Title

High Temperature Oxidation Kinetics of Dysprosium

Document Type

Student Presentation

Presentation Date

2015

Faculty Sponsor

Darryl Butt

Abstract

Rare-earth elements are of increasing importance in many critical materials systems. In particular, dysprosium, a heavy rare earth metal, is considered one of the most critical rare earth elements for its use in green energy technology. The oxidation kinetics of dysprosium were assessed in a simulated air atmosphere from 650-900 °C. After oxidation the samples were mounted, sectioned, and characterized using optical microscopy, energy dispersive x-ray spectroscopy (EDS), and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). Oxide thicknesses were used to determine the kinetics of oxidation which followed a linear trend at 650-750 °C and exhibited a parabolic behavior at 800 -900 °C. During an inert marker experiment at 650 °C the marker was present on the cross-section of the outer oxide interface, determining that the oxide growth occurs via oxygen diffusion to the metal-oxide interface. Depending on the temperature, the oxide shows both n and p type semiconducting behavior.

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