A systematic study of the oxygen K edge in the cubic and less common monoclinic phases of the rare earth oxides (Ho, Er, Tm, Yb) by electron energy loss spectroscopy

Ashley Harvey, Bing Guo, Ian Kennedy, Subhash Risbud, Valerie Leppert

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Transmission electron microscopy and electron energy loss spectroscopy (EELS) were used to distinguish structural details for the cubic and uncommon monoclinic crystal phases of heavy metal rare earth oxide nanoparticles synthesized by a combustion process. Specifically, we systematically examined the EELS oxygen K edge for Ho, Tm, Er, and Yb sesquioxides in both phases. This work presents, to our knowledge, the first EELS study of the monoclinic phase in these materials and the first systematic comparative study between the monoclinic and cubic phases across a range of rare earth sesquioxides. For both phases, we observed the usual double-peak structure of the oxygen K edge typically seen for oxygen atoms tetrahedrally surrounded by metal atoms, but we found the details of the energy loss near-edge structure to differ substantially between the two phases. Our results indicate a greater peak separation for the cubic than for the monoclinic phase. Furthermore, a trend of increasing peak separation with increasing atomic number was also noted for both phases in the series of rare earth oxide nanoparticles. Our results show that the fine structure in EELS can be utilized to determine differences on the nanoscale between the common cubic structure and the less common monoclinic structure.

Original languageEnglish
Pages (from-to)2181-2189
Number of pages9
JournalJournal of Physics Condensed Matter
Volume18
Issue number7
DOIs
Publication statusPublished - 22 Feb 2006
Externally publishedYes

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Electron Energy-Loss Spectroscopy
Electron energy loss spectroscopy
Oxides
Rare earths
rare earth elements
energy dissipation
electron energy
Oxygen
oxides
oxygen
Nanoparticles
spectroscopy
Atoms
Heavy Metals
Transmission Electron Microscopy
nanoparticles
Heavy metals
Energy dissipation
heavy metals
Metals

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

A systematic study of the oxygen K edge in the cubic and less common monoclinic phases of the rare earth oxides (Ho, Er, Tm, Yb) by electron energy loss spectroscopy. / Harvey, Ashley; Guo, Bing; Kennedy, Ian; Risbud, Subhash; Leppert, Valerie.

In: Journal of Physics Condensed Matter, Vol. 18, No. 7, 22.02.2006, p. 2181-2189.

Research output: Contribution to journalArticle

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