The structure and stability of CaFe layered double hydroxides with various Ca: Fe ratios studied by Mössbauer spectroscopy, X-ray diffractometry and microscopic analysis

M. Sipiczki, E. Kuzmann, Z. Homonnay, J. Megyeri, I. Pálinkó, P. Sipos

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The effects of the Ca(II)/Fe(III) ratios on the structure and Fe microenvironments have been studied in layered double hydroxides comprising of Ca(II) and Fe(III) (CaFe-LDH) prepared by the co-precipitation method. The Ca(II)/Fe(III) ratios were varied systematically from 2 to 6 and for characterisation 57Fe Mössbauer spectroscopy, powder X-ray diffractometry and scanning electron microscopy were applied. XRD patterns of the samples at all Ca(II)/Fe(III) ratios exhibited reflections corresponding to CaFe-LDH and 57Fe Mössbauer measurements revealed that Fe(III) was in a high-spin, somewhat disordered octahedral environment. Above the Ca(II)/Fe(III) ratio of 2 the reflections of Ca(OH)2 also appeared. This phase was found to stabilise the LDH phase, while the phase-pure LDH decomposed on ageing.

Original languageEnglish
Pages (from-to)116-120
Number of pages5
JournalJournal of Molecular Structure
Volume1044
DOIs
Publication statusPublished - Jul 24 2013

Fingerprint

Hydroxides
X ray diffraction analysis
Coprecipitation
Powders
Aging of materials
Spectroscopy
Scanning electron microscopy

Keywords

  • Fe Mössbauer spectroscopy
  • CaFe-L(ayered)D(ouble)H(ydroxide)
  • Characterisation by scanning electron microscopy and XRD
  • Stabilities of LDH structures
  • Varying Ca:Fe ratios

ASJC Scopus subject areas

  • Spectroscopy
  • Analytical Chemistry
  • Inorganic Chemistry
  • Organic Chemistry

Cite this

@article{d0915a1f9bc848758027a8db355417d1,
title = "The structure and stability of CaFe layered double hydroxides with various Ca: Fe ratios studied by M{\"o}ssbauer spectroscopy, X-ray diffractometry and microscopic analysis",
abstract = "The effects of the Ca(II)/Fe(III) ratios on the structure and Fe microenvironments have been studied in layered double hydroxides comprising of Ca(II) and Fe(III) (CaFe-LDH) prepared by the co-precipitation method. The Ca(II)/Fe(III) ratios were varied systematically from 2 to 6 and for characterisation 57Fe M{\"o}ssbauer spectroscopy, powder X-ray diffractometry and scanning electron microscopy were applied. XRD patterns of the samples at all Ca(II)/Fe(III) ratios exhibited reflections corresponding to CaFe-LDH and 57Fe M{\"o}ssbauer measurements revealed that Fe(III) was in a high-spin, somewhat disordered octahedral environment. Above the Ca(II)/Fe(III) ratio of 2 the reflections of Ca(OH)2 also appeared. This phase was found to stabilise the LDH phase, while the phase-pure LDH decomposed on ageing.",
keywords = "Fe M{\"o}ssbauer spectroscopy, CaFe-L(ayered)D(ouble)H(ydroxide), Characterisation by scanning electron microscopy and XRD, Stabilities of LDH structures, Varying Ca:Fe ratios",
author = "M. Sipiczki and E. Kuzmann and Z. Homonnay and J. Megyeri and I. P{\'a}link{\'o} and P. Sipos",
year = "2013",
month = "7",
day = "24",
doi = "10.1016/j.molstruc.2012.10.060",
language = "English",
volume = "1044",
pages = "116--120",
journal = "Journal of Molecular Structure",
issn = "0022-2860",
publisher = "Elsevier",

}

TY - JOUR

T1 - The structure and stability of CaFe layered double hydroxides with various Ca

T2 - Fe ratios studied by Mössbauer spectroscopy, X-ray diffractometry and microscopic analysis

AU - Sipiczki, M.

AU - Kuzmann, E.

AU - Homonnay, Z.

AU - Megyeri, J.

AU - Pálinkó, I.

AU - Sipos, P.

PY - 2013/7/24

Y1 - 2013/7/24

N2 - The effects of the Ca(II)/Fe(III) ratios on the structure and Fe microenvironments have been studied in layered double hydroxides comprising of Ca(II) and Fe(III) (CaFe-LDH) prepared by the co-precipitation method. The Ca(II)/Fe(III) ratios were varied systematically from 2 to 6 and for characterisation 57Fe Mössbauer spectroscopy, powder X-ray diffractometry and scanning electron microscopy were applied. XRD patterns of the samples at all Ca(II)/Fe(III) ratios exhibited reflections corresponding to CaFe-LDH and 57Fe Mössbauer measurements revealed that Fe(III) was in a high-spin, somewhat disordered octahedral environment. Above the Ca(II)/Fe(III) ratio of 2 the reflections of Ca(OH)2 also appeared. This phase was found to stabilise the LDH phase, while the phase-pure LDH decomposed on ageing.

AB - The effects of the Ca(II)/Fe(III) ratios on the structure and Fe microenvironments have been studied in layered double hydroxides comprising of Ca(II) and Fe(III) (CaFe-LDH) prepared by the co-precipitation method. The Ca(II)/Fe(III) ratios were varied systematically from 2 to 6 and for characterisation 57Fe Mössbauer spectroscopy, powder X-ray diffractometry and scanning electron microscopy were applied. XRD patterns of the samples at all Ca(II)/Fe(III) ratios exhibited reflections corresponding to CaFe-LDH and 57Fe Mössbauer measurements revealed that Fe(III) was in a high-spin, somewhat disordered octahedral environment. Above the Ca(II)/Fe(III) ratio of 2 the reflections of Ca(OH)2 also appeared. This phase was found to stabilise the LDH phase, while the phase-pure LDH decomposed on ageing.

KW - Fe Mössbauer spectroscopy

KW - CaFe-L(ayered)D(ouble)H(ydroxide)

KW - Characterisation by scanning electron microscopy and XRD

KW - Stabilities of LDH structures

KW - Varying Ca:Fe ratios

UR - http://www.scopus.com/inward/record.url?scp=84878289430&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84878289430&partnerID=8YFLogxK

U2 - 10.1016/j.molstruc.2012.10.060

DO - 10.1016/j.molstruc.2012.10.060

M3 - Article

AN - SCOPUS:84878289430

VL - 1044

SP - 116

EP - 120

JO - Journal of Molecular Structure

JF - Journal of Molecular Structure

SN - 0022-2860

ER -