Structural and Hydrogenation Properties of Zr0.9Ti0.1Cr1.2-xV0.8Nix (x=0, 0.4) Compounds

2010 ◽  
Vol 636-637 ◽  
pp. 880-886
Author(s):  
A. Ioannidou ◽  
S.S. Makridis ◽  
Erik Zupanič ◽  
Albert Prodan ◽  
E.S. Kikkinides ◽  
...  
Keyword(s):  
Low Temperature ◽  
Research Work ◽  
Argon Atmosphere ◽  
Phase System ◽  
Microstructural Properties ◽  
Two Phase ◽  
Hydrogen Activation ◽  
Arc Melting ◽  
Main Component ◽  
Type Apparatus

The goal of our studies is to find alloy compositions capable of high H capacity and reversible low temperature hydrogenation. In the present research work, specimens with nominal compositions Zr0.9Ti0.1Cr1.2V0.8 and Zr0.9Ti0.1Cr0.8V0.8Ni0.4 have been prepared by arc–melting under argon atmosphere. The microstructural properties of the samples were analyzed by XRD and SEM, while the corresponding microchemistry was determined by EDAX measurements. A two phase system was regularly obtained, with the main component being the hexagonal (C14) Laves phase. The presence of small amounts of Ni has been found to increase the alloy activity on hydrogen. Hydrogen activation was performed for both samples and charging-discharging properties were investigated in the temperature range between 20 oC and 100 oC by using a Sievert-type apparatus.

Low-temperature catalytic oxidative desulfurization by two-phase system with O-bridged diiron perfluorophthalocyanine

Fuel ◽  
2021 ◽  
Vol 306 ◽  
pp. 121649
Author(s):  
Ze Fang ◽  
Zhiguo Zhao ◽  
Nan Li ◽  
Zhexin Zhu ◽  
Wangyang Lu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Oxidative Desulfurization ◽  
Phase System ◽  
Two Phase ◽  
Catalytic Oxidative Desulfurization

scholarly journals Investigation of Reagents with Different Chemical Compositions for Protection of Oil Primary Refining Equipment

2010 ◽  
Vol 4 (3) ◽  
pp. 231-236
Author(s):  
Petro Topilnytsky ◽  
◽  
Victoria Romanchuk ◽  
Keyword(s):  
Low Temperature ◽  
Corrosion Inhibitors ◽  
Phase System ◽  
Chemical Compositions ◽  
Polar Solvents ◽  
Two Phase ◽  
Nitrogen Containing Compounds ◽  
Refining Equipment

The article deals with the investigation results of nitrogen-containing compounds solubility in non-polar and polar solvents, as well as low-temperature properties of formed solutions and their anticorrosive properties as corrosion inhibitors in the hydrocarbon-water two-phase system.

Influence of Casting Mold Slag on the Progress of Casting Process / Wpływ Własnosci Zuzla Krystalizatorowego Na Przebieg Procesu Odlewania

2013 ◽  
Vol 58 (1) ◽  
pp. 35-41 ◽  
Author(s):  
D. Kalisz
Keyword(s):  
Research Work ◽  
Casting Process ◽  
Liquid Solution ◽  
Experimental Results ◽  
Phase System ◽  
Main Function ◽  
Concentric Cylinder ◽  
Two Phase ◽  
Model Calculations ◽  
Mold Slag

This paper analysis one of the basic properties of liquid slag which is viscosity. The slag in the mold fills there is between the wall and the ingot mold, where it occurs in the form of a thin layer of solidified and molten slag. The main function is to lubricate the walls of the crystallizer and control of the heat transport from the solidifying steel. The research work carried out by concentric cylinder viscosity for five samples of slag for use in industrial environments. The study was conducted for the temperature range 1200-1550°C. Then the experimental results were compared with model calculations. The differences between the experimental results and the model calculations are related to the construction of the slag and the assumptions. Measurements under laboratory conditions on the two-phase system: a liquid solution of the dispersed phase ion steel - carbon, whereas the calculation model are the liquid-phase, and therefore the viscosity calculated values are lower than the values measured.

Low temperature and low toxicity synthesis of highly luminescent CdSe/CdS core–shell nanocrystals in a two-phase system

CrystEngComm ◽  
2011 ◽  
Vol 13 (16) ◽  
pp. 5243 ◽  
Author(s):  
Xiaobo Ma ◽  
Wei Nie ◽  
Daocheng Pan ◽  
Xiangling Ji ◽  
Ce Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Core Shell ◽  
Phase System ◽  
Two Phase ◽  
Low Toxicity

Supercritical carbon dioxide behavior in porous silica aerogel

2010 ◽  
Vol 44 (1) ◽  
pp. 43-51 ◽  
Author(s):  
Salvino Ciccariello ◽  
Yuri B. Melnichenko ◽  
Lilin He
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Small Angle ◽  
Silica Aerogel ◽  
Small Angle Neutron Scattering ◽  
Scattering Length ◽  
Porous Silica ◽  
Phase System ◽  
Two Phase ◽  
Silica Wall

Analysis of the tails of the small-angle neutron scattering (SANS) intensities relevant to samples formed by porous silica and carbon dioxide at pressures ranging from 0 to 20 MPa and at temperatures of 308 and 353 K confirms that the CO2fluid must be treated as a two-phase system. The first of these phases is formed by the fluid closer to the silica wall than a suitable distance δ and the second by the fluid external to this shell. The sample scattering-length densities and shell thicknesses are determined by the Porod invariants and the oscillations observed in the Porod plots of the SANS intensities. The resulting matter densities of the shell regions (thickness 15–35 Å) are approximately equal, while those of the outer regions increase with pressure and become equal to the bulk CO2at the higher pressures only in the low-temperature case.

Effect of V Substitution on the Composite Zr-Ti-Cr-V-Ni Intermetallic Hydrides

2010 ◽  
Vol 636-637 ◽  
pp. 887-894 ◽  
Author(s):  
Sofoklis S. Makridis ◽  
A. Ioannidou ◽  
Erik Zupanič ◽  
Albert Prodan ◽  
E.S. Kikkinides ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
Research Work ◽  
Rietveld Analysis ◽  
Argon Atmosphere ◽  
Dendritic Microstructure ◽  
X Ray ◽  
Volumetric Density ◽  
Arc Melting ◽  
Activation Procedure ◽  
Low Pressures

Hydrogen storage in reversible metal hydrides is attractive because it can be stored at relatively low pressures with a high volumetric density. In the present research work have been investigated compounds with nominal compositions Zr0.8Ti0.2Cr1.2V0.4Ni0.4 and Zr0.8Ti0.2Cr0.8V0.8Ni0.4 that have been prepared by arc-melting under argon atmosphere. Structural characteristics have been studied by using X-ray powder diffraction while the patterns have been analyzed by using the Rietveld analysis. A main hexagonal Laves phase MgZn2 (C14) and a secondary MgCu2 (C15)-type of, have been found in the powdered compounds. The bulk samples have composite microstructures but the V-rich is characterized by a dendritic microstructure. The high resolution scanning electron microscopy (HR-SEM) and energy dispersive X-ray analysis (EDAX) have been used for the morphology and quantitative analysis, respectively. Hydrogenations and dehydrogenations have been obtained after crucial activation procedure. The alloys were found to be more active under hydrogen after activation while the desorbed amount of hydrogen has been measured by using a Sievert-type apparatus.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

A Comparison of Tem and Apfim to the Interpretation of Modulated Microstructures

1985 ◽  
Vol 43 ◽  
pp. 70-71
Author(s):  
M.G. Burke ◽  
M.K. Miller
Keyword(s):  
Low Temperature ◽  
Microstructural Characterization ◽  
Superlattice Reflection ◽  
High Volume ◽  
Atom Probe ◽  
Dark Field ◽  
Miscibility Gap ◽  
Second Phase ◽  
Two Phase ◽  
Probe Field

Interpretation of fine-scale microstructures containing high volume fractions of second phase is complex. In particular, microstructures developed through decomposition within low temperature miscibility gaps may be extremely fine. This paper compares the morphological interpretations of such complex microstructures by the high-resolution techniques of TEM and atom probe field-ion microscopy (APFIM).The Fe-25 at% Be alloy selected for this study was aged within the low temperature miscibility gap to form a <100> aligned two-phase microstructure. This triaxially modulated microstructure is composed of an Fe-rich ferrite phase and a B2-ordered Be-enriched phase. The microstructural characterization through conventional bright-field TEM is inadequate because of the many contributions to image contrast. The ordering reaction which accompanies spinodal decomposition in this alloy permits simplification of the image by the use of the centered dark field technique to image just one phase. A CDF image formed with a B2 superlattice reflection is shown in fig. 1. In this CDF micrograph, the the B2-ordered Be-enriched phase appears as bright regions in the darkly-imaging ferrite. By examining the specimen in a [001] orientation, the <100> nature of the modulations is evident.

On the Problem of “Two-Phase” Activated Sludge

1991 ◽  
Vol 24 (7) ◽  
pp. 59-64 ◽  
Author(s):  
R. W. Szetela
Keyword(s):  
Activated Sludge ◽  
Single Phase ◽  
Phase System ◽  
Two Phase ◽  
Wastewater Treatment Process ◽  
Sludge Stabilization ◽  
Technological Advantage ◽  
In Series ◽  
State Models ◽  
Activated Sludge Systems

Steady-state models are presented to describe the wastewater treatment process in two activated sludge systems. One of these makes use of a single complete-mix reactor; the other one involves two complete-mix reactors arranged in series. The in-series system is equivalent to what is known as the “two-phase” activated sludge, a concept which is now being launched throughout Poland in conjunction with the PROMLECZ technology under implementation. Analysis of the mathematical models has revealed the following: (1) treatment efficiency, excess sludge production, energy consumption, and the degree of sludge stabilization are identical in the two systems; (2) there exists a technological equivalence of “two-phase” sludge with “single-phase” sludge; (3) the “two-phase” system has no technological advantage over the “single-phase” system.

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