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Title: Epitaxial crystals of Bi₂Pt₂O₇ pyrochlore through the transformation of δ–Bi₂O₃ fluorite

Abstract

Bi₂Pt₂O₇ pyrochlore is thought to be one of the most promising oxide catalysts for application in fuel cell technology. Unfortunately, direct film growth of Bi₂Pt₂O₇ has not yet been achieved, owing to the difficulty of oxidizing platinum metal in the precursor material to Pt⁴⁺. In this work, in order to induce oxidation of the platinum, we annealed pulsed laser deposited films consisting of epitaxial δ–Bi₂O₃ and co-deposited, comparatively disordered platinum. We present synchrotron x-ray diffraction results that show the nonuniform annealed films contain the first epitaxial crystals of Bi₂Pt₂O₇. We also visualized the pyrochlore structure by scanning transmission electron microscopy, and observed ordered cation vacancies in the epitaxial crystals formed in a bismuth-rich film but not in those formed in a platinum-rich film. The similarity between the δ–Bi₂O₃ and Bi₂Pt₂O₇ structures appears to facilitate the pyrochlore formation. These results provide the only route to date for the formation of epitaxial Bi₂Pt₂O₇.

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [1];  [2]; ORCiD logo [1];  [1]
  1. Cornell Univ., Ithaca, NY (United States)
  2. Ithaca College, Ithaca, NY (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Energy Materials Center at Cornell (EMC2); Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1203554
Grant/Contract Number:  
SC0001086
Resource Type:
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 3; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 30 DIRECT ENERGY CONVERSION

Citation Formats

Gutiérrez–Llorente, Araceli, Joress, Howie, Woll, Arthur, Holtz, Megan E., Ward, Matthew J., Sullivan, Matthew C., Muller, David A., and Brock, Joel D. Epitaxial crystals of Bi₂Pt₂O₇ pyrochlore through the transformation of δ–Bi₂O₃ fluorite. United States: N. p., 2015. Web. doi:10.1063/1.4908103.
Gutiérrez–Llorente, Araceli, Joress, Howie, Woll, Arthur, Holtz, Megan E., Ward, Matthew J., Sullivan, Matthew C., Muller, David A., & Brock, Joel D. Epitaxial crystals of Bi₂Pt₂O₇ pyrochlore through the transformation of δ–Bi₂O₃ fluorite. United States. https://doi.org/10.1063/1.4908103
Gutiérrez–Llorente, Araceli, Joress, Howie, Woll, Arthur, Holtz, Megan E., Ward, Matthew J., Sullivan, Matthew C., Muller, David A., and Brock, Joel D. Sun . "Epitaxial crystals of Bi₂Pt₂O₇ pyrochlore through the transformation of δ–Bi₂O₃ fluorite". United States. https://doi.org/10.1063/1.4908103. https://www.osti.gov/servlets/purl/1203554.
@article{osti_1203554,
title = {Epitaxial crystals of Bi₂Pt₂O₇ pyrochlore through the transformation of δ–Bi₂O₃ fluorite},
author = {Gutiérrez–Llorente, Araceli and Joress, Howie and Woll, Arthur and Holtz, Megan E. and Ward, Matthew J. and Sullivan, Matthew C. and Muller, David A. and Brock, Joel D.},
abstractNote = {Bi₂Pt₂O₇ pyrochlore is thought to be one of the most promising oxide catalysts for application in fuel cell technology. Unfortunately, direct film growth of Bi₂Pt₂O₇ has not yet been achieved, owing to the difficulty of oxidizing platinum metal in the precursor material to Pt⁴⁺. In this work, in order to induce oxidation of the platinum, we annealed pulsed laser deposited films consisting of epitaxial δ–Bi₂O₃ and co-deposited, comparatively disordered platinum. We present synchrotron x-ray diffraction results that show the nonuniform annealed films contain the first epitaxial crystals of Bi₂Pt₂O₇. We also visualized the pyrochlore structure by scanning transmission electron microscopy, and observed ordered cation vacancies in the epitaxial crystals formed in a bismuth-rich film but not in those formed in a platinum-rich film. The similarity between the δ–Bi₂O₃ and Bi₂Pt₂O₇ structures appears to facilitate the pyrochlore formation. These results provide the only route to date for the formation of epitaxial Bi₂Pt₂O₇.},
doi = {10.1063/1.4908103},
journal = {APL Materials},
number = 3,
volume = 3,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}

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