2 edition of paramagnetic properties of some Pd- and PdH-based alloys in the temperature region 77-300⁰ K. found in the catalog.
paramagnetic properties of some Pd- and PdH-based alloys in the temperature region 77-300⁰ K.
S. G. Humble
Bibliography: p. 614.
|Statement||[By] S. G. Humble.|
|Series||Arkiv för fysik,, bd. 37, nr. 41|
|LC Classifications||QC1 .S923 bd. 37, nr. 41|
|The Physical Object|
|Number of Pages||614|
|LC Control Number||76391917|
Finally, the as-deposited Pd-Cu/ZrO 2-PSS composite membrane was annealed in hydrogen at K for h in order to form a homogeneous palladium-copper alloy film by thermal diffusion. XPS analyses showed the average surface composition of the two membranes were respectively Pd 90 Cu 10 and Pd 59 Cu 41 (mass fraction/%). Au–Pd alloy catalysts with high catalytic activity. In this work, we demonstrate the use of the room-temperature elec-tron reduction for the preparation of Pt–Pd alloy NPs with very small size supported on carbon. The size of obtained alloy NPs is only nm and the alloy NPs feature a core–shell structure. 30% Ag at K. Also, the solubility of PdAu alloys was higher than pure Pd with a maximum at about 20% Au with a solubility 12 times higher than that of pure Pd. It was found that for a % H concentration in a PdAg alloy, a cell expansion of % occurs, which if ignored may affect the individual binding. Biomedical Microdevices , –, C SpringerScience+BusinessMedia,cturedinTheNetherlands. Characterization of Polydimethylsiloxane (PDMS) Properties for Biomedical Micro/Nanosystems Alvaro Mata,1, 2Aaron J. Fleischman, and Shuvo Roy2,∗ 1Department of Chemical and Biomedical Engineering, Cleveland .
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The magnetic properties of the Pd–Pt alloys were measured between and K with a Manics DSM 8 magnetosusceptometer. The low temperature measurements (– K) were performed with an He flow Oxford cryostat and the high temperatures (– K) with a Manics oven.
The samples were small bulk pieces of – by: The mechanical and thermodynamical properties of Pd, Ag pure metals and especially Pd x Ag 1−x alloys are studied by using the molecular dynamics simulation.
The effects of temperature and concentration on the physical properties of Pd x Ag 1−x are analyzed. Sutton–Chen (SC) and quantum Sutton–Chen (Q-SC) many-body potentials are used as interatomic interactions which Cited by: Addition of Ag to Pd increases the mechanical stability, hardness, chemical inertness and hydrogen permeability [30,31].It is a good option for surface modification to gain high sensitivity towards H 2 detection.
In addition, surface segregation plays a vital role in H 2 adsorption and simultaneously the permeation properties of Pd-based alloy membrane [32,33].Cited by: 4.
With this method, we have made Au–Pd alloy catalysts with high catalytic activity. 20 In this work, we demonstrate the use of the room‐temperature electron reduction for the preparation of Pt–Pd alloy NPs with very small size supported on carbon.
The size of obtained alloy NPs is only nm and the alloy NPs feature a core–shell by: Ti-based alloys containing Ag were produced by tilt-casting method and their properties were studied.
Even in its as-cast state, Ti 94 Ag 3 Pd 3 showed relatively high tensile properties, good Cited by: With increasing annealing temperature, the CO TPD peak shifts to higher temperature (nearly linearly between and K annealing temperature).
After annealing at K, the desorption maximum is located at about K. For comparison, for CO desorption from a Ag 33 Pd 67 bulk alloy a single peak maximum was observed at the same temperature.
In this research, the thermodynamics of H2 solution and hydride formation in a series of disordered Pd−Ag alloys has been determined using both reaction calorimetry and equilibrium PH2−composition−T data.
Trends of ΔHH and ΔSH with both H and Ag concentration have been determined. For the PdAg alloy, which does not form a hydride phase, ΔHH and ΔSH both. Magnetic susceptibility and electrical resistivity measurements were performed (Pd x Co x) 80 P 20 alloys where 15 properties show that these alloys undergo a ferromagnetic transition between and K as the cobalt concentration increases from 15 to 50 atomic %.
Pd/Co MLs. However, the magnitude of surface H. Takahashi et al. /Magnetic properties of PdNi alloys and multilayers 0 fact, the magnetostriction of Pd/Ni ( A) 31 at x NMLs at room temperature is about one third of a 37 Pd/Co ML with a similar layer structure. \K. Samples of the ternary alloys and a Pd foil were mounted horizontally in a tube furnace.
Then, they were heated from room temperature to K at 1Kmin1 in a ﬂow of high purity argon (40 ml/min). Next, the samples were treated in ﬂowing hydrogen (10 ml/min, high purity) at K for 30 min, followed by a mixture of ppm H 2S/H 2 (10 ml. By making use of a new experimental fact that the number of electrons in the 5 s -band or the number of holes in the 4 d -band is per atom for Pd metal, the composition dependence of the magnetization of Pd-Fe and Pd-Co alloys is discussed, and residual electric resistivities for Ni-Pd alloys are the density of states curve which has been determined.
from the low. Measurements of the Hall coefficient have been made, from to K, for Pd and some β-phase PdH alloys. The results for Pd have a temperature dependence of a form which is given quite well by the model of Kimura and Shimizu.
The results for the alloys show an anomaly at 50 K, and a time dependence below this temperature, which is similar to that shown by the electrical resistivity.
2 at 77 K. The H adatom binds to Pd−Au alloy sites more strongly than to Au() but more weakly than to Pd() as indicated by its desorption temperature (∼ K).
With hydrogen exposure at slightly higher temperatures (i.e., − K), extension of a low-temperature desorption feature was observed. In the alloys containing 10 and 20 at% Pd, Δ\ ildeQ=\ ildeQ(ferromagnetic region)−\ ildeQ(paramagnetic region) has been shown to be and kcal/mol, respectively.
Using the thermodynamic data by Bidwell et al., the thermodynamic factor in Darken’s equation has been calculated, and the contribution of it to the apparent activation. Ti-based alloys containing Ag were produced by tilt-casting method and their properties were studied.
Even in its as-cast state, Ti 94 Ag 3 Pd 3 showed relatively high tensile properties, good electrochemical behavior, and good biocompatibility. The relatively good mechanical properties of the as-cast α-Ti-type Ti 94 Ag 3 Pd 3 alloy (tensile strength up to MPa and elongation of ~10%) can.
properties of these Cu-Pd alloys have been under-taken and have resulted in the development of ternary Cu-Pd-Ni alloys with a nearly zero temper-ature coefficient of electrical resistivity over a wide temperature interval.
Alloys Pd-Cu-Au and Pd-Cu-Ag have also been developed and are in use; their yield stresses are in the range to MPa. Bulk amorphous Pd–Ni–Fe–P alloys: Preparation and characterization - Volume 14 Issue 5 - T. Shen, Y. He, R. Schwarz. The chemisorptive behavior of CO on Pd−Au alloy films has been studied by infrared reflection−adsorption spectroscopy (IRAS).
Geometric (ensemble) and electronic (ligand) effects have been addressed by comparing the results with the corresponding single-component systems. A unique CO vibrational feature at cm-1 is associated with CO adsorption on isolated Pd sites.
Structure and physicomechanical properties of Cu–Pd alloys that contain – at % Pd have been studied. It has been shown that, in all alloys, a solid solution is formed; the lattice parameter of the fcc lattice and the electrical resistivity of the alloys grow linearly with an increase in the content of palladium.
It has also been revealed that the introduction of palladium leads to an. The chemisorptive behavior of CO on Pd−Au alloy films has been studied by infrared reflection−adsorption spectroscopy (IRAS). Geometric (ensemble) and electronic (ligand) effects have been addressed by comparing the results with the corresponding single-component systems.
A unique CO vibrational feature at cm-1 is associated with CO adsorption on isolated Pd sites. RAPIDLY SOLIDIFIED FERROUS ALLOYS • Eutectic compositions that permit cooling to a glass transition temperature at practically reachable quench rate ( and C°/s) – - rapidly solidified alloys • Boron, B, rather than carbon is a primary alloying element for amorphous ferrous alloys • Properties.
k φ ′r ikcr ikd r ik) ρ3 i). In our computations at each concentration and at each temperature we have ﬁrst determined the zero strain state, ho, of the system by performing constant-temperature and constant-stress simulations (NPT) at zero stress. This yields the reference shape and size matrix, ho in the Parrinello-Rahman () formalism.
For example, the permeabilities of a Pd()Ag() alloy membrane and a Pd()Y() alloy membrane are found to be nearly independent of temperature ( to K) in the range of constant.
composition, pressure, temperature, and oxygen fugacity. Since thermodynamic calculators are available to calculate the Fe activity in silicate liquids, the essential need is for an activity-composition model for Fe-Au-Pd alloys.
Here we present a calibration along a binary subsystem of this ternary, along the join from Fe to 75% Au, 25% Pd.
The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy. Acta Mater. 61, – () CAS Article Google Scholar. In this study, in-situ X-ray diffraction has been carried out to investigate the effect of temperature and pressure on hydrogen induced lattice parameter variation in size selected Pd-Ag and Pd-Cu alloy nanoparticles.
The nanoparticles of three different mobility equivalent diameters (20, 40, and 60 nm) having a narrow size distribution were prepared by gas phase synthesis method. Near-surface alloys. NSAs, defined as alloys wherein a solute metal is present near the surface of a host metal in a concentration that is different from the bulk, may form even when the bulk alloys are not thermodynamically stable. As a model system, NSAs provide clear atomic-level structural information related to how the electronic states of Pd and Ru vary by changing the atomic.
The aging in the temperature range from to °C occurred first, forming GP-zones with a hardness increase and then in overaging stage by forming discontinuous precipitation, which consisted of lamellae of solute (Pd, In, Zn) depleted Ag-rich phase and (Pd,Ag) 3 (In,Zn) intermetallic phase.
The hardness increased very fast to its peak in. annealing temperature in Fig. 3(c) and (d), respectively. This reveals that that, when annealing the 7 ML Au/ Pd() ﬁlm from to K, no drastic changes occur in the Au and Pd signal intensities.
Only after heating to K and higher, are signiﬁcant changes found (Fig. 3(c)). The binding energy of the Au 4f 7/2 Pd. binary alloys and Pt-Ni-Co, Pt-Ni-Fe, and Pt-Pd-Ni ternary alloys. Furthermore, we performed the Metropolis Monte Carlo (MC) simulations to accurately predict the surface segregation phenomena and surface composition profiles in these Pt alloys after annealing in vacuum.
In Fig. 1, we show the predicted surface composition profiles of three. The vapor pressure of palladium over nine Pd-Pt alloys was measured by the torsion-effusion method. Calorimetric heat-of-solution measurements were carried out on specimens from the same alloys to derive the enthalpy of formation.
The activities and partial and integral free energies at °K, computed from the vapor-pressure measurements, were combined with the integral enthalpies at °K. Introduction. The various metals and alloys have been widely used in science and technology. Many amorphous alloys, such as Fe-based amorphous alloys, possess superior magnetic properties compared to their crystalline counterparts because of their unique atomic structures .A great deal of effort has been devoted to iron series alloy nanoparticles because of the novel optical, catalytic.
Zinc and ZA Alloy Chemical Composition A Standard Zinc and ZA Alloy Properties A Standard Zinc and ZA Alloy Characteristics A Guidelines High Fluidity (HF) Properties and Composition 7 Selecting An Alloy Family 8 Quick Guide to Alloy Family Selection 9 Elevated Temperature Properties The development of Pd-based alloy catalysts for highly active and selective reduction of NO by CO was investigated.
A survey of Pd-based bimetallic catalysts (PdM/Al 2 O 3: M = Cu, In, Pb, Sn, and Zn) revealed that the PdIn/Al 2 O 3 catalyst displayed excellent N 2 selectivity even at low temperatures (% at °C). The catalytic activity of PdIn was further improved by substituting a part.
Rh is an important element that exhibits excellent activity in numerous catalytic reactions 1,2,3,4,5,6,r, the abundance of Rh is only one-fifth of Pt and it is one of the least abundant. Metalization of the S-layer. For sorption of Pd (II), the protein was dialyzed against H 2 O and 10 mg of it were incubated in ml of a solution of 2 mM Na 2 PdCl 4 (pH = ), which was prepared 24 h before the use and kept in the dark.
After 3 h of incubation at room temperature under shaking in the darkness, the sample was centrifuged and the pellet was resuspended in H 2 O.
The method of simulating H diffusion in Pd-based alloys is more complex than that of pure Pd. The ﬁrst step is to simulate an accurate structure of a given Pd alloy with regard to the relative arrangement of Pd and Ag or Au atoms in the lattice and the type of crystal lattice from which these atoms are distributed.
Methods Density Functional Theory – DACAPO total energy code 1,2 Periodic self-consistent PWGGA 3 Ultra-soft Vanderbilt pseudo-potentials 4 Plane wave basis sets with Ry kinetic energy cut-off Spin polarization as needed Four-metal-layer slabs; (2x2) unit cell; top two layers relaxed First Brillouin zone sampled at 18 k-points Nudged Elastic Band method for reaction paths 5.
Electrochemical corrosion may instigate these reactions. METHODS: Four groups of alloys, Pd-Cu, Pd-Ga-(with and without Ag), Pd-Ag, and Au-Pd, were evaluated by traditional corrosion measurement techniques in a phosphated buffer saline solution at 20 degrees C.
As the properties of thin films depend strongly on their structure, composition and purity, we propose to condense silver-palladium alloy films onto single-crystal substrates by glow discharge sputtering.
In a previous paper  we have shown that epitaxial films of Ag, Pd and AgPd alloys deposited onto NaCI were chloride contaminated. The present work investigates both the diffusivity and permeability of hydrogen (H) in palladium-silver (PdAg) and palladium-gold (PdAu) alloys over a – K temperature range for Pd − X M X, M = Ag or Au and X = 0 % – 48 % using density functional theory (DFT) and kinetic Monte Carlo simulations (KMC).
DFT has been employed to obtain octahedral (O)- tetrahedral (T)-. The structural stability and thermodynamic properties of core–shell nanoparticles (NPs) are very important for their applications.
In this work, the bond energy (BE) model, originally for cohesive energy of pure NPs, has been generalized to core–shell nanosolids.
The core–shell NPs can be divided into three regions: the core, the interface, and the shell. A basic resin bearing −N(CH3)2 functional groups within its macroreticular structure performed as an efficient organic support for the active Pd nanoparticles (NPs) responsible for the production of high-quality H2 via formic acid (HCOOH) decomposition at convenient temperature.
Physicochemical characterization as well as the kinetic isotope effect (KIE) revealed that not only the .