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Displaying records 391 to 400 of 408 records.
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391. Phase Equilibria and Dielectric Behavior in the CaO:Al^d2^O^d3^:Nb^d2^O^d5^ System
Topic: Materials Science
Published: 11/1/2000
Authors: Terrell A Vanderah, W Febo, Julia Y. Chan, Robert S. Roth, J. M. Loezos, L D. Rotter, Richard G. Geyer, B A Reisner, Dennis Brooke Minor
Abstract: 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. Inde ...

392. Structural Study of Ba^d11^Fe^d8^Ti^d9^O^d41^ by X-Ray Diffraction
Topic: Materials Science
Published: 9/1/2000
Authors: T Siegrist, C Svensson, Terrell A Vanderah, Robert S. Roth
Abstract: The crystal structure of Ba^d11^Fe^d8^Ti^d9^O^d41^ was determined using single-crystal and powder X-ray diffraction nethods. This new phase crystallizes in the hexagonal space group P6^d3^/mmc (No 194) (a=5.7506(3) , c=61.413(2) ; Z=2; Pcalc=5.75 g/ ...

393. 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 ...

394. 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 ...

395. 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 ...

396. 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 ...

397. 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 ...

398. Optimizing Residual Gas Analyzers for Process Monitoring
Topic: Materials Science
Published: 12/1/1997
Author: C R Tilford

399. The Economics of New-Technology Materials: A Case Study of FRP Bridge Decking
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 5864
Topic: Materials Science
Published: 7/1/1996
Authors: M A Ehlen, Harold E. Marshall
Abstract: Many new materials are bing developed from polymers, metals, and ceramics. Industry is beginning to introduce some of these high-performance or new-technology materials in construction and manufacturing applications because the materials have advant ...

400. LIFE-CYCLE COSTING MANUAL for the Federal Energy Management Program, NIST Handbook 135, 1995 Edition
Series: Handbook (NIST HB)
Report Number: 135
Topic: Materials Science
Published: 2/1/1996
Authors: S Fuller, Steve Petersen
Abstract: Handbook 135 is a guide to understanding the life-cycle cost (LCC) methodology and criteria established by the Federal Energy Management Program (FEMP) for the economic evaluation of energy and water conservation projects and renewable energy project ...

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