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Topic Area: Materials Science
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Displaying records 481 to 490 of 509 records.
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481. Bulk and Surface Evidence for the Long Range Spatial Modulation of X-Ray Absorption in the AlPdMn Quasicrystal at Bragg Incidence
Topic: Materials Science
Published: 1/1/2001
Authors: 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
Abstract: 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 dra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831152

482. Bulk-Moduli Systematics in Oxides, Including Superconductors
Topic: Materials Science
Published: 1/1/2001
Authors: H M Ledbetter, Sudook A Kim
Abstract: For oxides, including superconductors, we consider the systematics fo the bulk-modulus/atomic-volume (B/V^d{alpha}^) relationship. For nonsuperconducting oxides, the B-V^d{alpha} diagram shows that most oxides fall in three sets: (1) rocksalt crysta ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851365

483. Metal-Oxide Debye Temperature's and Elastic Constants: Estimation From Interionic Spacing
Topic: Materials Science
Published: 1/1/2001
Authors: H M Ledbetter, Sudook A Kim
Abstract: For cubic metal oxides, we show relationships between crystal-structure-volume properties and elastic-stiffness properties. The interionic distance (or the crystal structure plus volume) gives the bulk modulus B. The product of effective atomic mas ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851171

484. Quasicrystal Element Correlations From X-Ray Standing Waves
Topic: Materials Science
Published: 1/1/2001
Author: Terrence J Jach
Abstract: 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 refl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831144

485. 1,6-Hexanedithiol Monolayers on Au(111): A Multi-Technique Structural Study
Topic: Materials Science
Published: 12/29/2000
Authors: T Leung, M Gerstenberg, D J Lavrich, G Scoles, F Schreiber, G Poirier
Abstract: Monolayers of 1,6-hexanedithiol [HS(CH^d2^)^d6^SH] 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 resolu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830659

486. Phase Equilibria and Dielectric Behavior in the CaO:Al^d2^O^d3^:Nb^d2^O^d5^ System
Topic: Materials Science
Published: 11/1/2000
Authors: Terrell A Vanderah, W Febo, Julia Y. Chan, Robert S. Roth, J. M. Loezos, L D. Rotter, Richard G. Geyer, B A Reisner, Dennis Brooke Minor
Abstract: 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. Inde ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850430

487. Authentication and Dating of Biomass Components of Industrial Materials; Links to Sustainable Technology
Topic: Materials Science
Published: 10/1/2000
Authors: Lloyd A. Currie, D Klinedinst, R Burch, N Feltham, R Dorsch
Abstract: There are twin pressures mounting in U.S. industry for increased utilization of biomass feedstocks and biotechnology in production. The more demanding pressure relates to economic sustainability, that is, because of increased competition globally, b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831161

488. Structural Study of Ba^d11^Fe^d8^Ti^d9^O^d41^ by X-Ray Diffraction
Topic: Materials Science
Published: 9/1/2000
Authors: T Siegrist, C Svensson, Terrell A Vanderah, Robert S. Roth
Abstract: The crystal structure of Ba^d11^Fe^d8^Ti^d9^O^d41^ was determined using single-crystal and powder X-ray diffraction nethods. This new phase crystallizes in the hexagonal space group P6^d3^/mmc (No 194) (a=5.7506(3) , c=61.413(2) ; Z=2; Pcalc=5.75 g/ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850349

489. Phonons and Static Dielectric Constant in CaTiO^d3^ From First Principles
Topic: Materials Science
Published: 8/1/2000
Authors: Eric J Cockayne, Benjamin P Burton
Abstract: CaTiO^d3^ 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 densi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850401

490. X-Ray Topography Study of Surface Damage in Single-Crystal Sapphire
Topic: Materials Science
Published: 2/9/2000
Authors: David R Black, Robert S. Polvani, Kate Medicus, H E. Burdette
Abstract: X-ray diffraction topography was used to investigate the relationship between sub-surface damage, near-surface microstructure, and fracture strength in a series of sapphire modulus of rupture (MOR) bars which had been fabricated to proof test fabrica ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850319



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