Dissociation of the hyperchromate ion into the chromic ion in crystals: An electron spin resonance study

Shen Yuan Chou, Jiang-Tsu Yu

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By heating LiCsSO4 crystals which have been doped with ammonium chromate and γ-irradiated, Cr3+ species with large zero-field splittings were detected by electron spin resonance (ESR). The Cr3+ species result from an ammonium-hydrogen-assisted dissociation of the CrO4 3- and CrO3 - species produced by irradiation. The same oxygen-stripping effect was observed by ESR in γ-irradiated LiNH4SO4 and (NH4)2SO4 crystals doped with CrO4 2-. Dissociation of CrO4 2- itself into Cr3- was observed by ESR in CrO4 2--doped ammonium sulfate crystals heated at temperatures well below the dissociation temperature of this compound.

Original languageEnglish
Pages (from-to)993-999
Number of pages7
JournalJournal of Physics and Chemistry of Solids
Issue number8
Publication statusPublished - 1990 Jan 1



  • Dissociation
  • ESR
  • free radical

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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