Research interests

• Materials Characterization
• Electron Microscopy FIB, SEM, TEM etc
• Mechanical properties of materials including polymers, metals and ceramics
• Additive manufacturing
• Materials chemistry
• Crystallography
• Metallography
• Fracture behavior in materials

Current position(s)

Staff Scientist

Career path

Prior to joining LLNL, I worked at Sandia National Lab as a Principal Technologist in the materials characterization group and prior to that I worked in industry at BAE Systems, Balazs NanoAnalysis and the US Navy. I started at LLNL in 2022 working as the SME for FIB in building 235.

Subject Matter Expertise

SEM, FIB, EDS

Selected publications

Publications

2021

 York, Warren L; Ding, Dong; Ding Hanping; Sugar, Joshua D 2021, TEM Sample Preparation of Buried Interfaces in Porous Layered Materials, Microscopy and microanalysis, 2021-08, Vol.27 (S1), p.3466-3467

2020

Liu, Y. S., Keith G. Ray, Mathias Jørgensen, Tracy M. Mattox, Donald F. Cowgill, H. V. Eshelman, April M. Sawvel, Jonathan L. Snider, Warren Lee York, and Pavi Wijeratne. 2020. “Nanoscale Mg–B via Surfactant Ball Milling of MgB2: Morphology, Composition, and Improved Hydrogen Storage Properties.” The Journal of Physical Chemistry C 124(39):21761–71. doi: 10.1021/acs.jpcc.0c05142.

2019

York, Warren Lee, Dave Robinson, and Joshua D. Sugar. 2019. “A Method for FIB Liftout of Particles in Epoxy Resin.” Microscopy and Microanalysis 25(S2):910–11. doi: 10.1017/S1431927619005282.

Vega, Heidy, Thale R. Smith, Christopher W. San Marchi, Joshua Daniel Sugar, Raymond William Friddle, and Warren Lee York. 2019. “Hardness Variation of Microstructural Heterogeneities in Directed Energy Deposited 304L Stainless Steel.” Microscopy and Microanalysis 25(S2):2602. doi: 10.1017/S1431927619013746.

Catarineu, Noelle R., David Robinson, Norman Charles Bartelt, Joshua Daniel Sugar, Warren Lee York, Suzanne Vitale, and Xiaowang Zhou. 2019.“Electron Tomography and Energy Loss Spectroscopy of Helium Nanobubbles Formed in a Palladium Tritide (Poster).” Presented at the 12th International Conference on Tritium Science and Technology, Busan.

Walker, Matthew, Warren Lee York, Jeffrey Chames, Joshua D. Sugar, Kristen Frey, Herb Feinroth, and Eric Barringer. 2019. Silicon Carbide Multilayer Piping for 900C Supercritical CO2 Brayton Cycle: Chemical Compatibility in CO2. SAND2019-3379. Sandia National Laboratories.

Taylor, Caitlin, Brittany Muntifering, Samuel Briggs, Joshua Sugar, Katia Gibson, David Robinson, Warren Lee York, and Noelle Catarineu. 2019.“Advanced In-Situ Electron Microscopy Characterization of H and He Evolution in Materials.” Presented at the TMS, San Antonio.

Wang, Timothy C., F. Patrick Doty, Annabelle I. Benin, Joshua D. Sugar, Warren Lee York, Eric W. Reinheimer, Vitalie Stavila, and Mark D. Allendorf. 2019. “Get the Light out: Nanoscaling MOFs for Luminescence Sensing and Optical Applications.” Chemical Communications 55(32):4647–50. doi: 10.1039/c9cc01673b.

2018

York, Warren Lee, Douglas L. Medlin, Joshua D. Sugar, and Philip Noell. 2018. “A Method for Plan-View FIB Liftout of Near Surface Defects with Minimal Beam-Induced Damage.” Microscopy and Microanalysis 24(S1):842–43. doi: 10.1017/S1431927618004701.

Eaton, Samuel Wilson, Mark A. Rodriguez, Joshua D. Sugar, Warren Lee York, Paul Mariner, and Thomas J. Kulp. 2019. Characterization and Reproduction of Corrosion Products at the Westinghouse Springfields Nuclear Fuel Production Facility. SAND2019-8343. Sandia National Laboratories.

Eaton, Samuel Wilson, Joshua D. Sugar, Warren Lee York, and Thomas J. Kulp. 2019. Structural and Optical Changes in Soda Lime Glass Exposed to Hydrofluoric Acid Vapor. SAND2019-8342. Sandia National Laboratories.

Robinson, David, Noelle Catarineu, Norman Charles Bartelt, Victoria Lebegue, Aidan Higginbotham, Roopjote Atwal, Katarina Gibson, Ryan Nishimoto, Warren Lee York, and Joshua D. Sugar. 2018. Synthesis of Palladium and Pd Alloy Powders by Aqueous Chemical Reduction. SAN2018-12414. Sandia National Laboratories.

Catarineu, Noelle Ruiz, Norman Charles Bartelt, Joshua Daniel Sugar, Warren Lee York, Suzanne Vitale, Xiaowang Zhou, E. Lynn Bouknight, Kirk L. Shanahan, and David Robinson. 2018.“3D Mapping of Helium Nanobubbles in a Pd Alloy by Electron Tomography (Poster).” Presented at the Molecular Foundry 2018 Annual User Meeting, Berkeley.

Taylor, Caitlin Anne, David Robinson, Joshua Daniel Sugar, Noelle Ruiz Catarineu, Warren Lee York, Brittany R. Muntifering, and Khalid Mikhiel Hattar. 2018.“Comparison of Helium Aging in Ion Implanted and Tritium Loaded Materials.” Presented at the Tritium Focus Group, Albuquerque.

Taylor, Caitlin Anne, Brittany R. Muntifering, Joshua Daniel Sugar, David Robinson, Clark S. Snow, Noelle Ruiz Catarineu, Warren Lee York, and Khalid Mikhiel Hattar. 2018.“Direct Comparison of Helium Aging in Ion Implanted and Tritium Loaded Materials.” Presented at the Conference on Application of Accelerators in Research and Industry, Grapevine, TX.

Catarineu, Noelle Ruiz, David Robinson, Norman Charles Bartelt, Joshua Daniel Sugar, Xiaowang Zhou, Mark Homer, Warren Lee York, Suzanne Vitale, Caitlin Anne Taylor, and Clark S. Snow. 2018.“Characterizing Nano-Scale Helium Bubbles within Metals by Electron Energy Loss Spectroscopy.” Presented at the Tritium Focus Group, Albuquerque.

Catarineu, Noelle Ruiz, David Robinson, Xiaowang Zhou, Norman Charles Bartelt, Joshua Daniel Sugar, Donald F. Cowgill, Mark Homer, Warren Lee York, Suzy Vitale, and Caitlin Anne Taylor. 2018.“Nucleation and Growth of Helium Nanobubbles in Palladium Alloy Tritides.” Presented at the Tritium Focus Group, Oak Ridge, TN.