Detection of dimers by 19F NMR in CdF2 doped with ErF3 and YbF3

M. R. Mustafa, W. E. Jones, B. R. McGarvey, M. Greenblatt, E. Banks

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

The 19F NMR of single crystals of CdF2 containing large concentrations of ErF3 or YbF3 has been studied at 30 and 46.5 MHz from 190° to 373°K. In addition to the main resonance, two types of weaker resonances were detected: one type displaying symmetry about the [111] axis and the other displaying symmetry about the [100] axis. The 111 lines are attributed to the lattice fluorides adjacent to one rare earth ion while the 100 lines are attributed to the interstitial fluoride. It is shown that the anisotropy of the interstitial fluoride resonance can only be explained by the presence of two rare earth ions at 90° angles and therefore the bulk of rare earth ions and interstitial fluorides must be present as (RE 3+-Fi-)2 dimers. The anisotropic portion of the NMR shifts is shown to be entirely due to the dipolar contribution of spin residing on the rare earth ion. Further it is shown that the isotropic shift is of opposite sign to that predicted by the equation currently used to explain contact shift of lanthanide ions.

Original languageEnglish (US)
Pages (from-to)2700-2706
Number of pages7
JournalThe Journal of Chemical Physics
Volume62
Issue number7
DOIs
StatePublished - Jan 1 1975

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Detection of dimers by <sup>19</sup>F NMR in CdF<sub>2</sub> doped with ErF<sub>3</sub> and YbF<sub>3</sub>'. Together they form a unique fingerprint.

  • Cite this