The brick layer model revisited: Introducing the nano-grain composite model

Neil J. Kidner, Nicola H. Perry, Thomas O Mason, Edward J. Garboczi

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Brick layer models (BLMs), although applicable at the microscale, are inappropriate for characterizing electroceramics at the nanoscale. A new construct, the nano-grain composite model (n-GCM), has been developed to model/analyze the AC-impedance response of equiaxed polycrystalline electroceramics. The procedure employs a set of equations, based on the Maxwell-Wagner/Hashin-Shtrikman effective medium model, to calculate local electrical properties (conductivity, dielectric constant) for both "phases" (grain core, grain boundary) from experimental AC-impedance spectra and also, for the first time, grain core volume fraction. The n-GCM method was tested on a model system (a 3D-BLM material) and demonstrated with a test case (nanograined yttria-stabilized zirconia). The method appears to be applicable only at nanograin sizes, i.e., 10-100 nm. Limitations of the method, in terms of grain size (10-100 nm) and experimental uncertainty, are also discussed.

Original languageEnglish
Pages (from-to)1733-1746
Number of pages14
JournalJournal of the American Ceramic Society
Volume91
Issue number6
DOIs
Publication statusPublished - Jun 2008

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Brick
Composite materials
Yttria stabilized zirconia
Volume fraction
Grain boundaries
Electric properties
Permittivity

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

The brick layer model revisited : Introducing the nano-grain composite model. / Kidner, Neil J.; Perry, Nicola H.; Mason, Thomas O; Garboczi, Edward J.

In: Journal of the American Ceramic Society, Vol. 91, No. 6, 06.2008, p. 1733-1746.

Research output: Contribution to journalArticle

Kidner, Neil J. ; Perry, Nicola H. ; Mason, Thomas O ; Garboczi, Edward J. / The brick layer model revisited : Introducing the nano-grain composite model. In: Journal of the American Ceramic Society. 2008 ; Vol. 91, No. 6. pp. 1733-1746.
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