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Displaying 251 - 275 of 1326

Phase Equilibria of the High Tc Superconductors in the (Bi, Pb) -SR-Ca-Cu-O System

February 19, 2017
Author(s)
Winnie Wong-Ng, Lawrence P. Cook, W Greenwood, Anthony J. Kearsley
Applications of (Bi,Pb)-Sr-Ca-Cu-O phase equilibria include material synthesis, melt processing and single crystal growth. Both liquidus and subsolidus data are of central importance. For the determination of liquidus data, we have used a wicking technique

Phase Relations in Ba-(Nd,Eu,Gd)-Cu-O Coated Conductor Films

February 19, 2017
Author(s)
Winnie Wong-Ng, Igor Levin, Joseph J. Ritter, Lawrence P. Cook, Guangyao Liu, Makoto Otani, Christopher E. Lucas, Shailee P. Diwanji, Ron Feenstra, P Goyal, Mark D. Vaudin
Knowledge of phase relations in thin films of Ba2RCu3O6+x (where R=lanthanides or mixed lanthanides) is needed to guide the processing of coated conductors. High-temperature X-ray diffraction studies of Ba2RCu3O6+x films deposited using the

Phase-Correct Bond Lengths in Crystalline-Ge x Si l-x Alloys

February 19, 2017
Author(s)
Joseph Woicik, K E. Miyano, C A. King, R W. Johnson, J G. Pellegrino, T L. Lee, Z H. Lu
Extended x-ray absorption fine structure performed at the Ge-K edge has determined the Ge-Ge and Ge-Si bond lengths in a series of crystalline-Ge l-x alloys (x [greater than/less than] 0.5) to be compositional dependent. This high-precision measurement was

Polarization Dependence of Raman Peak Heights in the Absence of an Analyzer

February 19, 2017
Author(s)
Grady S. White, L M. Braun, M I. Bell
The general expression relating Raman scattering intensity to incident and scattered polarization directions is modified to account for an experimental configuration without an analyzer. This expression, combined with the known polarizability tensors for

Practical Intrinsic-Error Bounds for X-Ray Computed Tomography

February 19, 2017
Author(s)
R D. Spal
Images produced by x-ray computed tomography contain intrinsic error due to the limited spatial resolution of the technique. Two bounds on the mean intrinsic error over a specified region are determined, given only minimal information about the object

Predicting Fracture Resistance of Brittle Crystals

February 19, 2017
Author(s)
Grady S. White, Stephen W. Freiman, Lin-Sien H. Lum
A simple expression is derived relating fracture surface energy to easily measured material properties, i.e., the elastic Young's modulus and the equilibrium atomic plane spacing via a proportionality constant, k. This expression appears to be independent

Predictive chemical kinetic model for lubricant performance: bench testings

February 19, 2017
Author(s)
Stephen M. Hsu, C I. Chen
Bench tests have been used to screen lubricants and additives for industrial fluids in machinery applications for a very long time. As technology becomes more sophisticated in terms of materials, controls, and design, the need for simple, quick, and cheap

Raman Stress Evaluation: Hydrostatic vs. Biaxial Calibration

February 19, 2017
Author(s)
L M. Braun, Grady S. White
Comparisons of two technical approaches for stress measurement based on the peak shifts associated with micro-Raman spectra are described. Stress values were obtained from evaluation of the relationship between peak shift and stress determined by both a

Rapid Detection of Thin-Film Interfacial Reactions by MEMS-DSC

February 19, 2017
Author(s)
Lawrence P. Cook, Richard E. Cavicchi, Yanbao Zhang, Mark D. Vaudin, Christopher B. Montgomery, William F. Egelhoff Jr., Martin L. Green, Leslie Allen
A MEMS-based differential scanning calorimeter (DSC) has been used to characterize the Ni/Si interfacial reaction in thin films at ramp rates of 940 C/s and 3760 C/s. The DSC devices were fabricated using CMOS semiconductor processing technology, and were

Relationship Between Microstructure and Wear of Dental Ceramics and Composite Resins

February 19, 2017
Author(s)
V S. Nagarajan, S Jahanmir, B Hockey, Victoria Thompson
The effect of microstructure on the wear mechanisms of glass-ceramics and resin composites was studied. Wear tests on both types of materials were conducted using a pin-on-disk apparatus. Wear of glass-ceramics increased with increasing mica platelet

Simulations of Microstructural Evolution: Anisotropic Growth and Coarsening

February 19, 2017
Author(s)
A R. Roosen, W Carter
Two-dimensional calculations of anisotropic growth and coarsening are illustrated. This model is intended to simulate the development of microstructure in materials like Silicon Nitride. The model is comprised of an ensemble of polygonal particles with

Spontaneous Ejecta From [Beta]-Eucryptite Composites

February 19, 2017
Author(s)
Ivar E. Reimanis, C Seick, K Fitzpatrick, Lin-Sien H. Lum, S Landin
Polycrystalline ceramic composites, comprised of primarily b-eucryptite (LiAlSiO4) and lithium aluminate (LiAl5O8) crystals, with a near-zero coefficient of thermal expansion were examined with indentation experiments. A unique behavior is reported

Standards for Biomaterials

February 19, 2017
Author(s)
Stephen W. Freiman, John A. Tesk
This paper is a summary of a workshop session during the Workshop on Biomedical Materials and Devices, held June 13-14, 2001. The workshop is part of a series of workshops and topical meetings organized by NIST in the area of biomedical technology. The
Displaying 251 - 275 of 1326