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Topic Area: Materials Science

Displaying records 511 to 520 of 531 records.
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511. Phonons and Static Dielectric Constant in CaTiO^d3^ From First Principles
Topic: Materials Science
Published: 8/1/2000
Authors: Eric J Cockayne, Benjamin P Burton
Abstract: CaTiO^d3^ has a static dielectric constant that extrapolates to a value greater than 300 at zero temperature. We investigate the origin of this large dielectric response on a microscopic level, using first-principles plane-wave pseudopotential densi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850401

512. X-Ray Topography Study of Surface Damage in Single-Crystal Sapphire
Topic: Materials Science
Published: 2/9/2000
Authors: David R Black, Robert S. Polvani, Kate Medicus, H E. Burdette
Abstract: X-ray diffraction topography was used to investigate the relationship between sub-surface damage, near-surface microstructure, and fracture strength in a series of sapphire modulus of rupture (MOR) bars which had been fabricated to proof test fabrica ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850319

513. Secondary Ferrite Number Reference Materials: Gage Calibration and Assignment of Values
Series: Special Publication (NIST SP)
Report Number: 260-141
Topic: Materials Science
Published: 2/1/2000
Authors: Christopher N McCowan, Thomas Allen Siewert, D P Vigliotti, C M Wang
Abstract: Ferrite Numbers (FN) were assigned to blocks of stainless steel that serve as secondary ferrite reference materials (RM 8480 and 8481), and these specimens were placed in our Reference Materials inventory. These reference materials are used to calib ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851156

514. Structure and Microwave Dielectric Properties in the x Ca^d2^AlNbO^d6^: (1-x) Ca^d3^Nb^d2^O^d8^ System
Topic: Materials Science
Published: 2/1/2000
Authors: Julia Y. Chan, Terrell A Vanderah, Robert S. Roth, Winnie K Wong-Ng, B A Reisner, Richard G. Geyer
Abstract: The structure and dielectric properties of bulk ceramics in the xCa2AlNbO6: (1-x)Ca3Nb2O8 system were studied. Ca2AlNbO6 (P21/n, a = 5.3785(1) , b = 5.4158(1) , c = 7.6259(1) , b = 89.93(1)o) is a double perovskite with structure similar to CaTiO3 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850396

515. Structural investigation of (Sr^d4-{delta}^Ca^d{delta}^)PtO^d6^ Using X-Ray Rietveld Refinement
Topic: Materials Science
Published: 8/16/1999
Authors: Winnie K Wong-Ng, James A Kaduk, R A Young, F Jiang
Abstract: The structures of the solid solution series (Sr^d4-{delta}^Ca^d{delta}^)PtO^d6^, with {delta} = 0, 0.85(1), 2, and 3, have been investigated using the Rietveld refinement technique with laboratory x-ray powder data. A complete solid solution between ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850208

516. The International Institute of Welding: Report on 1998 Actions
Topic: Materials Science
Published: 5/3/1999
Author: Thomas Allen Siewert
Abstract: Commission V covers issues of weld inspection and quality control for the International Institute of Welding (IIW). This report summarizes the information presented at the 1998 Annual Assembly: descriptions of both research and draft ISO standards b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851212

517. Characterization of Ternary Compounds in the BaO:Fe^d2^O^d3^:TiO^d2^ System: Ba^d6^Fe^d45^Ti^d17^O^d106^ and BaFe^d11^Ti^d3^O^d23^
Topic: Materials Science
Published: 1/1/1999
Authors: Terrell A Vanderah, Winnie K Wong-Ng, B H. Toby, V. M. Browning, Robert D Shull, Richard G. Geyer, Robert S. Roth
Abstract: Single crystals of Ba^d6^Fe^d45^Ti^d17^O^d106^ and BaFe^d11^Ti^d3^O^d23^ were obtained as major and minor co-products, respectively, by slow-cooling an off-stoichiometric BaO:Fe^d2^O^d3^:TiO^d2^ melt. The former compound exhibits variable stoichiome ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850204

518. Sample-Angle Feedback for Diffraction Anomalous Fine-Structure Spectroscopy
Topic: Materials Science
Published: 5/1/1998
Authors: J O Cross, W Elam, V G Harris, J P Kirkland, Charles E. Bouldin, L B Sorensen
Abstract: Diffraction anomalous fine-structure (DAFS) experiments measure Bragg peak intensities as continuous functions of photon energy near a core-level excitation. Measuring the integrated intensity at each energy makes the experiments prohibitively slow, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850185

519. X-Ray Diffraction Topography of Sapphire for Windows and Domes
Topic: Materials Science
Published: 3/30/1998
Author: David R Black
Abstract: X-ray diffraction topography has been used as a nondestructive characterization tool to investigate single-crystal sapphire for window and dome applications. A variety of examples are shown that demonstrate the utility of x-ray diffraction imaging a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850182

520. Optimizing Residual Gas Analyzers for Process Monitoring
Topic: Materials Science
Published: 12/1/1997
Author: C R Tilford
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=100330



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