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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"ternary alloys"”.
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Nanoscale self-organization in irradiated ternary alloys
Microstructural stability of nanostructured alloys under harsh environments such as high temperatures and high dose irradiation is a primary concern in the deployment of those materials for engineering applications. This thesis work explores several pathways to stabilize nanostructures in Cu-based …
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Palladium, yttrium, copper ternary alloys for hydrogen purification
… Alloying with different metals to produce binary alloys has been shown to further improve many of its essential properties significantly. Currently palladium-silver alloys are used commercially for the hydrogen purification process, however, other binary alloys have also been shown to …
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Design of stable nanostructure configurations in ternary alloys
The development of stable nanocrystalline binary alloys, which possess a large volume fraction of grain boundaries at elevated temperatures, is a promising route to high yield strength materials. Previous studies have focused on alloying by selecting solute elements that segregate at grain …
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Undercooling and rapid solidification of Fe-Cr-Ni ternary alloys
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Sn-Sb-Se based binary and ternary alloys for phase change memory applications
… used in PCRAM prototypes are pseudo-binary alloys based on GeTe and Sb2Te3. Among these, Ge2Sb2Te5 has received most attention since it shows fast crystallization speed, high electrical resistivity contrast between the amorphous and crystalline states, high number of overwrite cycles, and …
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Spin and Carrier Relaxation Dynamics in InAsP Ternary Alloys, the Spin-orbit-split Hole Bands in Ferromagnetic InMnSb and InMnAs, and Reflectrometry Measurements of Valent Doped Barium Titanate
… The first class of the materials were the ternary alloys InAsP. The electron g-factor of InAsP can be tuned, even allowing for g=0, making InAsP an ideal candidate for quantum communication devices. Furthermore, InAsP shows promises for opto-electronics and spintronics, where the …
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TDDFT calculations for excitation spectra of solids and superstructures utilizing mGGA
… , inorganic semiconductors and semiconductor alloys. In this work, we start from the Kohn-Sham one-particle equation Schr¨odinger equation and solve it by expanding its eigenfunctions in terms of the linear augmented-slater-type orbits(LASTO) under full potential with the exchange-correlation …
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The Cr₃O-type compound in the niobium-rhodium-silicon ternary system
… compositions across the niobium-rhodium- silicon ternary diagram from Nb₃Rh to 75 atomic percent niobium-25 percent silicon, were prepared by arc-melting compacts of high-purity powders. Both x-ray diffractometer and camera techniques were used to analyze the resulting structures. No measurable …
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Estudo teórico da cinética do primeiro estágio de grafitização de um ferro maleável perlítico com o acompanhamento de sua morfologia no microscópio eletrônico de varredura
The cast irons are ternary alloys of iron, carbon and silicon, that have good mechanical properties. The malleable cast irons are obtained by a heat treatment called "malleabilization", from a white cast iron of a specific composition. The work was based on the theoretical study of the kinetics of …
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Continuous production of supported and shaped metal nanocatalysts using conveyor transport system
… shaped carbon-supported Pt-M (M=Ni, Co, Fe) alloys were also generated using the same technique, demonstrating the capability of this system for generating bimetallic or potentially ternary alloys with controlled size and shape. This system was further applied to core-shell nanoparticles, and …
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Application Of Scanning Hall Probe Microscopy For High Throughput Characterization Of Combinatorial Magnetic Materials
… studied phase diagrams of Co-Fe-Ni binary and ternary alloys, as well as weak itinerant ferromagnet MnSi. The Co-Fe-Ni alloys were fabricated by annealing three metal blocks placed in intimate contact at high temperatures to allow thermal interdiffusion to create solid-solution with a …
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Mechanism of the NiCoFe ternary alloy deposition
Electrodeposited NiCoFe ternary alloys are of interest for their magnetic and thermophysical properties. The reaction rates and resulting composition and current efficiency are often determined empirically, due to a lack of understanding of the electrodeposition mechanism and coupled mass …
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Multimetallic Nanoparticles For Fuel Cell Electrocatalysts: Considerations Of Their Formation And Thin-Film Inspired Compositions
… several multimetallic systems (both disordered alloys and ordered intermetallics) that are potential candidates for improved anode and cathode electrocatalysts. However, if those complex metallic materials are to be used as fuel cell electrocatalysts, they must be prepared as high surface area …
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First-principles approach to screening multi-component metal alloys for hydrogen purification membranes
… operational standards, and be cost effective. Alloys offer an alternate route in improving upon membranes based on pure metal such as Pd. Development of new membranes is hampered by the large effort and time required not only to experimentally develop these membranes but also to properly test …
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Mechanical, electronic and optical properties of multi-ternary semiconductor alloys
… tunable properties with composition makes multi-ternary alloys extremely useful for a variety of applications in semiconductor devices and is of significant interest in experimental and theoretical research. This dissertation investigates the mechanical, electronic and optical properties of …
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Nanostructure Characterization, Fabrication and Devices of 2D Mos2 and Mos2/WS2 Hetrostructures
… found is 200ppm. In-addition one step growth of ternary alloys Mo1-xWxS2 has been achieved by LPCVD. Different compositions of W in MoS2 have been investigated by micro-photoluminescence and micro-Raman spectroscopy. In-plane heterojunctions of atomic-thick (2D) semiconductors (MoS2/WS2) are …
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Study of gold-based alloy phase diagrams
… partial constitutions of the Au-Ge-X and Au-Pb-X ternary alloys have been investigated, where X is a metallic element, selected from the sub-groups period 1m and rrm of the periodic table (In, Ga, Zn, or Cd), which forms one or more stable compounds with gold, but which forms no stable compound …
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Lattice-mismatched epitaxy of AlInP and characterization of its microstructure and luminescence
The synthesis of high-quality III-V ternary alloy semiconductors is vital to the success of major technologies such as LEDs, laser diodes, high-efficiency solar cells and power electronics. However, the epitaxy of ternary alloys can be complicated due to the dissimilar behavior of constituent atoms …
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EFFECTS OF SIZE AND COMPOSITION ON THE PERFORMANCE OF DEALLOYED NANOPOROUS METAL CATALYSTS FOR CO2 REDUCTION, O2 EVOLUTION, AND H2 GENERATION
… effect, my studies using nanoporous Ni-Fe-Mn ternary alloys with varying compositions show that there exist an optimal Ni/Fe ratio (Ni/Fe = 2) which exhibits optimal activity towards O2 evolution. Next, based on these findings on the structure-performance relations, I propose approaches to …
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Reaction and transport processes in OMCVD : selective and group III-nitride growth
… mechanism is proposed for InN growth in InGaN ternary alloys. In agreement with multiple experimental observations, the indium content appears to be controlled by competition between desorption kinetics and incorporation, the latter being determined by the GaN growth rate since InN is not …
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