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APT Positions Available

OPEN POSITIONS


Postdoctoral Experimentalist Researcher: Immediate Opening

Northwestern University
Evanston Illinois, USA

There is an immediate opening for a postdoctoral researcher at Northwestern University in the department of materials science and engineering, to perform experimental research on Ni-Cr-Fe-based austenitic heat-resistant alloys with a high Cr content, which are widely used in petrochemical and steam-methane reformer plants and in solid-oxide fuel cells because of their excellent heat- oxidation- and corrosion-resistance. We are using a wide range of state-of-the-art characterization instruments: scanning electron- and transmission electron-microscopy, energy dispersive spectroscopy, and atom probe tomography. Additionally, we are employing mean-field calculations (ThermoCalc and Dictra) in parallel with the experimental research, prof. Peter Voorhees, to understand in great depth the microstructures obtained because of different carburization, oxidation, and water vapor treatments, with the aim of improving the current Ni-Cr-Fe-based austenitic alloy. The experimental and simulation approaches complement and supplement one another. Salary will be commensurate with experiences and skill sets.

S. I. Baik, S. Shu, M. Kazemzadeh-Atoufi, et. al., P. W. Voorhees, D. N. Seidman, accepted for publication in Scripta Materialia, (2022).

S. Shu, X. Hu, S. I. Baik, M. Kazemzadeh-Atoufi, et al., P. W Voorhees, D. N Seidman, Scripta Materialia, 197, 113792 (2021)

For more information, or to apply, contact David N. Seidman or Peter W. Voorhees.




Postdoctoral Research Associate - Atom Probe Tomography of Heat-resistant Steels

Oak Ridge National Laboratory
Oak Ridge, TN, 37830, USA

Overview:

Oak Ridge National Laboratory is the largest US Department of Energy science and energy laboratory, conducting basic and applied research to deliver transformative solutions to compelling problems in energy and security.

 

We are seeking a Postdoctoral Research Associate who will support the Materials MicroAnalysis (MM) Group in the Nanomaterials Characterization section, Center for Nanophase Materials Sciences (CNMS), Physical Sciences Directorate (PSD) at Oak Ridge National Laboratory (ORNL). The postdoctoral research associate will focus on performing atom probe tomography (APT) to advance our understanding of hydrogen embrittlement in heat-resistant steels and alloys, as part of the High-Performance Materials Program of the DOE Office of Fossil Energy and Carbon Management.

 

As part of our research team, you will be leading the APT effort to understand hydrogen embrittlement in heat-resistant steels after creep and creep fatigue tests at atmosphere and in a hydrogen-rich environment.  Your responsibilities will include aiding the development of a hydrogen charging station and cryogenic transfer into a local electrode atom probe (CAMECA LEAP 4000XHR), collecting, and analyzing APT data with a focus on linking the nanoscale hydrogen distribution to mechanical properties, and performing basic scanning transmission electron microscopy (STEM) and scanning electron microscopy (SEM) characterization.  This position is part of a collaborative effort with a diverse group of experimentalists, theorists, and data scientists across different organizations within ORNL, the National Energy Technology Laboratory (NETL), and Los Alamos National Laboratory (LANL). 

 

Major Duties/Responsibilities: 

  • Conduct materials research using APT and STEM, which will focus on nanoscale structure and composition measurements of 347H subjected to creep fatigue tests under atmosphere and hydrogen-rich environments
  • Aide in the development of APT hydrogen imaging capabilities at ORNL including the development of a deuterium charging station and cryogenic, vacuum transfer to the atom probe
  • Work with the High-Performance Materials Program team across multiple laboratories to correlate the APT and STEM studies with theory and mechanical properties to fully understand structure, composition, property relationships
  • Responsible for presenting and reporting research and publishing scientific results in peer-reviewed journals in a timely manner
  • Ensure compliance with environment, safety, health, and quality program requirements
  • Maintain strong dedication to the implementation and perpetuation of values and ethics

 

Basic Qualifications:

  • A PhD in Physics, Materials Science & Engineering, Chemistry, or a related field completed within the last 5 years
  • Experience with APT sample preparation, data acquisition, and data analysis
  • Hands-on STEM and SEM experience

 

Preferred Qualifications:

  • An excellent record of productive and creative research demonstrated by publications in peer-reviewed journals and/or presentations at conferences
  • Strong background in APT data acquisition/processing
  • Some understanding or experience in deuterium charging of APT specimens
  • Background in STEM imaging, data acquisition/processing, STEM-EELS, and STEM- EDS
  • Experience with focus ion beam milling (FIB)
  • Excellent written and oral communication skills and the ability to communicate in English to an international, scientific audience
  • Motivated self-starter with the ability to work independently and to participate creatively in collaborative teams across the laboratory 
  • Ability to function well in a fast-paced research environment, set priorities to accomplish multiple tasks within deadlines, and adapt to ever changing needs


Please submit three letters of reference when applying to this position. You can upload these directly to your application or sent them to postdocrecruitment@ornl.gov.

For more information, or to apply online, click here.



Post-doctoral position Atom Probe Tomography driven by ultrashort pulses in the extreme ultraviolet (EUV)
Groupe de Physique des Matériaux,
76801 SAINT ETIENNE DU ROUVRAY CEDEX
FRANCE

Spatially coherent sources of high-energy extreme-ultraviolet (EUV) photons and the tight focusing associated to the EUV beams are required for various scientific and industrial applications such as nanoscale imaging by atom probe tomography. The atom probe tomography (APT) is an advanced characterization method with very high spatial resolution that allows performing analytical imaging of materials in three dimensions at the atomic scale [Blavette1993, Gault2006]. Remarkable advances in the analysis of insulating materials were only achieved using UV laser pulses (around 340-400 nm) thanks to their high photon energy, thus paving the way for APT exploitation in new areas such as geophysics and biology. The use of EUV sources with photon energy up to 20 eV will allow the analysis of ultrawide band gap materials and will also improve the chemical composition measurements.

This project aims first to build a EUV photons source based on High Harmonic Generation (HHG) in large bandgap material (amorphous silica) using a long wavelength (mid-infrared) few-cycle (sub-30 fs) laser. Indeed, HHG in amorphous silica has already enabled the production of high photon flux at energies up to 25 eV [You2017].

The second objective will concern the coupling of the EUV source to an APT chamber to analyse wide band-gap materials in order to explore the evaporation process induced by such high energy photons and thus evaluate their potential for APT’ performances improvement [Vella2013]. The generation of EUV light in large band-gap materials and its application to APT are in the focus of the ANR project (Flex-UV) that will be conducted in collaboration between the GPM group (The University of Rouen, gpm.univ-rouen.fr, the laboratory LOA (École Polytechnique https://loa.enstaparis.fr/the-laboratory/organization/) and the laboratory Xlim (The University of Limoges : https://www.xlim.fr/)

Post-doctoral position (starting from October/November 2022)

The work consists to develop an optical bench to generate EUV pulses by focusing a fs fiber laser on oxide materials. After characterization, the EUV light will be coupled to the Atom Probe Tomography chamber, assuring the focusing of EUV wavelengths on the nanometric sample. The work will be aimed at the activation and optimization of the ATP results, such as time-of-flight spectra, and the study of photo-ionization process. The successful candidate can be specialized in physics with particular knowledge in optics, non-linear optics and laser-matter interactions. Previous experience in high harmonic generation, atom probe tomography and/or focused ion beam milling will be highly appreciated.

Contact Angela Vella for more information or to apply.




Post-Doctoral Research Position, The University at Buffalo

Professor Baishakhi Mazumder at the Materials Design and Innovation department in the School of Engineering and Applied Sciences is seeking candidates to fill a post-doctoral research position. The candidate will be involved in research activities in characterizing nanoscale materials through atom probe tomography and transmission electron microscopy. The specific programs funding this research involves understanding the nanoscale chemistry including defects and doping behavior in oxide and nitride materials used for power, opto-electronics, and quantum applications.

Description of job duty:
The candidate will be involved in research activities in characterizing nanoscale materials through atom probe tomography and transmission electron microscopy. The specific programs funding this research involve understanding defects and doping behavior in oxide and nitride materials used for power electronics and quantum applications. Successful candidates in this position will be expected to publish in peer-reviewed journals, present at professional society conferences, assist in report writing to the sponsors of these programs, and provide guidance of graduate students in these topics.

Minimum qualification:
The successful candidate should hold a doctorate degree in Materials Science & Engineering or a closely related field with demonstrated experience and expertise in one or more of the areas of atom probe tomography, cross-correlative microscopy, transmission electron microscopy, and focus ion beam specimen preparation. Knowledge of machine learning algorithms will be a plus.

Job Responsibilities:
• Publish in peer-reviewed journals.
• Present at professional society conferences.
• Assist in report writing to the sponsors of these programs.
• Provide guidance to graduate students on these topics

Contact Maishakhi Mazumder, PhD by clicking here.


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