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Topic Area: Materials Science

Displaying records 411 to 420 of 512 records.
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411. Phase Formation and Properties in the System Bi2O 3:2CoO 1+x:Nb2O5
Topic: Materials Science
Published: 9/13/2006
Authors: Terrell A Vanderah, T Siegrist, M W Lufaso, C Yeager, Juan C Nino, S Yates, Robert S. Roth
Abstract: Subsolidus phase relations have been determined for the Bi-Co-Nb-O system in air (750 C to 925 C). Ternary compound formation was limited to pyrochlore (A2B 2O 6O ), which formed a substantial solid solution region at Bi-deficient stoichiometries ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850959

412. Crack Tip Opening Angle: Measurement and Modeling of Fracture Resistance in Low and High Strength Pipeline Steels
Topic: Materials Science
Published: 9/1/2006
Authors: Philippe P. Darcis, Joseph David McColskey, Christopher N McCowan, Thomas Allen Siewert, Gabriel Kohn, Arry Bussiba, Richard Joel Fields
Abstract: Crack tip opening angle (CTOA) is becoming one of the more widely accepted properties for characterizing fully plastic fracture. In fact, it has been recognized as a measure of the resistance of a material to fracture, in cases where there is a large ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50312

413. Fatigue Crack Growth Rates in Five Pipeline Steels
Topic: Materials Science
Published: 9/1/2006
Authors: Arry Bussiba, Philippe P. Darcis, J D McCloskey, Christopher N McCowan, Thomas Allen Siewert, Gabriel Kohn, R P Smith, J. Merritt
Abstract: This study presents fatigue data for six different pipeline steels, with strengths ranging from Grade B to X100. A fatigue crack growth test for full-thickness pipeline samples was developed using a Middle Tension (MT) type specimen. The six steels s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50360

414. Broadband coherent anti-strokes Raman spectroscopy characterization of polymer thin films
Topic: Materials Science
Published: 8/2/2006
Authors: Lee J Richter, M C. Gurau, Zachary Schultz
Abstract: Broadband coherent anti-Stokes Raman spectroscopy (CARS) is demonstrated as an effective probe of the polymer thin film materials. A simple modification to a commercially available 1 kHz SFG spectrometer permits acquisition of CARS spectra for polym ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902172

415. Second Symposium on Pendulum Impact Machines: Procedures and Specimens
Topic: Materials Science
Published: 8/1/2006
Authors: Thomas Allen Siewert, Christopher N McCowan, M. P. Manahan
Abstract: This publication consists primarily of the papers presented at the Second Symposium on Pendulum Impact Machines: Procedures and Specimens, sponsored by ASTM Committee E28 on Mechanical Testing and its Subcommittee E28.07 on Impact Testing. The Sympos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50248

416. Phase Formation, Crystal Chemistry, and Properties in the Magnetic Dielectric System Bi^d2^O^d3-^Fe^d2^O^d3-^Nb^d2^O^d5^
Topic: Materials Science
Published: 6/22/2006
Authors: M W Lufaso, Terrell A Vanderah, I M Pazos, Igor Levin, Juan C Nino, Virgil Provenzano, Peter K. Schenck, Robert S. Roth
Abstract: Subsolidus phase relations have been determined for the Bi2O3-Fe2O3-Nb2O5 system in air (900-1075 C). Three new ternary phases were observed Bi3Fe0.5Nb1.5O9 with an Aurivillius-type structure, and two phases with approximate stoichiometries Bi17Fe2 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850944

417. An Octagonal Architecture for High Strength PIT Nb^d3^Sn Conductors
Topic: Materials Science
Published: 6/6/2006
Authors: L. R. Motowidlo, E Barzi, D. Turrioni, Najib Cheggour, Loren Frederick Goodrich
Abstract: Powder-in-Tube (PIT) Nb^d3^Sn conductors have been fabricated utilizing a low-cost intermetallic Cu^d5^Sn^d4^ powder as the tin source. A novel octagonal PIT design that incorporates dispersion strengthened copper as well as a hexagonal PIT design w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900875

418. Kinetics Governing Phase Separation of Nanostructured Sn(x)Ge(1a 'x) Alloys.
Topic: Materials Science
Published: 6/5/2006
Authors: Regina Regan, Harry A Atwater, Jonathan E Guyer, Erik Meserole, Mark S Gorrsky
Abstract: We have studied the dynamic phenomenon of SnxGe1a 'x/Ge phase separation during deposition by molecular beam epitaxy on Ge(001) substrates.Phase-separation leads to the formation of direct bandgap semiconductor nanowire arrays embedded in Ge oriented ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853551

419. Effect of Self-Assembled Monolayer Film Order on Nanofriction
Topic: Materials Science
Published: 5/11/2006
Authors: S Sambasivan, S Hsieh, Daniel A Fischer, Stephen M. Hsu
Abstract: Self-assembled monolayers (SAMs) have increasingly being explored as potential protective films in devices friction and adhesion. However, accurate determination of the nanomechanical properties of monolayer films is difficult and fraught with uncert ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850918

420. Anisotropic elastic properties of nanocrystalline nickel thin films
Topic: Materials Science
Published: 5/1/2006
Authors: Donna C. Hurley, Roy Howard Geiss, N Jennett, Malgorzata Kopycinska-Mueller, A Maxwell, Jens Mueller, David Thomas Read, J Wright
Abstract: As length scales continue to shrink, new tools are needed to measure mechanical properties. We are developing two such tools using different nondestructive acoustical techniques. Surface acoustic wave spectroscopy (SAWS) uses laser-ultrasonic methods ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50050



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