Grain core and grain boundary electrical/dielectric properties of yttria-doped tetragonal zirconia polycrystal (TZP) nanoceramics

Nicola H. Perry, Thomas O. Mason

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    33 Citations (Scopus)

    Abstract

    Bulk samples of nanocrystalline tetragonal zirconia polycrystal (TZP), with 3 mol.% Y2O3, were fabricated over a range of average grain sizes (16-70 nm) by partial sintering. The samples were measured using AC-impedance spectroscopy over a range of temperatures, and porosity-corrected electrical results were interpreted in terms of microstructural models. Whereas the conventional brick layer model (BLM) significantly overestimated the specific grain boundary conductivity at the nanoscale, our recently developed nano-Grain Composite Model (n-GCM) allowed accurate determination of local grain boundary and grain core conductivities, grain boundary dielectric constants, and electrical grain boundary widths. Grain core effective dielectric constants were also separately measured on microcrystalline samples over a range of temperatures for use in the n-GCM analysis. It was found that TZP exhibits an enhanced local grain boundary conductivity at the nanoscale, but the enhancement is insufficient to improve the total conductivity. Rather, total conductivity decreased with decreasing grain size. Results were compared with those for nanocrystalline yttria-stabilized zirconia (8 mol.% Y2O3, YSZ).

    Original languageEnglish
    Pages (from-to)276-284
    Number of pages9
    JournalSolid State Ionics
    Volume181
    Issue number5-7
    DOIs
    Publication statusPublished - Mar 11 2010

    All Science Journal Classification (ASJC) codes

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

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