EPR of the thermally produced CrO3- 4 in CrO2- 4-doped (NH4)3H(SeO4)2 crystals

Ching Jiun Wu, Jiang Tsu Yu

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    4 Citations (Scopus)

    Abstract

    Two spin 1 2 paramagnetic species (species I and species II) are detected by electron paramagnetic resonance (EPR) in CrO2- 4-doped (NH4)3H(SeO4)2 single crystals, after the host crystals had been heated to temperatures well below their decomposition temperature. When heat treated at lower temperatures ({reversed tilde equals}90°C), only one species (species I) was detected by EPR. The EPR spectrum of this species was identical to that of the CrO3- 4 species produced by γ-irradiation of the sample crystals. By comparing the thermal treatment behaviors of the CrO2- 4-doped Rb3H(SeO4)2 and Cs3H(SeO4)2 crystals, it was established that the electronic defect acquired by the CrO2- 4 to form the thermally produced CrO3- 4 (I) originates from the NH+ 4 group. It is difficult to determine with certainty from the g-values alone the identity of species II. This species could be a CrO- 3 or a Cr5+ ion.

    Original languageEnglish
    Pages (from-to)549-555
    Number of pages7
    JournalJournal of Solid State Chemistry
    Volume93
    Issue number2
    DOIs
    Publication statusPublished - 1991 Aug

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Inorganic Chemistry
    • Materials Chemistry

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