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Author: winnie wong-ng

Displaying records 111 to 120 of 154 records.
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111. Crystal Structure of the Monoclinic Perovskite Sr^d3.94Ca^d1.31^Bi^d2.70^O^d12^
Published: 12/1/2000
Authors: Winnie K Wong-Ng, James A Kaduk, Qingzhen Huang, Robert S. Roth
Abstract: The crystal structure of the low temperature oxidized form of Sr^d3.94^Ca^d1.31^Bi^d2.70^O^d12^ has been determined using a combined Rietveld refinement technique with neutron, synchrotron, and powder x-ray diffraction data. The structure is pseudo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850377

112. NIST Centennial Celebration - Crystallographic Highlights
Published: 12/1/2000
Authors: Winnie K Wong-Ng, Alan D. Mighell, Gabrielle Gibbs Long, Leonid A Bendersky, Vicky Lynn Karen, J D. Barnes, G L. Gilliland, T Gallagher, Terrell A Vanderah, R G Munro, Paul E Stutzman, H F McMurdie, S Block, Gasper J. Piermarini, Robert S. Roth, Antonio Santoro, Curt W Reimann, C R Hubbard, John Werner Cahn, E Prince, D R. Lide, H Ondik, Lawrence P. Cook, T Siegrist, G DeTitta, L Finger, H Evans, E Gabe, G Enright, J T. Armstrong, M Levenson, Laurence Chung Lung Chow, Shozo Takagi, M Mathew, Jeffrey W Lynn, H S Peiser
Abstract: NIST has a long history of crystallographic research, and has made significant contributions to the advancement of the fields of crystallography, biology, and materials science. The articles are contributed by scientists from various divisions at NIS ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850460

113. NIST Centennial Celebration Symposium Highlight
Published: 11/15/2000
Authors: Alan D. Mighell, Winnie K Wong-Ng
Abstract: The Centennial Celebration of the National Institute of Standards and Technology (NIST), formerly known as the Bureau of Standards (NBS), takes place in the year 2001. NIST has a long history (>50 years) of crystallographic research, and has made sig ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850550

114. Phase Equilibria of Ag with (Bi,Pb)-Sr-Ca-Cu-O (BSCCO) Oxides and With Superconducting Pb2223 Under Various Oxygen Pressures
Published: 10/1/2000
Authors: Lawrence P. Cook, Winnie K Wong-Ng
Abstract: The partial phase diagrams of Ag with the constituent oxides of the Pb-BSCCO system (Pb,Bi:Sr:Ca:Cu:O) have been investigated, with emphasis on initial melting. These diagrams include the binary systems Ag-SrO, Ag-CaO, Ag-CuO, Ag-Bi^d2^O^d3^, Ag-PbO ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850366

115. Flux Pinning of Bi^d2^Sr^d2^CaCu^d2^O^d8+{gamma}^/Ag Superconductors Utilizing (Sr,Ca)^d14^Cu^d24^O^d41^ Defects and Nanophase Al^d2^O^d3^ and Au Particles
Published: 6/1/2000
Authors: T J Haugan, Winnie K Wong-Ng, Lawrence P. Cook, H J Brown, L Swartzendruber, D T Shaw
Abstract: Investigations into flux pinning of Bi^d2^Sr^d2^ CaCu^d2^O^d8+{gamma}^ /Ag (Bi-2212/Ag) thick film conductors utilizing micron-sized (Sr,Ca)^d14^Cu^d24^O^d41^ and nanophase Al^d2^O^d3^ and Au particles are described. Addition of defect particles de ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850374

116. Melting Equilibria of the 223 (Bi,Pb)-Sr-Ca-Cu) High T^dc^ Superconductor in Oxygen
Published: 4/17/2000
Authors: Winnie K Wong-Ng, Lawrence P. Cook
Abstract: Melting information for the Pb-doped 2223 high T^dc^ phase in the Bi(Pb)-Sr-Ca-Cu-O system is important for the superconducting wire and tape industry. This paper examines the melting equilibria of a composition Bi^d1.8^Pb^d0.4^Sr^d2^Ca^d2.2^Cu^d3^O ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850318

117. Vapor Pressure of the SrPbO^d3^ Perovskite Phase
Published: 4/1/2000
Authors: Lawrence P. Cook, Winnie K Wong-Ng
Abstract: The perovskite phase SrPbO^d3^ is important as a buffer and indicator of PbO chemical potential (at fixed p^dO2^ ) according to the reaction: 2 SrPbO^d3^ --> Sr^d2^PbO^d4^ + PbO(g) + 1/2 O2 (g), where the term PbO(g) includes several Pb-cont ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850361

118. Effect of Ag on the Primary Phase Field of High T^dc^ (Bi,Pb)-2223 Superconductor
Published: 2/1/2000
Authors: Winnie K Wong-Ng, Lawrence P. Cook, W Greenwood, Anthony J Kearsley
Abstract: The subsolidus equilibria and the primary phase field (crystallization field) of the 110K high T^dc^ (Bi,Pb)-2223 ([Bi,Pb]:Sr:Ca:Cu) superconductor in the presence of Ag have been determined under 7.5 volume % O^d2^ (92.5 % Ar). A total of 29 six-pha ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850337

119. Phase Relations of the SrO-Ho^d2^O^d3^-CuO^dx^ System
Published: 2/1/2000
Authors: Winnie K Wong-Ng, J Dillingham, Lawrence P. Cook
Abstract: The phase diagram of the SrO-R^d2^O^d3^-CuOx system, where R=Ho, was investigated in air. The tie-line relationships of this system were determined. Two ternary phases were found, namely, the green phase SrHo^d2^CuO^d5^ and the A14-24 solid solutio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850276

120. Structure and Microwave Dielectric Properties in the x Ca^d2^AlNbO^d6^: (1-x) Ca^d3^Nb^d2^O^d8^ System
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



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