Thermally induced changes in the oxidation state of cerium(IV): A study of carbonato and chloro complexes

J. Madarász, T. Leskelä, G. Pokol, L. Niinistö

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Cesium hexachlorocerate(IV), Cs2CeCl6 (I) and sodium pentakis(carbonato)cerate(IV), Na6Ce(CO3)5·12H2O (II) have been investigated in air by simultaneous TG/DTA, FTIR and XRD in order to follow the oxidation state of cerium during their thermal treatment. The thermal decomposition of the hexachloro compound (I) is accompanied by a double change in the oxidation state of cerium. First, in an inner reduction-oxidation reaction, chlorine is evolved and a Cs2CeCl5 phase is obtained. The immediately starting oxidation of this Ce(III) species caused various phase transitions in the CeCl3-CsCl system formed. The presence of Cs3CeCl6 above 400°C can also be assumed and finally this phase also oxidizes into CeO2 with the formation of CsCl as by-product. In the case of the pentacarbonato complex (II), no Ce(III) species were detected. The final products of its decomposition were CeO2 and Na2CO3.

Original languageEnglish
Pages (from-to)1347-1355
Number of pages9
JournalJournal of thermal analysis
Volume49
Issue number3
Publication statusPublished - Dec 1 1997

Keywords

  • Carbonato complex
  • Cerium
  • Chloro complex
  • Oxidation-reduction

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Engineering(all)

Fingerprint Dive into the research topics of 'Thermally induced changes in the oxidation state of cerium(IV): A study of carbonato and chloro complexes'. Together they form a unique fingerprint.

  • Cite this