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Search Publications by: Winnie Wong-Ng (Fed)

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Displaying 151 - 175 of 274

Phase Compatibility of the Thermoelectric Compounds in the Sr-Ca-Co-O System

April 14, 2010
Author(s)
Winnie K. Wong-Ng, Guangyao Liu, Joshua B. Martin, Evan L. Thomas, Nathan Lowhorn, James A. Kaduk
Two low-dimensional cobaltite series in the Sr-Ca-Co-O system have been investigated for their solid solution limit, structure, and compatibility phase relationships (850 deg C in air). Thermoelectric properties have been measured for selected members of

Structural properties and thermal conductivity of Na1-xGe3+z

April 2, 2010
Author(s)
Winnie K. Wong-Ng, Stevce Stefanoski, James A. Kaduk, Qingzhen Huang, Clifford R. Bowers, George S. Nolas, Beekman Mathew
Structural analyses as well as low temperature thermal conductivity is reported for the new phase in the Na-Ge system, Na1-xGe3+z. Specimens were characterized by thermal analysis, conventional and synchrotron powder X-ray diffraction, neutron powder

Interfacial reactions of Ba2YCu3O6+x with Coated Conductor Buffer Layer, LaMnO3

February 10, 2010
Author(s)
Winnie K. Wong-Ng, Guangyao Liu, Lawrence P. Cook, James A. Kaduk
Chemical interactions between the Ba2YCu3O6+x superconductor and the LaMnO3 buffer layers employed in coated conductors have been investigated experimentally by determining the phases formed in the Ba2YCu3O6+x - LaMnO3 system. The Ba2YCu3O6+x - LaMnO3 join

The 2009 Material Research Society (MRS) Spring Meeting Report

December 31, 2009
Author(s)
Winnie K. Wong-Ng
The 2009 Materials Research Society (MRS) Spring Meeting took place in San Francisco Moscone Center from April 13 through 17. This large-scale meeting included forty-one technical symposia, nine symposium tutorials, three poster sessions, a popular

RECENT INVESTIGATIONS OF Sr-Ca-Co-O THERMOELECTRIC MATERIALS

December 21, 2009
Author(s)
Winnie K. Wong-Ng, Guangyao Liu, Makoto Otani, Evan L. Thomas, Nathan Lowhorn, Martin L. Green, James A. Kaduk
Three low-dimension cobaltites in the Sr-Ca-Co-O system have been studied for their structure and thermoelectric properties. Using x-ray pole figure construction technique, a Ca3Co4O9 thin film showed excellent fiber texture but no ab in-plane texture. The

Reference X-ray Powder Diffraction Pattern of a New High-Pressure Phase, CaCo2O4

December 17, 2009
Author(s)
Winnie K. Wong-Ng, James A. Kaduk, Masaaki Isobe
Research in new cobaltites is important for waste heat recovery applications. A new calcium cobaltite phase, CaCo2O4, prepared under high pressure, has been reported recently to have a large Seebeck coefficient. This paper reports the reference x-ray

Enhanced Mass Transport in Ultra-Rapidly-Heated Ni/Si Thin-Film Multilayers

November 15, 2009
Author(s)
Lawrence P. Cook, Richard E. Cavicchi, Nabil Bassim, Susie Eustis, Winnie Wong-Ng, Igor Levin, Ursula R. Kattner, Carelyn E. Campbell, Christopher B. Montgomery, William F. Egelhoff Jr., Mark D. Vaudin
We have investigated multilayer and bilayer Ni/Si thin films by nano-differential scanning calorimetry (DSC) at ultra rapid scan rates, in a temperature-time regime not accessible with conventional apparatus. DSC experiments were completed at slower scan

Development of a Seebeck Coefficient Standard Reference Material

August 7, 2009
Author(s)
Nathan Lowhorn, Winnie Wong-Ng, John Lu, Evan L. Thomas, Makoto Otani, Martin L. Green, Neil Dilley, Jeffrey Sharp, Thanh N. Tran
We have successfully developed a Seebeck coefficient Standard Reference Material (SRM ), Bi2Te3, that is crucial for interlaboratory data comparison and for instrument calibration. Certification measurements were performed using two different techniques on

Thermoelectric and Structural Characterization of Ba2Ho(Cu3-xCox)O6+y

June 13, 2009
Author(s)
Winnie K. Wong-Ng, Z Yang, Y F. Hu, Qingzhen Huang, Nathan Lowhorn, Makoto Otani, James A. Kaduk, Martin L. Green, Q Li
The search for thermoelectric materials for power generation and for solid-state cooling have led to the increased interest of layered cobalt-containing oxides because of their thermal stability at high temperature and their desirable thermoelectric

A High-throughput Screening System for Thermoelectric Material Exploration Based on Combinatorial Film Approach

May 7, 2009
Author(s)
Makoto Otani, Evan L. Thomas, Winnie Wong-Ng, Peter K. Schenck, Nathan Lowhorn, Martin L. Green, Hiroyuki Ohguchi
A high-throughput system that consists of a combinatorial tool (a sputtering deposition tool and a pulsed laser deposition tool) and two property screening devices, developed at NIST, was used for thermoelectric material exploration. The thermoelectric

Thermopower of Co-doped FeSe0.82

April 1, 2009
Author(s)
Evan L. Thomas, Winnie K. Wong-Ng, Daniel P. Phelan
The effect of cobalt doping (0.05 ≤ x ≤ 0.50) on the thermopower of the newly discovered superconductor FeSe0.82 is investigated through electrical and thermal transport measurements. Our results point to the destruction of superconductivity at very low Co

Statistical analysis of a round-robin measurement survey of two candidate materials for a Seebeck coefficient Standard Reference Material

February 2, 2009
Author(s)
John Lu, Nathan Lowhorn, Winnie Wong-Ng, Weiping Zhang, Evan L. Thomas, Makoto Otani, Martin L. Green, Thanh N. Tran, Chris Caylor, Neil Dilley, Adams Downey, B Edwards, Norbert Elsner, S Ghamaty, Timothy Hogan, Qing Jie, Qiang Li, Joshua B. Martin, George S. Nolas, H Obara, Jeffrey Sharp, Rama Venkatasubramanian, Rhonda Willigan, Jihui Yang, Terry Tritt
In an effort to develop a Standard Reference Material (SRM ) for Seebeck coefficient, we have conducted a round-robin measurement survey of two candidate materials undoped Bi2Te3 and constantan (55% Cu and 45% Ni alloy). Measurements were performed in two

Round-Robin Studies of Two Potential Seebeck Coefficient Standard Reference Materials

January 14, 2009
Author(s)
Nathan Lowhorn, Winnie K. Wong-Ng, Weiping Zhang, John Lu, Makoto Otani, Evan L. Thomas, Martin L. Green, Thanh Tran
The scientific activities of NIST include the development and distribution of standard reference materials (SRM) for instrument calibration and inter-laboratory data comparison. Full characterization of a thermoelectric material requires measurement of the

Synthesis and Transport Properties of Framework-Substituted Cs 8 Na 16 Cu 5 Ge 131

January 13, 2009
Author(s)
Matthew Beekman, James A. Kaduk, J Gryko, Winnie Wong-Ng, Alexander J. Shapiro, George S. Nolas
We report the synthesis and temperature dependent transport properties of a new type II germanium clathrate, Cs8Na16Cu5Ge131 (space group Fd3m; a = 15.42000(9) ) . In comparison to the parent compound Cs8Na16Ge136, Cu substitution for Ge on the clathrate

Structural and thermoelectric properties of Bi2Sr2Co2Oy thin films on LaAlO3 (100) and fused silica substrates

January 12, 2009
Author(s)
Winnie K. Wong-Ng, Mark D. Vaudin, Shufang Wang, L Venimadhav, Shengming Guo, Ke Chen, Qi Li, A Soukiassian, D.G. Schlom, X.Q. Pan, D.G. Cahill, X. X. Xi
We have grown Bi2Sr2Co2Oy thin films on LaAlO3 (100) and fused silica substrates by pulsed laser deposition. The films on LaAlO3 are c-axis oriented and partially in-plane aligned with multiple domains while the films on fused silica are preferred c-axis

Local Structure of Cu in Cs8Na16Cu5Ge131 Type II Clathrate

January 8, 2009
Author(s)
Winnie K. Wong-Ng, Azzam Mansour, Matthew Beekman, George S. Nolas
We have used X-ray absorption spectroscopy (XAS) to investigate the local structure of Cu and Ge in the Cs8Na16Cu5Ge131 type II clathrate. We show that the local structure parameters, coordination number, and distances for Ge are consistent with those

Combinatorial Studies of Ba-Y-Cu-O Films for Coated-Conductor Applications

October 23, 2008
Author(s)
Winnie K. Wong-Ng, Makoto Otani, Igor Levin, Peter K. Schenck, Zhi Yang, Guangyao Liu, Lawrence P. Cook, Ron Feenstra, Wei Zheng, Marty Rupich
Phase relationships in bulk and thin film Ba-Y-Cu-O high-Tc superconductor system were determined at processing conditions relevant for industrial production of coated conductors. Our results demonstrated that the absence of BaY2CuO5 (which has a critical

Melting Equilibria of the BaF 2 -CuO x System

October 16, 2008
Author(s)
Winnie Wong-Ng, Lawrence P. Cook, J Suh
Since the BaF 2-CuO x system is a limiting binary of the overall quaternary reciprocal Ba,Y,Cu//F,O phase diagram, it provides an important frame of reference for studying the more complicated multi-component system. The phase diagrams of the BaF 2-CuO x

The 1998 American Ceramic Society Annual Meeting--A Centennial Celebration

October 16, 2008
Author(s)
Winnie Wong-Ng
The 1998 annual meeting of the American Ceramics Society (ACerS) and exposition represented a unique milestone. It was the beginning of the centennial celebration and it was a once-in-a-lifetime experience for the ACerS members. This very special meeting

Materials Science &Technology (MS&T) 2008 Conference & Exhibition

July 18, 2008
Author(s)
Winnie K. Wong-Ng
The Materials Science &Technology 2008 Conference & Exhibition took place in the David L. Lawrence Convention Center in Pittsburgh, Pennsylvania from October 5-9. The MS&T 2008 Conference was a great success, with a total more than 1000 papers presented in