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Materials

Ceramics

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Displaying 1301 - 1323 of 1323

USAXS Studies of Silica Fume Additives in Cements and Concrete

April 1, 1998
Author(s)
Andrew J. Allen, Richard A. Livingston
Supplementary cementitious materials like silica fume, which are added to the cement mix and react with calcium ions in the pore solution, enhance the production of calcium-silicate-hydrate gel and modify the microstructure in other ways. By combining

Pb-Distribution in a Five-Phase (Bi, Pd)-Sr-Ca-Cu-O Assemblage

March 12, 1998
Author(s)
Lawrence P. Cook, Winnie K. Wong-Ng
The partitioning of lead between phases in the nominal five-phase assemblage: (Pb,Bi) 3Sr 2Ca 2CuO x + (Ca,Sr) 2PbO 4 + (Bi,Pb) 2Sr 2CaCu 2O x + (Ca,Sr)O + Liquid has been investigated in an atmosphere of 7.5% O 2925% Ar. Samples were studied using a

Dynamic and Static Grain Growth During the Superplastic Deformation of 3Y-TZP

March 1, 1998
Author(s)
J Seidensticker, M J. Mayo
While phenomenological theories of superplasticity have often suffered from the fact that a single phenomenological law is not universally applicable to all superplastic systems, it is shown that a universal dynamic grain growth law does apply. The law is

Small Angle Scattering by Dislocations

March 1, 1998
Author(s)
R Thomson, Lyle E. Levine, Gabrielle G. Long
It is shown that the small-angle scattering of x rays or neutrons by dislocations in a deformed metal, which are partially ordered into wall-like structures, is characterized by several structure factors. Principally there are associated with 1) a single

Crystal Structure and Properties of Ba 5 Fe 4 ^Ti 10 O 31

February 23, 1998
Author(s)
T Siegrist, Terrell A. Vanderah, A P. Ramirez, Richard G. Geyer, Robert S. Roth
Using single-crystal and powder X-ray diffraction methods, the crystal structure of the new compound Ba 5Fe 4Ti 10O 31 was determined and its magnetic and dielectric properties were measured. Ba 5Fe 4Ti 10O 31 crystallizes in space group P6 3/mcm (no. 193)

Structure Analysis of the 6H - Ba[Ti,Fe 3+ ,Fe 4+ ]O 3 -d^ Solid Solution

February 1, 1998
Author(s)
I E. Grey, C Li, L M. Cranswick, Robert S. Roth, Terrell A. Vanderah
The 6H form of BaTiO 3 forms an extensive solid solution with barium iron oxide, having the general formula BaTi 1-X-yFe 3+ xFe 4+ yO 3-δ, δ=x/2, where the Feu3+^/Fe 4+ ratio depends on reaction temperature and gas atmosphere. Solid solution members having

1997 NIST Ceramics Division Technical Activities

January 1, 1998
Author(s)
Stephen W. Freiman
The 1997 NIST Ceramics Division Report is organized in the form of programs, emphasizing a desire to develop more extensive collaborations among both Division and Materials Science and Engineering laboratory personnel, and to conduct focussed activities on

Effect of Interface Properties on Microcracking of Iron Titanate

January 1, 1998
Author(s)
A Saigal, Stephen A. Langer, W Carter, M H. Zimmerman, K T. Faber, Lin-Sien H. Lum
It has been shown both experimentally and theoretically that mechanical properties are strongly dependent on the grain size in single-phase polycrystalline ceramics with large thermal expansion anisotropy [1,2]. This dependence is related to the residual

Evolution of the Microstructure of Plasma-Sprayed Deposits During Heating

January 1, 1998
Author(s)
Gabrielle G. Long, Andrew J. Allen, J Ilavsky
The evolution of the void microstructure of yttria-stabilized zirconia [YSZ] plasma-sprayed deposits [PSD] was studied as a function of heating in air from room temperature to 1400 C, and during a constant temperature hold at 1100 C for 19 hours. The

Small Angle Scattering Studies of Dendrimer Blends and Interpenetrating Polymer Networks

January 1, 1998
Author(s)
Barry J. Bauer, A Topp, T J. Prosa, Da-Wei Liu, C L. Jackson, Eric J. Amis
This report gives an overview about the first results of an investigation of mixtures that consist of dendrimers and conventional polymers. Poly[amido amine] PAMAM] or poly[propylene amine] [PPI] dendrimers were blended with linear polymers that contain

Interlaboratory verification of silicon nitride tensile creep properties

April 1, 1997
Author(s)
William E. Luecke, Sheldon M. Wiederhorn
Five laboratories tested NIST-supplied, pin-loaded, 76-mm-long tensile creep specimens at 1400 degrees C under a 150 MPa load using flag-based, laser extensometry, The laboratories reported failure time and strain and supplied the individual creep curves

Mechanical Properties of Aluminum Nitride Substrates

December 1, 1996
Author(s)
Jay S. Wallace, Lin-Sien H. Lum
Aluminum nitride (AlN),because of its high thermal conductivity, is seeing increased use for heat management applications of semiconductor devices. With the likelihood of large mechanical stresses, both during fabrication as well as in service, mechanical

Sources of Strain-Measurement Error in Flag-Based Extensometry

June 1, 1996
Author(s)
William E. Luecke, J French
This paper examines the sources of error in strain measurement using flag-based extensometry that uses either scanning laser or electrooptical extensometers, These errors fall into two groups: errors in measuring the true gauge length of the specimen

CAVITATION CONTRIBUTES SUBSTANTIALLY TO TENSILE CREEP IN SILICON NITRIDE

August 1, 1995
Author(s)
William E. Luecke, Sheldon M. Wiederhorn, B Hockey, Ralph Krause, Gabrielle G. Long
During tensile creep of a hot isostatically pressed (HIPed) silicon nitride, the volume fraction of cavities increases linearly with strain; these cavities produce nearly all of the measured strain. In contrast, compressive creep in the same stress and
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