Ultrasonically-enhanced preparation, characterization of CaFe-layered double hydroxides with various interlayer halide, azide and oxo anions (CO3 2−, NO3 , ClO4 )

Research output: Contribution to journalArticle


An ultrasonically-enhanced mechanochemical method was developed to synthesize CaFe-layered double hydroxides (LDHs) with various interlayer anions (CO3 2−, NO3 , ClO4 , N3 , F, Cl, Br and I). The duration of pre-milling and ultrasonic irradiation and the variation of synthesis temperature in the wet chemical step were investigated to obtain the optimal parameters of preparation. The main method to characterize the products was X-ray diffractometry, but infrared and synchrotron-based X-ray absorption spectroscopies as well as thermogravimetric measurements were also used to learn about fine structural details. The synthesis method afforded successful intercalation of the anions, among others the azide anion, a rarely used counter ion providing a system, which enables safe handling the otherwise highly reactive anion. The X-ray absorption spectroscopic measurements revealed that the quality of the interlayered anions could modulate the spatial arrangement of the calcium ions around the iron(III) ions, but only in the second coordination sphere.


  • Márton Szabados
  • Gábor Varga
  • Zoltán Kónya
  • Ákos Kukovecz
  • Stefan Carlson
  • Pál Sipos
  • István Pálinkó
External organisations
  • University of Szeged
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Materials Chemistry


  • CaFe-LDH, Interlayered halide, azide, oxo anions, Mechanochemical treatment, Ultrasonic irradiation, XAS−TG−IR
Original languageEnglish
Pages (from-to)853-860
Number of pages8
JournalUltrasonics Sonochemistry
Publication statusPublished - 2018 Jan 1
Publication categoryResearch