skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on October 30, 2020

Title: Evaluating the accuracy of common γ-Al 2O 3 structure models by selected area electron diffraction from high-quality crystalline γ-Al 2O 3

Abstract

Single crystal and textured polycrystalline γ-Al 2O 3 thin films were synthesized by oxidation of NiAl(110) in air at 850 °C for 1 and 2 hours, respectively, and used to evaluate the accuracy of two spinel-based and two nonspinel models by comparison of selected-area electron diffraction (SAED). The lattice interplanar distances derived from the polycrystalline SAED pattern most closely matched the cubic spinel γ-Al 2O 3 model. The single-crystal SAED spot pattern reflected symmetry consistent with both the cubic spinel and tetragonal nonspinel models, yet, the Al cation distribution better matched the cubic spinel model based on the relative intensities of diffraction spots. Our work indicates that the traditional cubic spinel model is a more accurate model of γ-Al 2O 3 than the other models considered. Furthermore, the spinel-based monoclinic model is more accurate than the monoclinic nonspinel model. The understanding of the relative accuracy of the different models is key for simulating γ-Al 2O 3 containing systems and is of general interest for the metal oxide and ceramic communities.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [1];  [1]
  1. Univ. of Pittsburgh, PA (United States)
  2. Univ. of Pittsburgh, PA (United States); E.A. Fischione Instruments Inc., Export, PA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1581957
Report Number(s):
BNL-213512-2020-JAAM
Journal ID: ISSN 1359-6454
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 182; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Diffraction; Electron diffraction pattern; Crystalline oxides; Transmission electron microscopy (TEM); γ-Al2O3

Citation Formats

Ayoola, Henry O., House, Stephen D., Bonifacio, Cecile S., Kisslinger, Kim, Saidi, Wissam A., and Yang, Judith C. Evaluating the accuracy of common γ-Al2O3 structure models by selected area electron diffraction from high-quality crystalline γ-Al2O3. United States: N. p., 2019. Web. doi:10.1016/j.actamat.2019.10.027.
Ayoola, Henry O., House, Stephen D., Bonifacio, Cecile S., Kisslinger, Kim, Saidi, Wissam A., & Yang, Judith C. Evaluating the accuracy of common γ-Al2O3 structure models by selected area electron diffraction from high-quality crystalline γ-Al2O3. United States. doi:10.1016/j.actamat.2019.10.027.
Ayoola, Henry O., House, Stephen D., Bonifacio, Cecile S., Kisslinger, Kim, Saidi, Wissam A., and Yang, Judith C. Wed . "Evaluating the accuracy of common γ-Al2O3 structure models by selected area electron diffraction from high-quality crystalline γ-Al2O3". United States. doi:10.1016/j.actamat.2019.10.027.
@article{osti_1581957,
title = {Evaluating the accuracy of common γ-Al2O3 structure models by selected area electron diffraction from high-quality crystalline γ-Al2O3},
author = {Ayoola, Henry O. and House, Stephen D. and Bonifacio, Cecile S. and Kisslinger, Kim and Saidi, Wissam A. and Yang, Judith C.},
abstractNote = {Single crystal and textured polycrystalline γ-Al2O3 thin films were synthesized by oxidation of NiAl(110) in air at 850 °C for 1 and 2 hours, respectively, and used to evaluate the accuracy of two spinel-based and two nonspinel models by comparison of selected-area electron diffraction (SAED). The lattice interplanar distances derived from the polycrystalline SAED pattern most closely matched the cubic spinel γ-Al2O3 model. The single-crystal SAED spot pattern reflected symmetry consistent with both the cubic spinel and tetragonal nonspinel models, yet, the Al cation distribution better matched the cubic spinel model based on the relative intensities of diffraction spots. Our work indicates that the traditional cubic spinel model is a more accurate model of γ-Al2O3 than the other models considered. Furthermore, the spinel-based monoclinic model is more accurate than the monoclinic nonspinel model. The understanding of the relative accuracy of the different models is key for simulating γ-Al2O3 containing systems and is of general interest for the metal oxide and ceramic communities.},
doi = {10.1016/j.actamat.2019.10.027},
journal = {Acta Materialia},
number = C,
volume = 182,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 30, 2020
Publisher's Version of Record

Save / Share: