of thousands of kilograms of fragments have been recovered. These fragments represent the iron core of a meteorite that cooled and crystallized over thousands of years (Norton 2002).The microstructure of the Gibeon meteorite, which is primarily an iron-nickel alloy, consists of two phases: kamacite, a body-centered cubic material and taenite, a face-centered cubic material that metallurgists would refer to as ferrite and austenite respectively. This material initially crystallizes as taenite, and as the temperature decreases, transforms into kamacite. This meteorite is classified as a Fine Octahedrite (Of) with an average Nickel content of approximately 7.9%

Plasticity and Size Effects in High Purity Cobalt: An Experimental Study

2016 ◽  
Vol 879 ◽  
pp. 560-565
Author(s):  
Gwendoline Fleurier ◽  
Mayerling Martinez ◽  
Pierre Antoine Dubos ◽  
Eric Hug
Keyword(s):  
Size Effects ◽  
Threshold Value ◽  
Cubic Phase ◽  
Face Centered Cubic ◽  
Tem Analysis ◽  
Cubic Metals ◽  
Hexagonal Close Packed ◽  
A Value ◽  
Face Centered ◽  
Two Phases

The occurrence of size effects in cobalt was examined by the analysis of mechanical properties of samples with thickness t, in a large range of grain size d giving a number of grains across the thickness t/d. On Hall-Petch plots, from the very beginning of plastic strain, two linear behaviors are notable: the polycrystalline one for higher t/d and the multicrystalline one for lower t/d in which the flow stress is strongly reduced. (t/d)c is the threshold value between the two behaviors taking a value of around 14. This high value is directly linked to the low stacking fault energy of cobalt. The microstructure of the polycrystalline samples exhibits a strong basal texture and a small proportion of a secondary face-centered cubic phase in a hexagonal close-packed main phase was evidenced. TEM analysis enables to characterize the dislocations and the stacking faults present in the two phases. To complete the analysis, two plasticity stages can be distinguished: stage A corresponding to dislocations gliding and stage B driven by twinning. Size effects in cobalt are found to occur during gliding process and could be related to surface effects as previously shown in face-centered cubic metals.

A TEM study of the microstructures formed during the crystallization of Ni–Zr metallic glasses

1991 ◽  
Vol 6 (4) ◽  
pp. 755-759 ◽  
Author(s):  
R. Allem ◽  
G. L'Espérance ◽  
Z. Altounian ◽  
J.O. Ström-Olsen
Keyword(s):  
Metallic Glasses ◽  
Crystallization Process ◽  
Early Stage ◽  
Face Centered Cubic ◽  
Simple Cubic ◽  
Transmission Electron ◽  
The Face ◽  
Face Centered ◽  
Two Phases ◽  
Average Size

The microstructure of two metastable crystalline phases, which are formed during the first step of the crystallization process in Ni–Zr metallic glasses, was investigated by transmission electron microscopy. For the composition Ni33Zr67, crystallites with average size of 150 nm having the face-centered cubic E93 structure are formed. For the Ni42Zr58 composition, 100 nm size crystallites with a simple cubic unit cell, space group Pa3 are formed. The microstructure of the crystallites in the early stage of crystallization of the two phases is similar to globular morphology and internal striations.

scholarly journals High-pressure Melting Curves of and Phases of Iron

2019 ◽  
Vol 35 (4) ◽  
Author(s):  
Nguyen Thi Hong ◽  
Ho Khac Hieu
Keyword(s):  
Pressure Effects ◽  
Face Centered Cubic ◽  
Melting Temperatures ◽  
Melting Curves ◽  
Pressure Melting ◽  
Cubic Structure ◽  
Face Centered ◽  
Two Phases ◽  
Increasing Functions ◽  
Statistical Moment Method

Statistical moment method (SMM) has been applied in combination with Lindemann melting criterion to investigate pressure effects on melting temperature of iron. Melting curves of  phase with body-centered cubic structure and  phase with face-centered cubic structure of iron have been derived up to pressure 13 GPa and 90 GPa, respectively. This work shows that melting curves of these two phases of iron are increasing functions of pressure, and the higher the pressure is the lower the slopes of melting curves are. Our results are compared with those of available experimental data to verify the developed theory. The efficiency of the SMM on the investigation of melting temperatures of  and  phases of iron allows us to believe that the present SMM scheme can be developed extensively to determine melting temperatures of other phases of iron as well as other materials.

Effect of N2 Flow on Microstructure, Mechanical Properties and Oxidation Resistance of CrNx Coatings

2013 ◽  
Vol 750-752 ◽  
pp. 2117-2120
Author(s):  
Guo Zheng Nie ◽  
Chun Liang Zhong ◽  
Lan E Luo ◽  
Ren Long Zhou ◽  
Qiang Liu
Keyword(s):  
Mechanical Properties ◽  
Oxidation Resistance ◽  
Single Phase ◽  
High Hardness ◽  
Hexagonal Structure ◽  
Mixed Phase ◽  
Hard Coatings ◽  
Face Centered Cubic ◽  
Face Centered ◽  
Two Phases

A series of CrNx coatings were deposited by direct-current reactive magnetron sputtering. The microstructure, the hardness and oxidation resistance of the thin films were characterized respectively with X-ray diffraction (XRD) and nanoindentor. The effect of N2 flow on the microstructure, the hardness and oxidation resistance was studied. It was found that the CrNx film has two phases, the conformation of hcp-Cr2N (hexagonal structure) and fcc-CrN (face-centered cubic). In CrNx film phase structure, with N2 flow increasing, there is the conformation of CrNx films transition from Cr2N to Cr2N and CrN mixed phase, the final CrN single-phase. A single phase of CrNx films has very high hardness while thin film as mixed phase showed a low hardness. CrN has better oxidation resistance with the oxidation resistance temperature of 500°C to 600°C compared to Cr2N. Comparison of Cr2N and CrN on the mechanical properties and oxidation resistance, CrN has better comprehensive performance for protective hard coatings.

Comparison the Rapid Microwave-Assisted Polyol Route and Modified Chemical Reduction Methods to Synthesize the Pt Nanoparticles on the Ti0.7W0.3O2 Support

2018 ◽  
Vol 279 ◽  
pp. 181-186 ◽  
Author(s):  
Hau Quoc Pham ◽  
Tai Thien Huynh ◽  
At Van Nguyen ◽  
Anh Tram Ngoc Mai ◽  
Vi Thuy Thi Phan ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Chemical Reduction ◽  
Pt Nanoparticles ◽  
Face Centered Cubic ◽  
One Pot ◽  
Microwave Assisted ◽  
The Face ◽  
Reduction Methods ◽  
Face Centered ◽  
The One

The tungsten-modified titanium dioxide, which prepared through the one-pot solvothermal process, exhibited the large specific surface area (~ 202 m2/g) and greater electrical conductivity (~ 0.022 S/cm). Furthermore, for the comparison purpose to find appropriate approach for the synthesis 20 wt. % Pt NPs/Ti0.7W0.3O2 catalyst, the modified chemical reduction utilizing NaBH4 and the rapid microwave-assisted polyol using ethylene glycol were employed without any surfactants or stabilizers. The characterization of Pt-based electrocatalyst was investigated through XRD, SEM-EDX, TEM measurements. As result, the platinum nanocatalyst formation with the face-centered cubic structure (fcc) and the amount loading on Ti0.7W0.3O2 support approximately 20 wt. % of two synthesized methods. However, the diameter size and distribution of Pt nanoforms have clearly classified in two reduction route. For example, the Pt nanocatalyst, which was created by the rapid microwave-assisted polyol at 160 °C for 2 min, exhibited the good distribution on support with ~3 nm diameter. This could be ascribed to the fast and uniform heating of microwave-assisted and moderate reducing possibility of ethylene glycol. These results indicate that the rapid microwave-assisted polyol was an appropriate approach not only for synthesizing 20 wt. % Pt NPs/Ti0.7W0.3O2 catalyst but also for preparing Pt-based electrocatalysts.

ELASTIC AND VIBRATIONAL PROPERTIES OF ORDERED AND DISORDERED CuMnPt6

2013 ◽  
Vol 27 (27) ◽  
pp. 1350195 ◽  
Author(s):  
SHUO HUANG ◽  
CHUAN-HUI ZHANG ◽  
JING SUN ◽  
JIANG SHEN
Keyword(s):  
Elastic Anisotropy ◽  
Point Of View ◽  
Vibrational Properties ◽  
Face Centered Cubic ◽  
Vibrational Entropy ◽  
Embedded Atom ◽  
Face Centered ◽  
Two Phases ◽  
Fcc Phase ◽  
Experimental Values

In this paper, we have measured the elastic and vibrational properties of CuMnPt 6 with embedded-atom method in three states of chemical order: as a disordered FCC (face-centered cubic) solid solution and as the equilibrium L1 2 and ABC 6 ordered structures. Our results agree quite well with the comparable experimental values. The present calculations indicate that the ABC 6 and L1 2 phases are energetically more stable than FCC phase. Numerical estimates of a set of elastic parameters, including aggregate elastic modulus, Poisson's ratio, and elastic anisotropy are performed, and the results demonstrate that the FCC phase is much softer than other two phases. Further analysis from the point of view of vibrational properties such as phonon density of states and vibrational entropy difference are also presented in this study.

Porous NiO-SDC Carbonates Composite Anode for LT-SOFC Applications Produced by Pressureless Sintering

2011 ◽  
Vol 52-54 ◽  
pp. 488-493 ◽  
Author(s):  
Raharjo Jarot ◽  
Andanastuti Muchtar ◽  
Wan Ramli Wan Daud ◽  
Norhamidi Muhamad ◽  
Edy Herianto Majlan
Keyword(s):  
Average Particle Size ◽  
Average Particle ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Weight Percentage ◽  
Composite Anodes ◽  
Optimum Porosity ◽  
Face Centered ◽  
Two Phases ◽  
Cold Pressed

Composite anodes made of NiO and SDC-(Li/Na)2CO3 were investigated in relation to their structure, morphology, and porosity. As a first step, the anode powder was prepared by mixing the NiO with SDC-(Li/Na)2CO3 via solid state reaction in weight percentage of 60 : 40 wt% and in various compositions of carbonates (20 and 30wt%), namely NiO-SDC8020 and NiO-SDC7030, respectively. The powder mixtures were then calcined at 680oC. The resultant powder was fine with surface area of about 13.10-13.70 m2/g and an average particle size of 0.32-0.37µm. The powders consist of two phases i.e. the cubic NiO and face-centered cubic structure SDC-(Li/Na)2CO3 as confirmed with x-ray diffraction. The microstructures were observed under scanning electron microscopy (SEM). The anode pellets were later compacted at different pressures (27, 32 and 37 MPa) and sintered at 600oC. The optimum porosity (20.99-24.78%) was achieved for samples of NiO-SDC8020 and NiO-SDC7030 sintered at 600oC and cold pressed at 32 and 37 MPa.

Thermal Expansions of the Beta and Gamma Phases in a Co–Ni–Fe Superalloy Determined by X-ray Diffraction

2000 ◽  
Vol 15 (8) ◽  
pp. 1719-1723 ◽  
Author(s):  
M. S. Seehra ◽  
C. Cionca ◽  
A. Manivannan
Keyword(s):  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Relative Temperature ◽  
X Ray ◽  
Β Phase ◽  
Abrupt Jump ◽  
Initial Magnetic Susceptibility ◽  
Face Centered ◽  
Two Phases ◽  
Xrd Patterns

Commercially useful multiphase alloy Inconel 783 is made up of Ni(28%), Fe(25%), and Co(35%) with smaller amounts of Cr, Al, Nb, Mo, Ti, C, and Si. In this work, relative temperature variations of the lattice constants a(T)/a0 of the gamma (face-centered-cubic) and beta (body-centered-cubic) phases of this alloy are determined from 97 to 773 K using analyses of their x-ray diffraction (XRD) patterns. Plots of a(T)/a0 for the two phases vary from 1.0 at 97 K to 1.012 at 773 K and show that (i) for T = 500 K, thermal expansion of the β phase is larger than that of the = phase; and (ii) an abrupt jump is observed near 300 K. The appearance of new lines above 700 K in XRD representing Co2CrO4 and CoCr2O4 is interpreted in terms of the oxidation of the γ phase, whereas the β phase is oxidation resistant. The anomalous change in a(T)/a0, observed near 300 K and accompanied by a similar change in the temperature variation of the initial magnetic susceptibility, is not well understood. A brief discussion on the implications of these results is presented.

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