Zircon formation from amorphous powder and melt in the silica-rich region of the alumina-silica-zirconia system

Mónica Popa, Masato Kakihana, Masahiro Yoshimura, José M. Calderón-Moreno

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    Chemically homogeneous amorphous powders were prepared by sol-gel method from alkoxide mixtures in the silica-rich region of the alumina-silica-zirconia system. A glass with the same composition was obtained by quenching in water from the melt. The evolution with temperature in the range up to 1625 °C was studied by means of X-ray diffraction, infrared and UV-Raman spectroscopy, scanning electron microscopy and energy-dispersive X-ray analysis. Zircon crystallization and stability at temperatures higher than the liquidus temperature were confirmed in both melt-quenched and gel-glasses. Crystallization of cristobalite from the amorphous gel-glasses was observed above 1200 °C. The crystallization of zircon particles was observed after thermal treatment at 1550 °C. At 1625 °C zircon was the only stable crystalline phase due to the complete melting of the silica-rich matrix. The XRD pattern of the ternary gel treated at 1625 °C shows clearly the disappearance of the cristobalite phase, while at 1550 °C there is already partial melting. These results can help to determine the phase equilibrium in the ternary system.

    Original languageEnglish
    Pages (from-to)5663-5669
    Number of pages7
    JournalJournal of Non-Crystalline Solids
    Volume352
    Issue number52-54
    DOIs
    Publication statusPublished - 2006 Dec 15

    Keywords

    • Crystallization
    • FTIR measurements
    • Optical properties
    • Oxidation reduction
    • Oxide glasses
    • Phases and equilibria
    • Raman spectroscopy
    • Silica
    • Sol-gel, aerogel and solution chemistry
    • Solution chemistry

    ASJC Scopus subject areas

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

    Fingerprint

    Dive into the research topics of 'Zircon formation from amorphous powder and melt in the silica-rich region of the alumina-silica-zirconia system'. Together they form a unique fingerprint.

    Cite this