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Materials

Ceramics

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Displaying 426 - 450 of 1326

Crystal Structure, Stoichiometry, and Dielectric Relaxation in Bi 3.32 Nb 7.09 O 22.7 and Structurally Related Ternary Phases

April 17, 2008
Author(s)
I E. Grey, Terrell A. Vanderah, W G. Mumme, Robert S. Roth, Jorge T. Guzman, Juan C. Nino, Igor Levin
Ceramic materials which exhibit high relative dielectric permittivities and are processible at temperatures in the 1000 C to 1200 C range are of interest for embedded elements such as capacitor, resonators, and filters. Complex titanates, niobates, and

Physical Properties of LnAg y X 4-y (Ln =La, Ce; X = Al, Ga; y 0.72)

April 1, 2008
Author(s)
Jung Y. Cho, Monica Moldovan, David P. Young, Nathan Lowhorn, Julia Y. Chan
Single crystals of LnAg(y)X(4-y) (Ln = La, Ce; X = Al, Ga; y 0.72) were synthesized by aluminum or gallium flux and characterized by single crystal X-ray diffraction. LnAg(y)X(4-y) (Ln = La, Ce; X = Al, Ga; y 0.72) crystallize in the tetragonal space group

Veneer Versus Core Failure in Adhesively Bonded All-Ceramic Crown Layers

February 14, 2008
Author(s)
James J. Lee, Jae-Young Kwon, Sanjit Bhowmick, Isabel K. Lloyd
Joining a brittle veneer to a strong ceramic core with an adhesive offers benefits over current fabrication methods for all-ceramic crowns. However, such joining introduces the possibility of subsurface radial cracking in the veneer as well as in the core

Effects of Contact Geometry Upon Pull-Off Force Measurements With a Colloidal Probe

February 5, 2008
Author(s)
Seung Ho Yang, Huan Zhang, Michael Nosonovsky, Koo-Hyun Chung
This paper examines the effects of contact geometry on the pull-off (adhesion) force between a glass sphere (colloidal probe) and a silicon substrate in an environment with controlled relative humidity. An atomic force microscope (AFM) is used to measure

Determination of Work Functions in the Ta 1-x Al x N y /HfO 2 Advanced Gate Stack Using Combinatorial Methodology

January 24, 2008
Author(s)
Kao-Shuo Chang, Martin L. Green, Jason Hattrick-Simpers, John S. Suehle, Ichiro Takeuchi, Ozgur Celik, S De Gendt
Combinatorial methodology enables the generation of comprehensive and uniform samples, and therefore data sets, compared to the one-composition-at-a-time approach. We demonstrate the efficacy of combinatorial methodology applied to Ta1-xAlxNy alloys as

X-Ray Topography to Characterize Surface Damage on CdZnTe Crystals

January 7, 2008
Author(s)
David R. Black, Joseph C. Woicik, Martine Duff, Douglas Hunter, Arnold Burger, Michael Groza
Synthetic CdZnTe or CZT crystals can be used for room temperature detection of ?-radiation. Structural/morphological heterogeneities within CZT, such as twinning, secondary phases (often referred to as inclusions or precipitates), and polycrystallinity can

Do Plastic Zones Form at Crack Tips in Silicate Glasses?

December 13, 2007
Author(s)
Jose Lopez-Cepero, Sheldon M. Wiederhorn, Theo Fett, Jean-Pierre Guin
In a number of recent studies, the claim has been made that silicate glasses fracture by the formation, growth and coalescence of cavities, in the same way that metals do but at a much smaller scale. Evidence for cavity formation comes from the examination
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