Henrietta E. Cathey
University of Utah
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Henrietta E. Cathey.
Materials | 2018
Mahboobeh Shahbazi; Henrietta E. Cathey; Ian D.R. Mackinnon
We demonstrate synthesis of the ternary intermetallic MgNi3B2 using autogenous pressure from the reaction of NaBH4 with Mg and Ni metal powder. The decomposition of NaBH4 to H2 and B2H6 commences at low temperatures in the presence of Mg and/or Ni and promotes formation of Ni-borides and MgNi3B2 with the increase in temperature. MgNi3B2 aggregates with Ni-boride cores are formed when the reaction temperature is >670 °C and autogenous pressure is >1.7 MPa. Morphologies and microstructures suggest that solid–gas and liquid–gas reactions are dominant mechanisms and that Ni-borides form at a lower temperature than MgNi3B2. Magnetic measurements of the core-shell MgNi3B2 aggregates are consistent with ferromagnetic behaviour in contrast to stoichiometric MgNi3B2 which is diamagnetic at room temperature.
IOP Conference Series: Materials Science and Engineering | 2016
John H. Fournelle; Henrietta E. Cathey; Philippe T. Pinard; Silvia Richter
Field emission (FE) electron gun sources provide new capabilities for high lateral resolution EPMA. The determination of analytical lateral resolution is not as straightforward as that for electron microscopy imaging. Results from two sets of experiments to determine the actual lateral resolution for accurate EPMA are presented for Kα X-ray lines of Si and Al and Lα of Fe at 5 and 7 keV in a silicate glass. These results are compared to theoretical predictions and Monte Carlo simulations of analytical lateral resolution. The experiments suggest little is gained in lateral resolution by dropping from 7 to 5 keV in EPMA of this silicate glass.
Materials | 2018
Mahboobeh Shahbazi; Henrietta E. Cathey; Natalia Danilova; Ian D.R. Mackinnon
Crystalline Ni2B, Ni3B, and Ni4B3 are synthesized by a single-step method using autogenous pressure from the reaction of NaBH4 and Ni precursors. The effect of reaction temperature, pressure, time, and starting materials on the composition of synthesized products, particle morphologies, and magnetic properties is demonstrated. High yields of Ni2B (>98%) are achieved at 2.3–3.4 MPa and ~670 °C over five hours. Crystalline Ni3B or Ni4B3 form in conjunction with Ni2B at higher temperature or higher autogenous pressure in proportions influenced by the ratios of initial reactants. For the same starting ratios of reactants, a longer reaction time or higher pressure shifts equilibria to lower yields of Ni2B. Using this approach, yields of ~88% Ni4B3 (single phase orthorhombic) and ~72% Ni3B are obtained for conditions 1.9 MPa < Pmax < 4.9 MPa and 670 °C < Tmax < 725 °C. Gas-solid reaction is the dominant transformation mechanism that results in formation of Ni2B at lower temperatures than conventional solid-state methods.
Journal of Petrology | 2004
Henrietta E. Cathey; Barbara P. Nash
Journal of Petrology | 2012
Renat R. Almeev; Torsten Bolte; Barbara P. Nash; Francois Holtz; Martin Erdmann; Henrietta E. Cathey
School of Earth, Environmental & Biological Sciences; Faculty of Science and Technology; Institute for Future Environments | 2011
Henrietta E. Cathey; Barbara P. Nash; John W. Valley; Noriko T. Kita; Charlotte M. Allen; Ian H. Campbell
Journal of Volcanology and Geothermal Research | 2009
Lisa A. Morgan; Henrietta E. Cathey; Kenneth L. Pierce
School of Earth, Environmental & Biological Sciences; Faculty of Science and Technology; Institute for Future Environments; Science & Engineering Faculty | 2011
Henrietta E. Cathey; Barbara P. Nash; A. N. Seligman; John W. Valley; Noriko T. Kita; Charlotte M. Allen; Ian H. Campbell; J. A. Vazquez; J. L. Wooden
School of Earth, Environmental & Biological Sciences; Institute for Future Environments; Science & Engineering Faculty | 2018
Mahboobeh Shahbazi; Henrietta E. Cathey; Natalia Danilova; Ian D.R. Mackinnon
Institute for Future Environments; Science & Engineering Faculty | 2018
Mahboobeh Shahbazi; Henrietta E. Cathey; Ian D.R. Mackinnon