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Materials Science and Engineering
Missouri University of Science and Technology
Materials Science and Engineering Faculty Research & Creative Works
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Articles 1 - 8 of 8
Full-Text Articles in Engineering
Superplastic Forming Of Micro Components, Rajiv S. Mishra
Superplastic Forming Of Micro Components, Rajiv S. Mishra
Materials Science and Engineering Faculty Research & Creative Works
A method for forming a miniaturized shaped component. Bulk superplastic material is contacted with a flat rotating surface of a rotating tool to frictionally heat the bulk superplastic material with the bulk superplastic material positioned between the flat rotating surface of the tool and a micro fabricated tool die. The bulk superplastic material is forced into the microfabricated die once the bulk superplastic material is heated to a temperature between a glass transition temperature and a crystallization temperature.
Self-Consistent Modification To The Electron Density Of States Due To Electron-Phonon Coupling In Metals, Fatih Dogan, Frank Marsiglio
Self-Consistent Modification To The Electron Density Of States Due To Electron-Phonon Coupling In Metals, Fatih Dogan, Frank Marsiglio
Materials Science and Engineering Faculty Research & Creative Works
The "standard" theory of a normal metal consists of an effective electron band which interacts with phonons and impurities. The effects due to the electron-phonon interaction are often delineated within the Migdal approximation; the properties of many simple metals are reasonably well described with such a description. On the other hand, if the electron-phonon interaction is sufficiently strong, a polaron approach is more appropriate. The purpose of this paper is to examine to what degree the Migdal approximation is self-consistent, as the coupling strength increases. We find that changes in the electron density of states become significant for very large …
Optical And Electrical Properties Of Pr0.8sr0.2mno3 Thin Films, Toshio Suzuki, Piotr Z. Jasinski, Vladimir Petrovsky, Xiao Dong Zhou, Harlan U. Anderson
Optical And Electrical Properties Of Pr0.8sr0.2mno3 Thin Films, Toshio Suzuki, Piotr Z. Jasinski, Vladimir Petrovsky, Xiao Dong Zhou, Harlan U. Anderson
Materials Science and Engineering Faculty Research & Creative Works
The optical and electrical properties of Pr0.8Sr0.2MnO3 thin films were discussed. It was found that the results of optical measurements were correlated with the annealing temperatures of the films and the shape of the optical spectra was found to change as the structure changed from an amorphous to crystalline structure. the electrical conductivity was found to be observed to be about three orders of magnitude higher for specimens which were crystalline as compared to amorphous.
Electron Microscopy Studies On Platinum-Ceramics Nanocomposites Synthesized By Spray Process, X.-D. Zhou
Electron Microscopy Studies On Platinum-Ceramics Nanocomposites Synthesized By Spray Process, X.-D. Zhou
Materials Science and Engineering Faculty Research & Creative Works
The platinum-ceramics nanocomposites synthesized by spray process were discussed using electron microscopy. It was found that the nanocomposites of Pt-ceramics were synthesized by spray process with a controllable distribution of Pt primary particles. the analysis showed that the nanometer Pt primary particles encapsulating YSZ nanocomposites were derived when ethanol was used as solvent.
Dynamics Of Bulk And Adsorbed Poly(Vinyl Acetate), Frank D. Blum, Robert D. O'Connor
Dynamics Of Bulk And Adsorbed Poly(Vinyl Acetate), Frank D. Blum, Robert D. O'Connor
Materials Science and Engineering Faculty Research & Creative Works
We have recently completed a series of experiments on methyl-labeled poly(vinyl acetate)-d3, (PVAc-d3)1 and poly(methyl acrylate)-d3 (PMA-d3).234 the systems have been studied as a function of the adsorbed amount, molecular weight, and presence of a protonated overlayer. Using deuterium line shape analysis, we have found that around the glass transition temperature, the adsorbed polymers show the presence of a motional gradient. Polymer segments near the silica-polymer interface have less mobility than the bulk polymer and those near the polymer-air interface are more mobile than those of the bulk polymer. A schematic representation of the motional gradient is shown in Figure …
Neodymium Oxide Doped Melt Textured Yba₂Cu₃O₇₋ₓ Single Crystals, Fatih Dogan, Stephen W. Sofie, Michael Strasik, Kevin E. Mccrary, Arthur C. Day, William C. Hicks
Neodymium Oxide Doped Melt Textured Yba₂Cu₃O₇₋ₓ Single Crystals, Fatih Dogan, Stephen W. Sofie, Michael Strasik, Kevin E. Mccrary, Arthur C. Day, William C. Hicks
Materials Science and Engineering Faculty Research & Creative Works
Processing, microstructure and property relationships in neodymium oxide doped high temperature superconducting YBa2Cu3O7-x (Y123) were investigated. It has been observed that a small amount (~ 0.25 - 1 mol%) of Nd2O3 results in the formation of nanosized secondary phases which may have a significant effect on the superconducting properties of melt textured Y123 single crystals. It was further observed that addition of Nd2O3 greater than 1 mol% leads to multiple nucleation during solidification of Y123 and results in polycrystalline samples. Melt textured single crystals of Y123 with < 1 mol% were successfully grown and characterized with respect to microstructural development and superconducting properties.
Influence Of Nanocrystalline Grain Size On The Breakdown Strength Of Ceramic Dielectrics, Yang Ye, Fatih Dogan, E. Schamiloglu, J. Gaudet, P. Castro, M. Roybal, M. Joler, C. Christodoulou, Shi C. Zhang
Influence Of Nanocrystalline Grain Size On The Breakdown Strength Of Ceramic Dielectrics, Yang Ye, Fatih Dogan, E. Schamiloglu, J. Gaudet, P. Castro, M. Roybal, M. Joler, C. Christodoulou, Shi C. Zhang
Materials Science and Engineering Faculty Research & Creative Works
In an effort to develop transmission lines with higher energy storage capabilities for compact pulsed power applications, the University of Missouri-Rolla (UMR) and the University of New Mexico (UNM) have undertaken a collaborative approach to developing and studying ceramic dielectrics. At UMR, the electrical breakdown strength (BDS) of TiO2-based materials is investigated for high energy density applications. The results of research to-date show that dense titania ceramics with nanocrystalline grain size (~200 nm) exhibit significantly higher BDS as compared to ceramics made using coarse grain materials. Processing-microstructure-property relationships in TiO2 systems are found to play a role with respect to …
In-Plane Anisotropy And Temperature Dependence Of Oxygen Phonon Modes In Yba₂Cu₃O₆.₉₅, Jaeho Chung, Takeshi Egami, R. J. Mcqueeney, Mohana Yethiraj, Masatoshi Arai, Tetsuya Yokoo, Yu Nikolaijevitsch Petrov, Herbert A. Mook, Yasuo Endoh, Setsuko Tajima, Christopher D. Frost, Fatih Dogan
In-Plane Anisotropy And Temperature Dependence Of Oxygen Phonon Modes In Yba₂Cu₃O₆.₉₅, Jaeho Chung, Takeshi Egami, R. J. Mcqueeney, Mohana Yethiraj, Masatoshi Arai, Tetsuya Yokoo, Yu Nikolaijevitsch Petrov, Herbert A. Mook, Yasuo Endoh, Setsuko Tajima, Christopher D. Frost, Fatih Dogan
Materials Science and Engineering Faculty Research & Creative Works
Inelastic pulsed neutron scattering measurements on YBa2Cu3O6.95 single crystals indicate that the sample has a distinct a-b plane anisotropy in the oxygen vibrations. The Cu-O bond-stretching-type phonons, which are suspected to interact strongly with charge, are simultaneously observed along the a and b directions due to a 7-meV splitting arising from the orthorhombicity, even though the sample is twinned. The bond-stretching LO branch with the polarization along a (perpendicular to the chain) loses intensity beyond the middle of the zone, indicating branch splitting as seen in doped nickelates, with the second branch being located at …