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Displaying records 471 to 480 of 528 records.
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471. Elastic Stiffnesses, Debye Temperatures, and T^dc^ in Cuprates
Topic: Materials Science
Published: 9/1/2003
Authors: H M Ledbetter, K Sudook
Abstract: For cuprate superconductors and related oxides, we review some aspects of their elastic constants. We consider the systematics of the bulk-modulus/atomic-volume (B/V^da^) relationship. For nonsuperconducting oxides, the B-V^da^ diagram shows that m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851245

472. Elastic Constants of Natural Quartz
Topic: Materials Science
Published: 8/1/2003
Authors: Paul R Heyliger, H M Ledbetter, Sudook A Kim
Abstract: We measured the elastic constants of a natural-quartz sphere using resonance-ultrasound spectroscopy (RUS). Our measurements of the near-traction-free vibrational frequencies of the sphere are matched with the predicted frequencies from the dynamic ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851248

473. Formation of a Surface Quantum Dot Near Laterally and Vertically Neighboring Dots
Topic: Materials Science
Published: 7/1/2003
Authors: B Yang, Vinod K Tewary
Abstract: Elastic energy release rate (EERR) of a surface quantum dot (QD) near laterally and vertically neighboring seed QDs in a linear anisotropic elastic substrate iscalculated. An efficient boundary element method is used to solve the three-dimensional b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851315

474. Benzene Intermediates and Mechanisms during Catalytic Oxidation on the Pt (111) Surface Using Soft X-ray Fluorescence Methods
Topic: Materials Science
Published: 5/15/2003
Authors: A L Marsh, D J Burnett, Daniel A Fischer, J L Gland
Abstract: The catalytic oxidation of benzene on the Pt(111) surface has been characterized, in pressures of flowing oxygen up to 1.33 Pa, using temperature-programmed fluorescence yield near-edge spectroscopy (TP-FYNES). During temperature-programmed oxidatio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850735

475. Combining Magnets and Dielectrics: Crystal Chemistry in the BaO-Fe^d2^O^d3^-TiO^d2^ System
Topic: Materials Science
Published: 4/1/2003
Authors: T Siegrist, Terrell A Vanderah
Abstract: Phases observed in the Ba-Fe-Ti-O system are classified and described within the framework of close packed [O,Ba/O] layers, with the transition metals in either octahedral (titanium and iron) or tetrahedral (iron only) sites. The resulting crystal c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850669

476. Intermetallics Formation and Growth at the Interface of Tin-Based Solder Alloys and Copper Substrates
Topic: Materials Science
Published: 2/17/2003
Authors: Juan C Madeni, S X Liu, Thomas Allen Siewert
Abstract: Increasing concerns regarding environmental contamination is driving the soldering research community to develop lead-free solder alloys. Previous studies have shown that Sn-based alloys such as Sn-3.5Ag, Sn-0.7Cu, Sn-9Zn, and Sn-3.2Ag-O. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851327

477. Subsolidus Phase Equilibria and Crystal Chemistry in the System BaO-TiO^d2^-Ta^d2^O^d5^
Topic: Materials Science
Published: 1/1/2003
Authors: Terrell A Vanderah, Robert S. Roth, T Siegrist, W Febo, J. M. Loezos, Winnie K Wong-Ng
Abstract: Subsolidus phase relations have been determined for the BaO: TiO^d2^Ta^d2^O^d5^ system. Approximately 100 specimens were prepared in air at temperatures near but below the solidus (1275 C to 1500 C). For the binary BaO: Ta^d2^O^d5^ subsystem, the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850602

478. Phase Equilibria and Crystal Chemistry in the BaO-Al^d2^O^d3^-Nb^d2^O^d5^ and BaO-Nb^d2^O^d5^ Systems
Topic: Materials Science
Published: 11/1/2002
Authors: Terrell A Vanderah, B C Collins, Winnie K Wong-Ng, Robert S. Roth, L Farber
Abstract: Subsolidus phase equilibria in the BaO:Al^d2^O^d3^:Nb^d2^O^d5^ system at ~1250 C in air have been determined. Ternary compound formation in this system is limited to one new phase, Ba^d5.75^Al^d0.75^Nb^d9.25^O^d30^ (Ba^d6-x^Al^d1-x^Nb9+xO30, x=0.25; ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850531

479. Talking Ceramics
Topic: Materials Science
Published: 11/1/2002
Author: Terrell A Vanderah
Abstract: This is an invited Perspective article describing the technical needs and state-of-the-art research activities in the materials science of microwave ceramics, especially dielectric materials which serve as critical elements in resonators and filters ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850668

480. Application of an On-Line Weld Monitoring System
Topic: Materials Science
Published: 9/12/2002
Authors: Thomas Allen Siewert, Ivan Samardzic, Stefanija Klaric
Abstract: quisition analysis and real-time manipulation of the welding parameters offer added controls over the weld quality. Thanks to the continual development of information technology and electronics, it is possible to improve the systems for monitoring ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851294



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