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Winnie Wong-Ng (Fed)

Research chemist; Materials Measurement Science Division, NIST

Research Interests

  • Materials for energy applications (including energy conversion materials for thermoelectric and photocatalysis, and energy storage).

  • Thermoelectric standards, metrology, and crystallographic data (Seebeck coefficient, resistivity, and thermal conductivity).  
  • Sorbent materials for sustainability (porous materials include metal organic frameworks (MOFs), zeolites, and porphyrins).
  • High throughput combinatorial approach (pulsed laser deposition technique for film synthesis) for novel materials discovery and property optimization for energy conversion and storage applications.
  • Crystallography, phase equilibria, and crystal chemistry of energy materials to understand their structure and property relationships. Structural studies involve synchrotron X-ray and neutron diffraction techniques.
Crystal structures
Figure 1(left): Synchrotron X-ray crystal structure of a Type-I Clathrate thermoelectric phase Eu2Ga11Sn35; Figure 2(Center): Crystal structure of a flexible pillared Ni(CN)4-based Hoffman-Type Metal Organic Framework (MOF) for CO2 capture application; Figure 3 (right): Schematic of the high-performance thermoelectric oxide Ca3Co4O9.

Postdoctoral Research Opportunities

(1) Thermoelectric, Battery, and other Energy Conversion Materials

(Research opportunity No. 50.64.31.B6767)
The energy crisis has spurred intensive research activities in energy conversion and storage materials. For example, recent improvements in thermoelectric conversion efficiency have made thermoelectric materials attractive to the automotive industry for waste heat recovery applications, as well as in the environmental area for reliable solid-state refrigeration. Batteries have experienced fast-growing interest driven by new demands from a wide spectrum of applications. Specific research opportunities include (1) crystal structure and property relationships and measurements of novel thermoelectric and battery materials (Seebeeck coefficient, electrical resistivity, and thermal conductivity for thermoelectrics, and ionic conductivity for solid-state battery materials), (2) development of standard reference materials for battery material measurements, (3) deposition of combinatorial thin film libraries using a state-of-the-art sputtering/pulsed laser tool, (4) utilization of NIST first-in-world high-throughput techniques for mapping Seebeck coefficient and electricity resistivity for thermoelectrics. Plans are being developed for mapping ionic conductivity of solid-state electrolytes for battery applications, (5) understanding of battery degradation mechanisms. The thermoelectric and battery materials of interest include thin films, single crystals, and bulk materials. Opportunities also exist to investigate other materials and develop additional high-throughput methods for photovoltaics and photocatalysis for sustainable energy applications.
For more information...

(2) Carbon (CO2) Capture, Selective Gas Sorbent Materials, and Carbon Sequestration

(Research opportunity No. 50.64.31.B7417)
Many industrial processes generate carbon dioxide as a by-product, which is released to the atmosphere and contributes to global warming. To address the increasing urgency of mitigating global warming, clean, low-carbon-dioxide emission technologies must be complemented with more aggressive carbon capture technologies, including those for the direct air capture (DAC) of carbon dioxide, and its permanent mineralization or sequestration through appropriate carbonation processes. Development of these technologies is critical to meet U.S. energy and manufacturing needs in an environmentally sustainable manner. Low carbon emission and direct carbon capture technologies depend on transient gas/solid material interactions. Such interactions cannot be inferred from initial or final state materials property measurements such as sorbent microstructure, but must be measured in situ during the sorption or release process. This project focuses on the design, construction, and application of a suite of in situ measurement platforms for use with NIST’s state-of-the-art neutron and synchrotron X-ray scattering facilities [1], capable of interrogating critical carbon capture properties across the range of candidate carbon dioxide sorbent solid materials, as well as candidate materials, both natural and fabricated, for final mineralization or sequestration of carbon dioxide through carbonation. Measurements will focus on in situ determination of changes in structure, microstructure, atomic bonding, and dynamics in sorbent materials during the sorption and release of carbon dioxide under controlled conditions of temperature, pressure, humidity, and atmosphere, or in the case of mineralization as a function of carbonation reaction. Where possible, X-ray or neutron diffraction abd scattering analysis [2] and thermogravimetric analysis will be carried out in situ with samples that are simultaneously undergoing evolved gas analysis. The experimental measurements will be complemented by computer model simulations using available capabilities based on methods such as density functional theory (DFT). [3]
For more information...

Professional Activities

 (1) American Ceramic Society (ACerS)

  • Member, Board of Directors, 2022-2025
  • Electronic Division Trustee, 2013-2016            
  • Associate Editor, J. American Ceramic Society, since 2012
  • Chair, Electronics Division, 2005-06     
  • Member, ACerS Publication Committee, 2013-15
  • Member, ACerS Nominating Committee, 2008-10   

 (2)  American Crystallographic Association (ACA)

  • Local chair, ACA annual meeting, 1998            
  • Chair, Continuing Education Committee, 2002-2003
  • Chair, (Data, Standards & Computing Committee), 2009-2010   
  • Member, Succession Committee, 2015-2016

 (3)  US National Committee for Crystallography (USNC/Cr)

  • Secretary and Treasurer, 2000-03              
  • Member-at-large, 1999

 (4)  International Centre for Diffraction Data (ICDD)

  • Board of Directors, Member-at-large, 2010-2014; vice-chair, 2020-2024          
  • Editor, Powder Diffraction International Reports, 1999-present
  • Consulting editor, PDF, 1993-present             
  • Chair, Ceramics Subcommittee,1992-2010, 2014-2020

(5) Applied Superconductivity Conference (ASC)

  • Board of Director, member-at-large, 2006-2012

(6) Boise State University

  • Adjunct Professor, Materials Science and Engineering Department, 2014-present.

Summary of Scientific Output

  • Publications: (> 360 scientific papers including 7 book chapters and 1 handbook chapter)

  • Phase diagrams for oxide systems: >50 (published in various Journals and Phase  Diagrams for Ceramists published by the American Ceramic Society)
  • X-ray standard reference powder diffraction patterns: > 1000 patterns (published in Powder Diffraction File (PDF))
  • Editor/co-editor: 28 books
  • Standard reference materials (SRMTM) and Data: Ruby Spheres (SRM1990 for single crystal X- Ray diffractometer calibration); Bi2Te3 (SRM 3451 for low-temperature Seebeck Coefficient standard); SiGe (SRM 3452 for high-temperature Seebeck Coefficient standard)
  • Talks/presentations: 300 (including 80 invited)
  • Symposia/workshops organized: > 50
  • Post-docs/research associates mentored: >15
  • Graduate/undergrad/HS students mentored   >20

Significant contributions from the above record are a collection of phase diagrams of complex multi-component ceramic systems and crystal structures for materials processing; structure and property correlations of materials for electronic, energy, and carbon mitigation applications; standard reference data and materials for phase analysis and instrument calibration; modeling work for understanding materials behaviors; and high throughput thin film screening techniques for novel materials discovery.


  • US Department of Commerce Silver Medal Award, 2021
  • Induction into College of Science Hall of Distinction, Louisiana State University, 2020
  • Distinguished Life Member of American Ceramic Society (ACerS) 2019
  • Academician of the World Academy of Ceramics (WAC), 2018
  • Fellow of the American Association for the Advancement of Science (AAAS), 2017
  • Distinguished Fellow of International Centre for Diffraction Data (ICDD), 2017.
  • Best Poster Award, ICDD Technical meetings, 2013, 2015.
  • Fellow of the American Crystallographic Association, 2014.
  • ICDD Leadership Award in Materials Analysis, 2014.
  • ICDD Leadership Award (as a member of the Board of Directors), 2012.
  • US Department of Commerce Bronze Medal Award, 2008.
  • Richard & Patricia Spriggs Phase Equilibria Award, ACerS, 2007.
  • Recognition from ACerS for serving as Chair of the Electronics Division, 2005-2006.
  • Howard McMurdie Powder Diffraction Award, ICDD, 2004.
  • US Department of Commerce Bronze Medal Award, 2002.
  • Fellow of ACerS, 2002.
  • PDF-4 Consulting Editor Award, ICDD, 2002.
  • Fellow of ICDD, 2000.
  • Recognitions from MRS as symposia organizer (2005, 1999) & short course organizer (1992).
  • Recognitions from ACerS as symposia organizer (1998, 1999, 2001-2007).
  • Recognitions from US Department of Energy (DOE) for receiving the highest scores in DOE Superconductivity Program Peer Reviews, 1997, 1999, and 2001 (plaques or certificates).
  • Recognitions from the Association of NIST Asian Pacific Americans for serving as President, 2000-2003.
  • ICDD citations for distinguished contributions to the Powder Diffraction File (1996,1998-2006).
  • Member at large, Phi Kappa Phi, Phi Lambda Upsilon, Iota Sigma Pi, Sigma Xi

Selected Publications

Development of a Seebeck Coefficient Standard Reference Material

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


Structural and thermal properties of Eu2Ga11Sn35

Wilarachchige Gunatilleke, Mingjian Zhang, Winnie Wong-Ng, Peter Zavalij, George S. Nolas
Clathrates have been reported in a variety of different structure types, however, inorganic clathrate-I materials with a low-cation concentration have yet to be
Created October 9, 2019, Updated May 8, 2023