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IJPAP Vol.45(10) [October 2007] >
| Title: | Application of Mössbauer spectroscopy in thermal decomposition studies of some metal ferricarboxylates |
| Authors: | Randhawa, B S
Gandotra, K |
| Keywords: | Mössbauer spectroscopy
X-ray diffraction
Ferrites
Metal ferricarboxylates |
| Issue Date: | Oct-2007 |
| Publisher: | CSIR |
| IPC Code: | G01J3/28 |
| Abstract: | The thermal decomposition of magnesium and calcium hexa(formato)ferrates(III), M₃[Fe(HCOO)₆]₂×H₂O, has been carried out in flowing air atmosphere from ambient temperature to 700ºC. Various physico-chemical techniques i.e. TG, DTG, DSC, XRD, IR, Mössbauer spectroscopy etc. have been employed to characterize the intermediates/end products. After dehydration, the anhydrous complexes undergo decomposition to yield an iron(II) oxalate intermediate in the temperature range 100-130ºC. A subsequent oxidative decomposition of iron(II) species leads to the formation of ⍺-Fe₂O₃ and respective alkaline earth metal carbonate/oxide in successive stages. Finally, nanosized ferrites of the stoichiometry, MgFe₂O₄ and Ca₂Fe₂O₅ have been obtained as a result of solid-state reaction between ⍺-Fe₂O₃ and a fraction of MO. The obtention of ferrites at a temperature much lower than possible in conventional ceramic method, is a special feature of the method used. |
| Page(s): | 795-799 |
| ISSN: | 0019-5596 |
| Source: | IJPAP Vol.45(10) [October 2007]
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