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Materials

Ceramics

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Displaying 1126 - 1150 of 1323

Standards for Reliability Testing of Heavy Vehicle Propulsion Materials

January 1, 2001
Author(s)
S Jahanmir, James F. Kelly, William E. Luecke
The objective of this project is to develop international standard test methods for assessing the reliability of ceramic components used in diesel engines and other heavy vehicle propulsion systems. Advanced ceramics such as silicon nitride offer a unique

Tensile Creep in the Next Generation Silicon Nitride

January 1, 2001
Author(s)
F Lofaj, Sheldon M. Wiederhorn, Gabrielle G. Long, P R. Jemian
The tensile creep behavior of a Lu-containing silicon nitride (SN 281) was characterized in the temperature range of 1350oC to 1550oC for test periods up to 10000h. For the same test conditions, the minimum strain rates were several orders of magnitude

The Boundary Lubrication Properties of Model Esters

January 1, 2001
Author(s)
P M. McGuiggan
The friction of three chemically distinct esters was measured in order to determine how molecular architecture influences friction. The friction coefficients of mica surfaces separated by a thin film (

Crystal Structure of the Monoclinic Perovskite Sr 3.94Ca d1.31^Bi 2.70 O 12

December 1, 2000
Author(s)
Winnie K. Wong-Ng, James A. Kaduk, Qingzhen Huang, Robert S. Roth
The crystal structure of the low temperature oxidized form of Sr 3.94Ca 1.31Bi 2.70O 12 has been determined using a combined Rietveld refinement technique with neutron, synchrotron, and powder x-ray diffraction data. The structure is pseudo-orthorhombic

Editor's Preface

December 1, 2000
Author(s)
Kalman D. Migler, S G. Hatzikiriakos
The work of J.R. Rice has been central to developments in solid mechanics over the last thirty years. This volume collects 21 articles on deformation and fracture in honor of J.R. Rice on the occasion of his 60th birthday. Contributors include students (P

NIST Centennial Celebration - Crystallographic Highlights

December 1, 2000
Author(s)
Winnie K. Wong-Ng, Alan D. Mighell, Gabrielle G. Long, Leonid A. Bendersky, Vicky L. Karen, J D. Barnes, G L. Gilliland, T Gallagher, Terrell A. Vanderah, R G. Munro, Paul E. Stutzman, H F. McMurdie, S Block, Gasper J. Piermarini, Robert S. Roth, Antonio Santoro, Curt W. Reimann, C R. Hubbard, John W. Cahn, E Prince, D R. Lide, H Ondik, Lawrence P. Cook, T Siegrist, G DeTitta, L Finger, H Evans, E Gabe, G Enright, J T. Armstrong, M Levenson, Laurence C. Chow, Shozo Takagi, M Mathew, Jeffrey W. Lynn, H S. Peiser
NIST has a long history of crystallographic research, and has made significant contributions to the advancement of the fields of crystallography, biology, and materials science. The articles are contributed by scientists from various divisions at NIST, and

NIST Centennial Celebration Symposium Highlight

November 15, 2000
Author(s)
Alan D. Mighell, Winnie K. Wong-Ng
The Centennial Celebration of the National Institute of Standards and Technology (NIST), formerly known as the Bureau of Standards (NBS), takes place in the year 2001. NIST has a long history (>50 years) of crystallographic research, and has made

X-Ray Anomalous Scattering Study of a Charge-Ordered State in NaV 2 O 3

November 13, 2000
Author(s)
Shin-ichi Nakao, K Ohwada, N Takesue, Y Fujiii, M Isobe, Y Ueda, M V. Zimmermann, J P. Hill, D Gibbs, Joseph Woicik, L Koyama, Y Murakami
Charge ordering of V 4+ and V 5+ in NaV 2O 5 has been studied by an X-ray diffraction technique using anomalous scattering near a vanadium K-aborption edge to critically enhance a contrast between the two ions. A dramatic energy dependence of the

Combined 63,65 Cu NQR and NMR Study of Y 1-x Ca x Ba 2 Cu 3 O y

November 1, 2000
Author(s)
D M. Potrepka, J. I. Budnick, A R. Moodenbaugh, Daniel A. Fischer, W A. Hines
Zero-field 63,65Cu nuclear quadrupole resonance (NQR) and nuclear magnetic resonance (NMR) spectra were obtained at 1.3 K for powdered samples of Y 1-xCa xBa 2Cu 3O y with 0 less than or equal to} x less than or equal to} 0.20. The results for the

Damage-Resistant Brittle Coatings

November 1, 2000
Author(s)
Brian R. Lawn, K S. Lee, Herzl Chai, Antonia Pajares, D K. Kim, S Wuttiphan, I M. Peterson, X Z. Hu
A conceptually new approach to the design of brittle coating structures on soft substrates, based on prevention of crack initiation rather than on customary crack containment, is outlined. Concentrated loads produce two competing coating fracture modes

MatML: XML for Materials Property Data

November 1, 2000
Author(s)
E F. Begley, C P. Sturrock
This paper will provide a high level overview of MatML, an extensible markup language (XML) for materials property data. MatML is being developed in order to address the problems of interpretation and interoperability that arise when these data are

Phase Equilibria and Dielectric Behavior in the CaO:Al 2 O 3 :Nb 2 O 5 System

November 1, 2000
Author(s)
Terrell A. Vanderah, W Febo, Julia Y. Chan, Robert S. Roth, J. M. Loezos, L D. Rotter, Richard G. Geyer, B A. Reisner, Dennis B. Minor
Subsolidus phase equilibria in the CaO:Al2O3:Nb2O5 system at 1325 C in air have been determined. One ternary phase forms, Ca2AlNbO6, which exhibits a perovskite-related structure with 1:1 or NaCl-type ordering of Al3+ and Nb5+ on the B-sites. Indexed X-ray

TWA 27 - Characterisation Methods for Ceramic Powders and Green Bodies

November 1, 2000
Author(s)
R Wasche, M Naito, S Jahanmir
A new Technical Working Area (TWA) has been established with the broad aim of developing and standardising methods for the characterisation of ceramic powders and green bodies because they are important for ceramic manufacturing processes. In this regard

Material Properties of Titanium Diboride

October 1, 2000
Author(s)
R G. Munro
The physical, mechanical, and thermal properties of polycrystalline TiB 2 are reviewed with an emphasis on the significant dependence of the properties on the density and grain size of the material specimens. By examining the density and grain size

The Effect of Changing Molecular End Groups on Surface Properties: Synthesis and Characterization of Poly (Styrene-b-Semifluorinated Isoprene) Block Copolymers With -CF 2 H End Groups

October 1, 2000
Author(s)
T Hayakawa, J G. Wang, M Xiang, X Li, M Ueda, Christopher K. Ober, Jan Genzer, E Sivaniah, E J. Kramer, Daniel A. Fischer
Poly(styrene-b-semifluorinated isoprene) block copolymers with -CF 2H terminated side groups were synthesized by the esterification reaction of a poly(styrene-b-hydroxylated 1,2-/3,4-isoprene) block copolymer with semifluorinated acid chlorides. Two

The Ultra-Small-Angle X-Ray Scattering Instrument on UNICAT at the APS

October 1, 2000
Author(s)
Gabrielle G. Long, Andrew J. Allen, J Ilavsky, P R. Jemian, P Zchack
A new ultra-small-angle X-ray scattering (USAXS) instrument has been commissioned as part of the UNICAT facility on the 33-ID line at the Advanced Photon Source. The instrument offers continuously-tunable optics for anomalous USAXS, 1000 times the
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