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Displaying 1151 - 1175 of 1321

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

Assessment of Moisture Measurement Techniques for Ceramic Processing

August 1, 2000
Author(s)
P S. Wang
This report presents an assessment of moisture measurement tests by techniques currently available for ceramic processing applications. The techniques tested include near infrared, microwave, proton nuclear magnetic resonance, magnetic resonance imaging

Comparative of Texture Analysis Techniques for Highly Oriented a-Al 2 O 3

August 1, 2000
Author(s)
M M. Seabugh, Mark D. Vaudin, James Cline, G L. Messing
Texture measurements were performed on liquid phase sintered alumina textured by a templated grain growth process. Texture distributions were measured using four techniques (x-ray pole figure, rocking curve, and Rietveld refinement and stereological

Cracking of Brittle Coatings Adhesively Bonded to Substrates of Unlike Modulus

August 1, 2000
Author(s)
K -. Lee, Y W. Rhee, Douglas H. Blackburn, Brian R. Lawn, H Chai
The role of elastic mismatch in determining critical conditions for indentation fracture in brittle coatings on substrates of unlike modulus is investigated. A model transparent trilayer system, consisting of a glass coating layer bonded to a thick

Molecular Orientation of Single and Two-Armed Monodendron Semifluorinated Chains on Soft and Hard Surfaces Studied Using NEXAFS

August 1, 2000
Author(s)
Jan Genzer, E Sivaniah, E K. Kramer, J G. Wang, M Xiang, K Char, Christopher K. Ober, Robert A. Bubeck, Daniel A. Fischer, M Graupe, R Colorado, O E. Shmakova, T R. Lee
Near-edge absorption fine structure (NEXAFS) measurements are used to probe the molecular orientation of semifluorinated (SF) mesogens, -(CH 2)x(CF 2)yF, which are attached to I) the isoprene backbone of polyisoprene or a styrene-isoprene diblock copolymer

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

Vortex Pinning in Microindented Yba 2 Cu 3 O 7-x Single Crystals

August 1, 2000
Author(s)
Marina Turchinskaya, Douglas T. Smith, Alexander L. Roytburd, Debra L. Kaiser
A high resolution magneto-optical technique with a magnetic indicator film was used to study the effect of a regular array of micrometer-sized mechanical indentations on magnetization dynamics at the surface of a twinned single crystal of Yba 2Cu 3O 7-δ as

A Nanocomposite Poly(Methyl-Methacrylate) Bone Cement

July 1, 2000
Author(s)
A H. Gomoll, A Bellare, W Fitz, T S. Thornhill, R D. Scott, P R. Jemian, Gabrielle G. Long
Poly(methyl methacrylate) (PMMA) based orthopaedic bone cements contain 1-3 micro υ size radiopacifier particles. Incomplete dispersion of these particles leads to the presence of 50-200 micro υ size agglomerates. These large defects are sites of high

Abrasive Machining of Glass-Ceramics With a Dental Handpiece

July 1, 2000
Author(s)
X Dong, L Yin, S Jahanmir, L K. Ives, E D. Rekow
Machinable glass ceramics are used to prepare dental restorations with modern dental CAD/CAM systems. Unfortunately, little is understood about the influence of mahining parameters on material removal rates and any damage which could be introduced into the

Effect of Interfacial Layers on Wear Behavior of a Dental Glass-Ceramic

July 1, 2000
Author(s)
A Ravikiran, S Jahanmir
Wear studies on a glass-ceramic dental restorative material were performed under two types of lubrication conditions with distilled water. In one set of experiments, the contact interface was continuously flushed with fresh water to remove the wear debris

Fracture and the Structure of Silica

July 1, 2000
Author(s)
Stephen W. Freiman
Not only because of its historic and widespread use in applications where its strength and brittle nature are significant factors, but also because it is homogeneous in composition and structure, and isotropic in its properties, glass is an ideal medium in

Flux Pinning of Bi 2 Sr 2 CaCu 2 O 8+g /Ag Superconductors Utilizing (Sr,Ca) 14 Cu 24 O 41 Defects and Nanophase Al 2 O 3 and Au Particles

June 1, 2000
Author(s)
T J. Haugan, Winnie K. Wong-Ng, Lawrence P. Cook, H J. Brown, L Swartzendruber, D T. Shaw
Investigations into flux pinning of Bi 2Sr 2 CaCu 2O 8+γ /Ag (Bi-2212/Ag) thick film conductors utilizing micron-sized (Sr,Ca) 14Cu 24O 41 and nanophase Al 2O 3 and Au particles are described. Addition of defect particles delayed and reduced formation of

In-Situ Observation of Small-Angle X-Ray Scattering by Dislocations

June 1, 2000
Author(s)
Lyle E. Levine, Gabrielle G. Long, R Thomson
Ultra-small-angle X-ray scattering by dislocations in single-crystal aluminum has been observed in situ as a function of plastic deformation. The scattering is observed to be strongly dependent upon sample orientation, with single dislocations, dislocation
Displaying 1151 - 1175 of 1321
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