Defects and charge transport near the hematite (0001) surface: An atomistic study of oxygen vacancies

Oliver Warschkow, Donald E. Ellis, Jinha Hwang, Negar Mansourian-Hadavi, Thomas O Mason

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Atomistic calculations were performed on a slab model of the (0001) surface of hematite as well as the bulk structure. In particular, the energetics of oxygen vacancies near the surface was studied. Atomistic modeling was used to establish the defect energies in the bulk versus distance from the surface. Transition state calculations were performed to compute barriers for several pathways of migration of oxygen vacancies in the bulk and at varying depths relative to the surface. We find energy barriers of several transitions considerably lowered closer to the surface. Considerations of literature data for electrical conductivity and Seebeck coefficient on bulk versus thin-film hematite suggest high populations of point defects near surfaces, in agreement with our predictions.

Original languageEnglish
Pages (from-to)213-220
Number of pages8
JournalJournal of the American Ceramic Society
Volume85
Issue number1
Publication statusPublished - Jan 2002

ASJC Scopus subject areas

  • Ceramics and Composites

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