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Displaying records 981 to 990 of 1000 records.
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981. Elucidating Thermo-Mechanical Spallation of Thermal Barrier Coating-Systems Using Controlled Indentation Flaws
Topic: Ceramics
Published: Date unknown
Authors: M Bartsch, B Baufeld, Lin-Sien H Lum
Abstract: ramic thermal barrier coatings (TBC) can exhibit premature in-service failure due to spallation as a consequence of exposure to elevated temperatures, aggressive environments, and cyclic loading. Lifetime assessment for TBC-systems requires methods ...

982. Engineering of Self-Assembled Domain Architectures With Ultra-High Piezoelectric Response in Epitaxial Ferroelectric Films
Topic: Ceramics
Published: Date unknown
Authors: J.H. Yang, Julia Slutsker, Igor Levin, D H Kim, Chang-Beom Eom, R Ramesh, Alexander Lazar Roytburd
Abstract: Non-180 domain wall movement, which makes a large contribution to the piezoelectric response of ferroelectric bulk materials, were found to be much more difficult in epitaxial films, because of substrate clamping and inter-domain pinning. Through th ...

983. Enhancement of Mercuric Iodide Detector Performance Through Crystal Growth in Microgravity: The Roles of Lattice Order
Topic: Ceramics
Published: Date unknown
Authors: B W Steiner, L van den Berg, U Laor
Abstract: The hole mobility and carrier lifetime of [alpha] mercuric iodide high energy radiation detectors have been enhanced through crystal growth in microgravity. The improvement is closely correlated with specific characteristics of the crystal lattice, ...

984. Enhancement of Mercuric Iodide for High Energy Radiation Detectors via Diffraction Imaging
Topic: Ceramics
Published: Date unknown
Authors: B W Steiner, P L'Hostis, U Laor, L van den Berg
Abstract: NASA=S interest in tracing the structural origins of the superior electronic performance of mercuric iodide crystals grown in microgravity has led to an unusually productive series of imaging experiments at Brookhaven. High resolution diffraction i ...

985. Enviromental Concerns Facing the Ceramics Industry
Topic: Ceramics
Published: Date unknown
Author: Stephen Weil Freiman
Abstract: Over the past few years, there has been increased attention paid by ceramic manufacturers in the United States to environmental issues facing their businesses. In a recent survey of its members, the environment was identified as the primary issue fa ...

986. Environmentally Enhanced Crack Growth in AlN
Topic: Ceramics
Published: Date unknown
Authors: Roy W Rice, C Cm Wu, K R McKinney, Stephen Weil Freiman, L E Dolhert, J H Enloe
Abstract: Three tests: (1) dynamic fatigue; (2) flexure strength, and (3) direct, double-cantilever beam stress intensity-crack velocity measurements carried out in air (22 C) and liquid nitrogen (-196 C) all showed that dense sintered AlN undergoes slow crack ...

987. Estimation of Ion Exchange Layers for Soda-Lime Silicate Glass From Curvature Measurements
Topic: Ceramics
Published: Date unknown
Authors: Theo Fett, J -. Guin, Sheldon Martin Wiederhorn
Abstract: In glasses that contain mobile alkali ions, an ion exchange between protons or hydronium ions in the surrounding aqueous liquid and alkali ions in the glass causes a surface stress to develop in the glass. These surface stresses are responsible for ...

988. Estimation of Tensile Creep Parameters from Flexural and Compressive Creep of a Silicon Carbide and of a Silicon Carbide Whisker-Reinforced Alumina
Topic: Ceramics
Published: Date unknown
Author: Ralph Krause
Abstract: Secondary creep in tension was characterized by power-law functions of stress that were evaluated from load-point displacement on four-point flexure specimens and published compressive creep data for two ceramic materials. The flexural creep of 99 % ...

989. Experimental Determination of Chemical Hydridization in Rutile TiO^d2^ Using Site-Specific X-Ray Photoelectron Spectroscopy
Topic: Ceramics
Published: Date unknown
Authors: Joseph C Woicik, E J. Nelson, L Kronik, M Jain, J R Chelikowsky, D Heskett, L E Berman, G S Herman
Abstract: X-ray photoelectron spectroscopy (XPS) has emerged as a premier method by which to study the chemical bonding in solids. Owing to the conservation of energy between the incident photon and the ejected photoelectron, XPS has provided much direct and ...

990. Experts Evaluate Pulsed Laser Deposition Technology
Topic: Ceramics
Published: Date unknown
Authors: John W Hastie, D W Bonnell, D Chrissey
Abstract: The National Institute of Standards and Technology (NIST, Gaithersburg, MD) and The Naval Research Laboratory (NRL, Washington, DC) jointly hosted a workshop entitled Pulsed Laser Deposition (PLD) Technological Barriers: Research Needs and Opportunit ...

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