Title

Epitaxial crystals of Bi2Pt2O7 pyrochlore through the transformation of δ -Bi2O3 fluorite

Document Type

Article

Publication Date

3-1-2015

Abstract

Bi Pt O pyrochlore is thought to be one of the most promising oxide catalysts for application in fuel cell technology. Unfortunately, direct film growth of Bi Pt O has not yet been achieved, owing to the difficulty of oxidizing platinum metal in the precursor material to Pt . In this work, in order to induce oxidation of the platinum, we annealed pulsed laser deposited films consisting of epitaxial δ-Bi O 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 Bi Pt O . 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-Bi O and Bi Pt O structures appears to facilitate the pyrochlore formation. These results provide the only route to date for the formation of epitaxial Bi Pt O . 2 2 7 2 2 7 2 3 2 2 7 2 3 2 2 7 2 2 7 4+

Publication Name

APL Materials

Volume Number

3

Issue Number

3

DOI

10.1063/1.4908103

Article

036105

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