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Edward Garboczi, Ann Debay, Orion Kafka, Newell Moser, Douglas Rickman, Ryan Wilkerson
Lunar regolith simulants are manufactured in order to provide a higher volume, much less expensive and more available source of material, compared to real lunar regolith material, upon which to test various instruments and machines that are being designed
Due to their exceptional properties, hard materials such as advanced ceramics, metals, and composites have enormous economic and societal values, with applications across numerous industries. Understanding their microstructural characteristics is crucial
Ann Chiaramonti Debay, Daniel Schreiber, Karen Kruska, Kayla Yano
Atom probe tomography (APT) is a powerful analytical technique whose strengths lie in its combination of three-dimensional reconstructions, (sub)nanometer spatial resolution, and nominally equal sensitivity to all elements across the periodic table. An
Jay Goguen, Andrew Sharits, Ann Chiaramonti Debay, Thomas V. Lafarge, Edward Garboczi
Samples of soils collected by the Apollo 11 mission (10084) and the Apollo 14 mission (14163) were obtained from the NASA CAPTEM program. The particle size, shape, and internal porosity were characterized in three dimensions (3D) using a combination of X
A compact cold sintering stage was constructed to densify ceramic samples in capillary tubes for the purpose of conducting in situ experiments designed to elucidate fundamental cold sintering mechanisms. The stage was used to successfully densify samples
Fan Zhang, Russell Maier, Igor Levin, Andrew J. Allen, Jun-Sang Park, Peter Kenesei, Ivan Kuzmenko, Jan Ilavsky, Pete Jemian
The ceramic cold sintering process (CSP) offers an eco-friendly approach to producing fully dense ceramics at low temperatures. However, an incomplete mechanistic understanding hinders its optimization and widespread adoption. In this study, we analyze the
Eoin McAleer, M Alazzawi, C Hwang, Jacob LaManna, David Jacobson, R.A. Haber, E. Koray Akdogan
Stereolithography of ceramics remains one of the most powerful additive manufacturing routes for the creation of intricate ceramic parts. Despites its strength as a forming tool, ceramic stereolithography requires a challenging debinding stage due to the
Andrew J. Allen, Russell Maier, Fan Zhang, Ivan Kuzmenko, Jan Ilavsky
In order for ceramic additive manufacturing (AM) to achieve its full potential, it is increasingly important to develop a more rigorous understanding of fundamental phenomena that govern the kinetics and thermodynamics of ceramic AM processes. For some AM
Alline F. Myers, Shozo Takagi, Stanislav Frukhtbeyn, Laurence Chow, Veronika Szalai, Lonnie Cumberland, Ileana Pazos, Eaman Karim
Ionizing radiation-induced paramagnetic defects in calcified tissues like tooth enamel are indicators of irradiation dose. Hydroxyapatite (HA), the principal constituent in these materials, incorporates a variety of anions (CO32, F, Cl, SiO44 ) and
A Kulkarni, A N. Goland, H Herman, Andrew J. Allen, T A. Dobbins, F DeCarlo, J Ilavsky, S Fang, P Lawton
The ongoing quest to increase gas turbine efficiency and performance (increased thrust) provides a driving force for materials development. While improved engine and usage of novel materials provide solutions for increased engine operating temperatures
C A. King, H Pois, S Zangooie, R M. Young, Joseph Woicik, J A. Gupta
We report the construction and testing of a model for the measurement of graded SiGe bipolar transistor structures after epitaxial growth. Using a commercially available system with spectroscopic ellipsometry as well as other optical measurement
J A. Gupta, Joseph Woicik, S P. Watkins, K E. Miyano, J G. Pellegrino, E D. Crozier
X-ray standing wave and x-ray diffraction meaurements were used to determine the structure of nominal 1 monolayer and monolayer InAs films buried in GaAs(001). The films were grown by atomic layer epitaxy using trimethylgallium, tertiarybutylarsine and
In artifical joint systems, wear particles generated during the life of the replacement have been associated with Osteolysis and prosthetic loosening. The morphology of the wear particles varies according to different articulating geometry, material pairs
C H. Hsueh, P Becher, Lin-Sien H. Lum, Stephen A. Langer, W Carter
Both analytical modeling and numerical simulations were performed to analyze the stress transfer in platelet-reinforced composites in a two-dimensional sense. In the two-dimensional model, an embedded elongate plate bonded to a matrix along its length
V Vaithyanathan, J Lettieri, W Tian, A Kochhar, H Ma, A Sharan, A Vasudevarao, J. A. Aust, Y Li, Long-Qing Chen, P Zschack, Joseph Woicik
c-axis oriented epitaxial films of the ferroelectric BaTiO3 have been grown on (001) Si by reactive molecular-beam epitaxy (MBE). The orientation relationship between the film and substrate is (001) BaTiO3 // (001) Si and [100] BaTiO3 // [110] Si. The
I E. Grey, Robert S. Roth, W G. Mumme, J Planes, Leonid A. Bendersky, C Li, J Chenavas
Two new calcium tantalate polytypes have been prepared in the system Ca2Ta2O7-Ca2Nb2O7. Their structures have been determined and refined using single crystal X-ray diffraction data and powder neutron diffraction data, and their dielectric properties have
Patrick S. Lysaght, Joseph Woicik, Daniel A. Fischer, Gennadi Bersuker, Joel Barnett, Brendan Foran, Hsing-Huang Tseng, Raj Jammy
Nitrogen incorporation in HfO2/SiO2 films utilized as high-k gate dielectric layers in advanced metal-oxide field-effect transistors (MOSFETs) has been investigated. Thin HfO2 blanket films deposited by atomic layer deposition on either SiO2 or NH3 treated
M T. Ahrens, E B. Stokes, Albert Davydov, Peter K. Schenck, Abhishek Motayed, T R. Harris, S T. Morton
Although the efficiency of the Gallium Nitride (GaN) Light Emitting-Diode (LED) has improved in the past decade, a great opportunity for further efficiency improvement lies in the optimization of the Nickel-Gold composition of the p-type GaN metal contacts
I P. Raevski, S A. Prosandeev, U Waghmare, V V. Eremkin, V G. Smotrakov, V A. Shuvaeva
Experimental data obtained for PBFe 1/2Ta 1/20 3 (PFT) and NaNbO 3:Gd (NaNbGd) single crystals show a diffused dielectric permittivity peak that is inherent to relaxor ferroelectrics. However some deviations from the normal relaxor properties were also
A 3D finite element model is constructed to simulate the local impact and its aftermath.For a given design of the disk structure with known elastic/plastic and damage properties as well as the slider s design with its surface texture, the model predicts
Through detection of valence photoelectrons, the technique of x-ray standing waves directly measured the charge asymmetry of the GaAs valence band. Using the back-reflection geometry for the (111) and (111) diffraction planes, we determine from the