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401. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850430

402. Authentication and Dating of Biomass Components of Industrial Materials; Links to Sustainable Technology
Topic: Materials Science
Published: 10/1/2000
Authors: Lloyd A. Currie, D Klinedinst, R Burch, N Feltham, R Dorsch
Abstract: There are twin pressures mounting in U.S. industry for increased utilization of biomass feedstocks and biotechnology in production. The more demanding pressure relates to economic sustainability, that is, because of increased competition globally, b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831161

403. 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/ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850349

404. 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

405. 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

406. 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

407. 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

408. 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

409. 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

410. 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