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Displaying 2326 - 2350 of 2380

Broadband Dielectric Relaxation of Polymer Composite Films

January 1, 2001
Author(s)
C. K. Chiang, R Popielarz, R Nozaki, Jan Obrzut
The broadband dielectric relaxation of a BaTiO3-polymer composite film was studied. The complex dielectric constant data from 10 -4 Hz to 10 10 Hz reveals the existence of a relaxation process at a frequency of 10 MHz in the polymer composite. On the basis

Bulk and Surface Evidence for the Long Range Spatial Modulation of X-Ray Absorption in the AlPdMn Quasicrystal at Bragg Incidence

January 1, 2001
Author(s)
G Cappello, A Dechelette, F Schmithusen, S Decossas, J Chevrier, F Comin, V Formoso, M. De Boissieu, Terrence J. Jach, R. Colella, T Lograsso, C Jenks, D W. Delaney
An X-ray standing waves experiment was performed at the ID32 beam line of the ESRF on an Al-PD-Mn quasicrystal with the X-ray beam at normal incidence. The X-ray photoemission core levels for each element were recorded to probe the surface. The drain

Bulk-Moduli Systematics in Oxides, Including Superconductors

January 1, 2001
Author(s)
H M. Ledbetter, Sudook A. Kim
For oxides, including superconductors, we consider the systematics fo the bulk-modulus/atomic-volume (B/V α) relationship. For nonsuperconducting oxides, the B-V α diagram shows that most oxides fall in three sets: (1) rocksalt crystal structure, AO; (2)

Embracing Uncertainty: Modeling Uncertainty in EPMA - Part II

January 1, 2001
Author(s)
Nicholas Ritchie
This, the second in a series of articles present a new framework for considering the computation of uncertainty in electron excited X-ray microanalysis measurements, will discuss matrix correction. The framework presented in the first article will be

Preparation and Characterization of Photopatternable BaTiO 3 / Polymer Composites

January 1, 2001
Author(s)
R Popielarz, C. K. Chiang, R Nozaki, Jan Obrzut
The dielectric properties of acrylic resin composites filled with BaTiO 3 have been evaluated in the broad frequency range. These materials were used as models to study the dielectric response in polymer composite films for de-coupling capacitance

Quasicrystal Element Correlations From X-Ray Standing Waves

January 1, 2001
Author(s)
Terrence J. Jach
X-ray standing waves associated with dynamical diffraction in perfect crystals are also present during diffraction in high-quality quasicrystals. The fluorescence observed from quasicrystals while scanning the rocking curve of a particular Bragg reflection

Textile Composites: Modelling Strategies

January 1, 2001
Author(s)
S V. Lomov, G Huysmans, Y Luo, Richard~undefined~undefined~undefined~undefined~undefined Parnas, A Prodromou, I Verpoest, Frederick R. Phelan Jr.

The Application of Optical Coherence Tomography to Problems in Polymer Matrix Composites

January 1, 2001
Author(s)
Joy Dunkers, Frederick R. Phelan Jr., D P. Sanders, M J. Everett, William H. Green, Donald L. Hunston, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The Composites Group at the National Institute of Standards and Technology has found optical coherence tomography (OCT) to be a powerful tool for non-destructive characterization of polymer matrix composites. Composites often exhibit superior properties to

Using Self-Assembled Monolayer Technology to Probe the Fiber-Matrix Interface

January 1, 2001
Author(s)
Gale A. Holmes, E Feresenbet, D T. Raghavan
hesion at the fiber matrix interface of composite specimens is often ascribed to the following factors (Sharpe and Drzal): (1) mechanical interlocking, (2) physicochemical interactions, (3) chemical bonding, and (4) mechanical deformation of the fiber

1,6-Hexanedithiol Monolayers on Au(111): A Multi-Technique Structural Study

December 29, 2000
Author(s)
T Leung, M Gerstenberg, D J. Lavrich, G Scoles, F Schreiber, G Poirier
Monolayers of 1,6-hexanedithiol [HS(CH 2) 6SH] deposited on Au(111) from the gas phase were characterized by scanning tunneling microscopy (STM), grazing incidence X-ray diffraction (GIXD), and low energy atom diffraction (LEAD). Molecular resolution STM

Phase Equilibria and Dielectric Behavior in the CaO:Al 2 O 3 :Nb 2 O 5 System

November 1, 2000
Author(s)
Terrell A. Vanderah, W Febo, Julia Y. Chan, Robert S. Roth, J. M. Loezos, L D. Rotter, Richard G. Geyer, B A. Reisner, Dennis B. Minor
Subsolidus phase equilibria in the CaO:Al2O3:Nb2O5 system at 1325 C in air have been determined. One ternary phase forms, Ca2AlNbO6, which exhibits a perovskite-related structure with 1:1 or NaCl-type ordering of Al3+ and Nb5+ on the B-sites. Indexed X-ray

Structural Study of Ba 11 Fe 8 Ti 9 O 41 by X-Ray Diffraction

September 1, 2000
Author(s)
T Siegrist, C Svensson, Terrell A. Vanderah, Robert S. Roth
The crystal structure of Ba 11Fe 8Ti 9O 41 was determined using single-crystal and powder X-ray diffraction nethods. This new phase crystallizes in the hexagonal space group P6 3/mmc (No 194) (a=5.7506(3) , c=61.413(2) ; Z=2; Pcalc=5.75 g/cm 3) and

Phonons and Static Dielectric Constant in CaTiO 3 From First Principles

August 1, 2000
Author(s)
Eric J. Cockayne, Benjamin P. Burton
CaTiO 3 has a static dielectric constant that extrapolates to a value greater than 300 at zero temperature. We investigate the origin of this large dielectric response on a microscopic level, using first-principles plane-wave pseudopotential density

A Test Method for Assessing Interfacial Shear Strength in Composites

May 1, 2000
Author(s)
Gale A. Holmes, Donald L. Hunston, Walter G. McDonough, R C. Peterson
Two of the critical factors controlling the long-term performance and durability of composites in structural applications is the fiber-matrix interfacial shear strength (IFSS) and the durability of the fiber-matrix interface. The single fiber fragmentation

Imaging of Composite Defects and Damage Using Optical Coherence Tomography

May 1, 2000
Author(s)
Joy Dunkers, M J. Everett, D P. Sanders, Donald L. Hunston
The Composites Group at the National Institute of Standards and Technology has found optical coherence tomography (OCT) to be a powerful tool for non-destructive characterization of polymer matrix composites. Composites can be made more cost competitive by
Displaying 2326 - 2350 of 2380
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