A Raman spectroscopy study of cerium oxide in a cerium-5 wt.% lanthanum alloy

D. W. Wheeler, I. Khan

Research output: Journal PublicationArticlepeer-review

44 Citations (Scopus)

Abstract

This paper describes a study of a cerium-5 wt.% lanthanum (Ce-5 wt.% La) alloy using Raman spectroscopy and X-ray diffraction (XRD). Examination of the alloy microstructure by optical microscopy and Raman spectroscopy revealed the presence of inclusions which were identified as cerium oxide (CeO2). The study also highlighted the need to avoid excessive laser power during acquisition of the Raman spectra as this appeared to cause the oxidation of the region being analysed where previously no cerium oxide peak had been detected. The propensity of cerium to oxidise in air results in the formation of a CeO2 layer on the surface of the alloy. Raman spectroscopy of the oxide layer formed on the alloy after exposure to air for 21 days found that the Raman peak denoting cerium oxide was seen at between 5 and 7 cm-1 lower than the value for CeO2 (465 cm-1). This is attributed to a combination of a sub-stoichiometric oxide layer and the presence of La in the alloy. Crown

Original languageEnglish
Pages (from-to)200-206
Number of pages7
JournalVibrational Spectroscopy
Volume70
DOIs
Publication statusPublished - Jan 2014
Externally publishedYes

Keywords

  • Cerium
  • Cerium oxide
  • Inclusions
  • Oxidation
  • Raman spectroscopy

ASJC Scopus subject areas

  • Spectroscopy

Fingerprint

Dive into the research topics of 'A Raman spectroscopy study of cerium oxide in a cerium-5 wt.% lanthanum alloy'. Together they form a unique fingerprint.

Cite this