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Displaying records 481 to 490 of 531 records.
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481. 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

482. 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

483. 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

484. 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

485. 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

486. Lattice Statice Green's Function Method for Multiscale Modeling of Point Defects and Extended Defects in Solids
Topic: Materials Science
Published: 7/1/2002
Author: Vinod K Tewary
Abstract: A method for multiscale modeling of point defects such as vacnacies and interstitials at the atomistic level and extended defects such as free surfaces and interfaces at the macroscopic continuum level in a solid is described. The method is based up ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851303

487. Reliability Improvements in Repair Welding of High Strength Steels
Topic: Materials Science
Published: 7/1/2002
Authors: Ivan Samardzic, Thomas Allen Siewert
Abstract: Engineers often have to deal with repair of weldments after they have been put into service. Here, the concern is that the service environment may have changed the structure, indepent of whether the problems originated during the initial constructio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851372

488. Formation of Solid Electrolyte Interface on Cycled Lithium-Ion Battery Cathodes: Soft X-ray Absorption Study
Topic: Materials Science
Published: 5/3/2002
Authors: Mahalingam Balasubramanian, James McBreen, Xiao-Qing Yang, H S Lee, A R Moodenbaugh, Daniel A Fischer, Ziwen Fu, D Abraham
Abstract: Lithium-ion batteries are promising candidates for hybrid electric vehicles (HEV). Batteries that exceed the requirements for HEV, as set by the Partnership for a New Generation of Vehicles (PNGV), have been designed and built. These batteries are ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850681

489. Multiscale Modeling of Point Defects and Free Surfaces in Semi-Infinite Solids
Topic: Materials Science
Published: 2/4/2002
Author: Vinod K Tewary
Abstract: A Green's function method is described for multiscale modeling of point defectssuch as vacancies and interstitials at the atomistic level and extended defects such as free surfaces and interfaces at the macroscopic continuum level in a solid. The po ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851258

490. Effective Hamiltonian Study of PZT 95/5
Topic: Materials Science
Published: 1/21/2002
Authors: K Leung, Eric J Cockayne, A F Wright
Abstract: An effective Hamiltonian is constructed for PbZr0.95Ti0.05O3. It is parameterized using ab initio results computed in the virtual crystal approximation. The phase diagram depends sensitively on the energetic competition between the stable orthorhomb ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850560



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