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Displaying 1326 - 1350 of 1729

Crack Growth in Sapphire

January 1, 2002
Author(s)
Sheldon M. Wiederhorn, Ralph Krause
Crack growth was studied in sapphire on both the m-plane and the r-plane (rhombohedral twin plane). Crack growth on the m-plane fit a power law function of stress intensity factor and an Arrhenius function of temperature. Crack growth on r-plane double

Formation of SEI on Cycled Lithium-Ion Battery Cathodes: Soft X-ray Absorption Study

January 1, 2002
Author(s)
Mahalingam Balasubramanian, H S. Lee, X Sun, Xiao-Qing Yang, A R. Moodenbaugh, James McBreen, Daniel A. Fischer, Ziwen Fu
The formation of a solid electrolyte interface (SEI) on LiNi 0.85Co 0.15O 2 cathodes from lithium-ion cells cycled at 40EC and 70EC was observed and characterized using soft x-ray absorption spectroscopy (XAS). XAS measurements were made in the energy

Near-Field Optical Imaging of Microphase Separated and Semi-Crystalline Polymer Systems

January 1, 2002
Author(s)
Michael J. Fasolka, Lori S. Goldner, A Urbas, Jeeseong C. Hwang, Kathryn Beers, P DeRege, Evan L. Thomas
Polymer self-assembly presents an attractive means of creating the micro- and nano-patterned spatial arrays required for many opto-electronic and coatings technologies. Two of these ordering processes are microphase separation (MS), exhibited by block

Non-Cavitational Tensile Creep in Lu-Doped Silicon Nitride

January 1, 2002
Author(s)
F Lofaj, Sheldon M. Wiederhorn, Gabrielle G. Long, B Hockey, P R. Jemian, L Browder, April Andreas
The tensile creep behavior of a Lu-based silicon nitride, SN 281, was studied in the temperature range 1400 C to 1550 C with test periods of up to 10 000 h. Strain rates were 3 to 5 orders of magnitude less than those for Yb-based grades of silicon nitride

Phase Relationships and Phase Formation in the System BaF 2 -BaO-Y 2 O 3 -CuO x -H 2 O

January 1, 2002
Author(s)
Winnie K. Wong-Ng, Lawrence P. Cook, J Suh, Igor Levin, Mark D. Vaudin, Ron Feenstra, James P. Cline
The interplay of melting equilibria and reaction kinetics is important during formation of the Ba2YCu3O6+x (Y-213) phase from starting materials in the quaternary reciprocal system Ba,Y,Cu//O,F. For experimental investigation of the process we are using a

Research and Challenges in Applied Mechanics

January 1, 2002
Author(s)
K P. Chong, Martin Chiang
The United States Government pursues diligent funding of basic research because it confers a preferential economic advantage1. The National Science Foundation (NSF) and the National Institute of Standards and Technology (NIST) have supported basic research

The Fracture Toughness Round Robins in VAMAS: What We Have Learned

January 1, 2002
Author(s)
George D. Quinn
Over the last thirteen years the Versailles Advanced Materials and Standards (VAMAS) project has conducted five full fledged, international round robins on ceramic fracture toughness characterization. As many as forty laboratories have done thousands of

Thermal Shock Resistance of Silicon Nitrides Using an Indentation-Quench Test

January 1, 2002
Author(s)
S K. Lee, J D. Moretti, Brian R. Lawn
The thermal shock resistance of silicon nitrides is investigated using an indentation-quench procedure. Four grades of commercially available silicon nitrides with different microstructures are investigated. The extension of Vickers radial cracks is

Unexpected Ground State Structures in Relaxor Ferroelectrics

January 1, 2002
Author(s)
Benjamin P. Burton, Eric J. Cockayne
Cluster expansion Hamiltonians derived from pseudopotential total energies were used to predict ground-state (GS) cation configurations for some A(B^{3+}1⁄2B'^{5+}1⁄2)O3, A(B^{2+}{1/3}B'^{5+}{2/3})O3 , and [A^{1+}1⁄2A'^{3+}1⁄2]BO3 perovskites. Predicted GS

Variation of Electrical Properties With Exfoliation Condition in Nanocomposites

January 1, 2002
Author(s)
M M. McBrearty, Anthony J. Bur, S C. Roth
Dielectric measurements were made on clay filled nylon and polyethylene-ethyl vinyl acetate (PE-EVA) copolymer nanocomposites during processing by extrusion. Nylon without clay had a small dielectric dispersion while PE-EVA did not. The addition of natural
Displaying 1326 - 1350 of 1729
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