Fe microenvironments in heat treated rare-earth exchanged montmorillonites

E. Kuzmann, Eszter M. Kovács, Z. Homonnay, Szabolcs Csákvári, Z. Klencsár, Peter Kónya, N. Nagy, Jozsef Kónya

Research output: Contribution to journalArticle

Abstract

The rare-earth bentonites were prepared from Ca-bentonite by suspending Ca-bentonite in rare-earth (Ce, La, Y) perchlorate solution. 57Fe Mössbauer spectra of rare earth montmorillonites before heat treatments showed a doublet envelop at room temperature, reflecting dominantly Fe3+ assigned to (cis) octahedral site in the montmorillonite. At the same time, the 80 K spectra of these rare-earth exchanged montmorillonites revealed an additional magnetically split component, too, associated with iron atoms intercalated in the interlayer space. In the case of heat treated samples (250 °C, 360 °C and 500 °C for 4 h), a new doublet component associated with Fe3+ at trans octahedral site, appeared in both the 295 K and 80 K Mössbauer spectra. Powder X-ray diffractometry (XRD) measurements of the heat treated rare earth montmorillonites revealed that a gradual mineral phase transformation of montmorillonite to muscovite occurred upon the applied heat treatments, being consistent with the completing electron magnetic resonance (EMR) and Mössbauer spectroscopy (MS) results.

Original languageEnglish
Article number87
JournalHyperfine Interactions
Volume240
Issue number1
DOIs
Publication statusPublished - Dec 1 2019

Fingerprint

Bentonite
Rare earths
rare earth elements
heat
bentonite
montmorillonite
heat treatment
Electron resonance
Heat treatment
muscovite
Magnetic resonance
perchlorates
Powders
X ray diffraction analysis
Minerals
phase transformations
magnetic resonance
interlayers
Iron
Phase transitions

Keywords

  • Fe Mössbauer spectroscopy
  • Electron magnetic resonance
  • Interlayer Fe
  • Phase transition
  • Rare earth-montmorillonite

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Fe microenvironments in heat treated rare-earth exchanged montmorillonites. / Kuzmann, E.; Kovács, Eszter M.; Homonnay, Z.; Csákvári, Szabolcs; Klencsár, Z.; Kónya, Peter; Nagy, N.; Kónya, Jozsef.

In: Hyperfine Interactions, Vol. 240, No. 1, 87, 01.12.2019.

Research output: Contribution to journalArticle

Kuzmann, E. ; Kovács, Eszter M. ; Homonnay, Z. ; Csákvári, Szabolcs ; Klencsár, Z. ; Kónya, Peter ; Nagy, N. ; Kónya, Jozsef. / Fe microenvironments in heat treated rare-earth exchanged montmorillonites. In: Hyperfine Interactions. 2019 ; Vol. 240, No. 1.
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