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Topic Area: Materials Science

Displaying records 391 to 400 of 427 records.
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391. Blackman Diagrams and Elastic-Constant Systematics
Topic: Materials Science
Published: 1/5/2001
Author: H M Ledbetter
Abstract: We consider Blackman diagrams for various cubic materials. These diagrams, plots of reduced elastic-stiffness coefficients C^d12^/C^d11^ versus C^d44^/C^d11^, show that materials with similar chemical bonding tend to fall in the same region of the d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851169

392. Bulk-Moduli Systematics in Oxides Including Superconductors
Topic: Materials Science
Published: 1/5/2001
Authors: H M Ledbetter, Sudook A Kim
Abstract: For oxides, including superconductors, we consider the systematics of the bulk-modulus/atomic-volume (B/V^da^) relationship. For nonsuperconducting oxides, the B-V^da^ diagram shows that most oxides fall in three sets: (1) rocksalt crystal structure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851170

393. Elastic Gr neisen Parameters of Cubic Elements and Compounds
Topic: Materials Science
Published: 1/5/2001
Authors: H M Ledbetter, Sudook A Kim
Abstract: From a material's second-order elastic-stiffness coefficients C^dijkl^ and its third-order elastic-stiffness coefficients C^dijklmn^, we calculated the scalar dimensionless Gr neisen parameter {gamma}, the single most important property of an anharmo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851175

394. Metal-Oxide Debye Temperatures and Elastic Constants Estimation From Interionic Spacing
Topic: Materials Science
Published: 1/5/2001
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 {Beta}. The product of effective atom ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851173

395. 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

396. 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

397. 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

398. 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

399. 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

400. 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