Cr3+ chemical diffusivity in aliovalent doped aluminas

Lin Feng, Shen J Dillon

Research output: Contribution to journalArticlepeer-review

Abstract

Average lattice diffusivities of Cr3+ in undoped, MgO-doped, and SiO2-doped Al2O3 have been measured between 1100 and 1300 °C using scanning transmission electron microscopy based x-ray energy dispersive spectroscopy. It has been demonstrated that both MgO and SiO2 dopants have negligible effect on lattice Cr3+ chemical diffusion. The experimentally determined Arrhenius equations for undoped, MgO-doped, and SiO2-doped samples are Dundoped=1.9×10−10exp(−[formula presented])m2/s, DMgO=2.0×10−13exp(−[formula presented])m2/s, and DSiO2 =6.2×10−11exp(−[formula presented])m2/s, respectively. The weak dopant effect is discussed in the context of the contributions from both extrinsic point defect concentrations and their cluster binding energies.

Original languageEnglish (US)
Pages (from-to)4025-4032
Number of pages8
JournalJournal of the European Ceramic Society
Volume37
Issue number13
DOIs
StatePublished - Oct 2017

Keywords

  • Alumina
  • Diffusion
  • Dopant effect

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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