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Topic Area: Materials Science
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Displaying records 411 to 420 of 507 records.
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411. 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

412. 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

413. 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

414. 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

415. 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

416. NIST Recommended Practice Guide: DTA and Heat-Flux DSC Measurements of Alloy Melting and Freezing
Topic: Materials Science
Published: 4/30/2006
Authors: William J Boettinger, Ursula R Kattner, Kil Won Moon, John Perepezko
Abstract: This document is focused on differential thermal analysis (DTA) and heat-flux differential scanning calorimetry (HF-DSC) of metals and alloys. A thermal analysis guide focused only on metals and alloys is appropriate because they behave quite differ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901091

417. International Comparison of Impact Reference Materials (2004)
Topic: Materials Science
Published: 4/3/2006
Authors: Christopher N McCowan, G. Roebben, Y. Yamaguchi, S. Lefrancois, Jolene D Splett, S. Takagi, A. Lamberty
Abstract: A three-year horizontal comparison has been completed between national laboratories that certify specimens for the indirect verification of Charpy impact test machines. The participants in this study were the Institute for Reference Materials and Mea ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=30057

418. Transverse Fracture of Brittle Bilayers Relevance to Failure of All-Ceramic Dental Crowns
Topic: Materials Science
Published: 3/1/2006
Authors: Jeonghwan Kim, Sanjit Bhowmick, Ilja Hermann, Brian Ronald Lawn
Abstract: A study is made of the behavior of cracks approaching interfaces in all-ceramic crown-like bilayers. Flat specimens are fabricated by fusing porcelain veneers onto Y-TZP and alumina core ceramic plates, with veneer/core matching to minimize residual ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850132

419. Comparison of the Fouling Release Properties of Hydrophobic Fluorinated and Hydrophilic PEGylated Block Copolymer Surfaces
Topic: Materials Science
Published: 1/19/2006
Authors: S Krishman, N Wang, Christopher K. Ober, J Finlay, M E Callow, J A Callow, A Hexemer, K E Sohn, E J Kramer, Daniel A Fischer
Abstract: To understand the role of surface-wettability on adhesion of cells, the attachment of two different marine algae was studied on hydrophobic and hydrophilic polymer surfaces. Adhesion of cells of the diatom Navicula and sporelings (young plants) of th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850971

420. Effects of Noise on Lamb-Mode Acoustic-Emission Arrival Times Determined by Wavelet Transform
Topic: Materials Science
Published: 12/1/2005
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher
Abstract: Precise AE signal arrival times of the fundamental Lamb modes can be obtained from the arrival time of the peak wavelet transform (WT) magnitude at a particular frequency of interest. Since these arrival times are not determined from a fixed threshol ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50139



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