An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
A model for size-, load-, and velocity-dependence of friction at micro/nanoscale is proposed. During multiple-asperity contact, friction force is equal to the real area of contact multiplied by the interfacial shear strength. The real area of contact
Ivar E. Reimanis, C Seick, K Fitzpatrick, Lin-Sien H. Lum, S Landin
Polycrystalline ceramic composites, comprised of primarily b-eucryptite (LiAlSiO4) and lithium aluminate (LiAl5O8) crystals, with a near-zero coefficient of thermal expansion were examined with indentation experiments. A unique behavior is reported
This paper is a summary of a workshop session during the Workshop on Biomedical Materials and Devices, held June 13-14, 2001. The workshop is part of a series of workshops and topical meetings organized by NIST in the area of biomedical technology. The
D M. Saylor, J Fridy, B S. El-Dasher, K Y. Jung, Anthony D. Rollett
Techniques are described that have been used to create a statistically representative three-dimensional model microstructure for input into computer simulations using the geometric and crystallographic observations from two orthogonal sections through an
Joseph Woicik, Eric L. Shirley, Daniel A. Fischer, S Sambasivan, C R. Ashman, C S. Hellberg, H Li
Ferroelectric crystals possess an electric dipole moment even in the absence of an external electric field. In order for this spontaneous polarization to arise, the center of positive charge of the crystal must displace from its center of negative charge
Stress measurements in the thermally grown oxide layer of thermal barrier coatings are presented. Stresses were determined from photoluminescence measurements made through the zirconia top layer as a function of the number of thermal cycles
An update of the NIST Standard Reference Database Number 30, the Structural Ceramics Database, has been completed. This update, designated SCD Update (April 2003), increases the number of source entries by 100 citations and increases the total number of
Winnie Wong-Ng, Lawrence P. Cook, F Jiang, L Swartzendruber, P Sastry
The subsolidus phase equilibria involving the Bi-2223(Bi 2Sr 1.9Ca 2.1Cu 3O 10+x) phase in the Bi-Sr-Ca-Cu-O system (BSCCO) were investigated at 840-850The subsolidus phase equilibria involving the Bi-2223(Bi2Sr1.9Ca2.1Cu3O10+x) phase in the Bi-Sr-Ca-Cu-O
For applications of phase equilibria to coated conductor processing, phase diagrams constructed under carbonate-free conditions should be employed. Using special apparatus and a procedure for preparing carbonate-free precursors based on BaO, phase diagrams
The purpose of this document is to propose a standard procedure for measuring the thermal conductivity of insulating thin films on silicon substrates. The initial part of the assessment is a review of several measurement methods that have been used to
Creep experiments were conducted on a commercial grade of silicon nitride (AS800) over a wide range of temperatures and stresses: 1200oC to 1370oC; 50 MPa to 400 MPa. Cavitation always accompanied creep. As with other grades of silicon nitride, the rate of
Gateway to the New Millennium was the theme of the 102nd annual meeting of the American Ceramic Society which took place in St. Louis, Missouri from April 29 to May 3, 2000. A brief description of both the scientific and social program of this meeting is
The 1999 Material Research Society Fall Meeting took place in Boston Copley Plaza from November 26 to December 3. This was the first time that MRS has used the spacious Hynes Convention Center as the primary meeting site, with the Marriott Hotel as an