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Materials

Ceramics

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Displaying 976 - 1000 of 1323

Crystal Structure of the Compound Bi 2 Zn 2/3 Nb 4/3 O 7

June 1, 2002
Author(s)
Igor Levin, T G. Amos, J Nino, Terrell A. Vanderah, I Reaney, C A. Randall, M T. Lanagan
The crystal structure of Bi2Zn2/3Nb4/3O7 was determined using a combination of electron, X-ray and neutron powder diffraction. The compound crystallizes with a monoclinic zirconolite-like structure (C2/c (No.15) space group, a=13.1037(9) , b=7.6735(3) , c

Effect of Loading Rate Upon Conventional Ceramic Microindentation Hardness

June 1, 2002
Author(s)
George D. Quinn, P J. Patel, Isabel K. Lloyd
Dynamic micro-indentation hardness was evaluated for a steel, sintered silicon carbide, and an aluminum oxynitride. There was negligible effect upon Vickers hardness when loading rate was varied by almost three orders of magnitude.

Elastic Moduli Data for Polycrystalline Oxide Ceramics

June 1, 2002
Author(s)
R G. Munro
A compilation of elastic moduli data, including Young's modulus, shear modulus, bulk modulus, and Poisson's ratio, is presented for polycrystalline oxide ceramics. The data have been collected from the technical literature, either as reported in textual or

Grain Growth and Twin Formation in 0.74 PMN-0.26 PT

June 1, 2002
Author(s)
Jay S. Wallace, J M. Huh, J Blendell, C A. Handwerker
The mechanisms controlling normal and exaggerated grain growth in lead magnesium niobate-lead titanate (PMN-PT) ceramics have been investigated by varying the PbO-based liquid phase volume fraction from 0.03 to 0.6 and sintering temperature form 900 C to

Structural Study of Li 1+x-y Nb 1-x-3y Ti x+4y O 3 Solid Solutions

June 1, 2002
Author(s)
L Farber, Igor Levin, A Borisevich, I E. Grey, Robert S. Roth, P K. Davies
The structures of Lil+x-yNbl-,-3yTix+4yO3 solid solutions within the so-called M-phase field in the Li2O-Nb2O5-TiO2system were investigated using HRTEM and single crystal X-ray diffraction. The results demonstrated the phasefield is comprised of a

Unraveling the Symmetry of the Hole States Near the Fermi Level in the MgB 2 Superconductor

June 1, 2002
Author(s)
Y Zhu, A R. Moodenbaugh, G Schneider, J W. Davenport, T Vogt, Q Li, G Gu, Daniel A. Fischer, J Tafto
We use x-ray absorption spectroscopy (XAS) and electron energy loss spectroscopy (EELS) to study the near edge fine structure at the K-edge of boron in the superconductor M gB 2. We observe in XAS a peak of width 0.6 eV at the threshold of this K-edge

Accuracy and Reproducibility of X-Ray Texture Measurements on Thin Films

May 1, 2002
Author(s)
Mark D. Vaudin, G R. Fox, G -. Kowach
Rocking curve texture measurements were made on thin films of zinc oxide (ZnO) and platinum (Pt) using a powder x-ray diffractometer, and also, in the case of ZnO, an area detector. The intensity corrections for defocussing and other geometric factors were

Cracking in Ceramic/Metal/Polymer Trilayer Systems

May 1, 2002
Author(s)
H Zhao, P Miranda, Brian R. Lawn, X Z. Hu
Fracture and deformation in model brittle-outerlayer/metal-core/polymer substrate trilayer systems in concentrated loading are studied. Model systems for experimental study are fabricated from glass microscope slides glued with epoxy adhesive onto steel

Effect of Counterface Roughness on Abrasive Wear of Hydroxyapatite

May 1, 2002
Author(s)
Sergei Kalinin, S Jahanmir, L K. Ives
The present study was undertaken to evaluate the effect of surface roughness of glass-infiltrated alumina on the abrasive wear of hydroxyapatite using a pin-on-disk tribometer. Hydroxyapatite was used as a model material to simulate tooth enamel. The wear

Friction Measurements of Ultra-Thin Carbon Overcoats in Air

April 1, 2002
Author(s)
P M. McGuiggan, C S. Bhatia, D Bogy, W Fong, Stephen M. Hsu
The friction force as a function of humidity was measured between 5 nm thick carbon films coated onto mica surfaces. The friction was found to be proportional to the area of contact. The shear stress at 0%, 33%, and 100% humidity was measured to be 25 +6

Quadrupole Effects in Core and Valance Photoelectron Emission From Crystalline Germanium Measured Via a Spatially Modulated X-Ray Interference Field

April 1, 2002
Author(s)
E J. Nelson, Joseph C. Woicik, P Pianetta, I A. Vartanyants, J W. Cooper
Near an x-ray Bragg reflection, two x-ray beams (incident and reflected) with opposite wavevectors exist within the crystal to create an x-ray standing wave (XSW) interference field. The part of the photoelectron yield depending on quadrupole (and higher

Creep of Lanthanum Gallate

March 1, 2002
Author(s)
William E. Luecke, T R. Armstrong
Strontium- and magnesium-doped lanthanum gallate (LSGM) was deliberately prepared to give A-site deficient non-stoichiometry with compositions (La 0.9Sr 0.1)z(Ga 0.8Mg 0.2)O 3-delta (z =1.0,0.98, and 0.95). Creep tests in four-point 950 C 75 Mpa in air

Parallel Calculation of Electron Multiple Scattering Using Lanczos Algorithms

March 1, 2002
Author(s)
Charles E. Bouldin, A L. Ankudinov, J J. Rehr, James S. Sims, Howard Hung
Real space multiple scattering calculations of the elctronic density of states and x-ray spectra in solids typically scale as the cube of the system and basis set size, and hence are highly demanding computationally. For example, calculations near the Si K
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