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Topic Area: Materials Science

Displaying records 471 to 480 of 526 records.
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471. 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

472. 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

473. 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

474. 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

475. 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

476. 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

477. 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

478. 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

479. Acoustic Spectroscopy of Lithium Niobate: Elastic and Piezoelectric Coefficient
Topic: Materials Science
Published: 9/1/2002
Authors: H Ogi, Y Kawashima, M Hirao, H M Ledbetter
Abstract: We report the first Simultaneous measurement of a crystal's complete elastic and piezoelectric coefficients: C^dif^, e^dijk^. The studied crystal was lithium niobate (LiNbO^d3^) with trigonal crystal symmetry (3 m point group), thus six independent ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851242

480. Crystal Structure of Ba^d27^Fe^d16^Ti^d33^O^d117^
Topic: Materials Science
Published: 7/1/2002
Authors: T Siegrist, Terrell A Vanderah, C Svensson, Robert S. Roth
Abstract: Single-crystal X-ray diffraction studies indicate that the compound Ba^d27^Fe^d16^Ti^d33^O^d117^- crystallizes in the rhombohedral space group R-3m, with a hexagonal unit cell a=5.7400(8) , c=127.11(3) ; Z=1.5. The arrangement may be described as ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850585



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