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Materials

Ceramics

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Displaying 451 - 475 of 1323

Bulk Silicon Is Susceptible to Fatigue

November 19, 2007
Author(s)
Sanjit Bhowmick, Juan J. Melendez-Martinez, Brian R. Lawn
It has long been held that bulk silicon is immune from fatigue. We present contrary evidence demonstrating severe fatigue in macroscale cracks produced in cyclic loading of single-crystal silicon with a sphere indenter. The key ingredient is a component of

Nothing is Brittle at the Nanoscale

November 15, 2007
Author(s)
Pradeep N. Namboodiri, Doo-In Kim, Jaroslaw Grobelny, T Hawa, B Henz, Michael R. Zachariah
Fracture of nanoscale contacts formed between spherical probes and flat samples is studied using an atomic force microscope (AFM) in ultra high vacuum environment. Analysis of the nonlinear elastic behavior observed during the fracture process in the force

Growth of Silicon Carbide Nanowires by a Microwave Heating-Assisted Physical Vapor Transport Using Group VIII Metal Catalysts

November 13, 2007
Author(s)
Siddarth Sundaresan, Albert Davydov, Mark D. Vaudin, Igor Levin, James E. Maslar, Yong-lai Tian, M V. Rao
SiC nanowires are grown by a novel catalyst-assisted sublimation-sandwich (SS) method. This involves microwave heating-assisted physical vapor transport from a source 4H-SiC wafer to a closely positioned substrate 4H-SiC wafer. The substrate wafer is

Pulsed Laser Deposition and Characterization of Hf-based High-k Dielectric Thin Films

October 26, 2007
Author(s)
Joseph C. Woicik, M A. Sahiner, Timothy Kurp, Jeffrey Serfass, Marc Aranguren
The continuous downward scaling of the complementary metal oxide semiconductor (CMOS) devices has enabled the Si-based semiconductor industry to meet the technological requirements such as high performance and low power consumption. However, the ever

Crack Propagation Across an Adhesive Interlayer in Flexural Loading

October 8, 2007
Author(s)
James J. Lee, H Chai, Isabel K. Lloyd, Brian R. Lawn
Crack propagation across interlayers separating adjoining brittle plates in flexure is studied using a model glass/epoxy/glass system. A transverse starter crack in the center glass plate is made to propagate to the nearest epoxy interface, where it
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