Brick layer model analysis of nanoscale-to-microscale cerium dioxide

Jin Ha Hwang, D. S. Mclachlan, Thomas O Mason

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

The frequency-dependent impedance/dielectric behavior of the brick-layer model (BLM) was investigated vs. grain size and local parameters (resistivity, dielectric constant, and grain boundary width). The simulation shows a maximum in capacitance vs. grain size, governed by the grain boundary-to-grain interior resistivity ratio. The BLM was employed to analyze the 500 °C impedance behavior of polycrystalline cerium dioxide from the nano- (approximately 15 nm grain size) to the micro- (approximately 4 μm grain size) regime. The grain boundary resistivity is orders of magnitude larger than that of the grain interiors in the microcystalline specimen. This contrast is significantly smaller in the nanocrystalline specimens, suggesting enhanced conduction at grain boundaries. The limitations of the BLM for simulating the behavior of complex electroceramic microstructures are discussed.

Original languageEnglish
Pages (from-to)7-16
Number of pages10
JournalJournal of Electroceramics
Volume3
Issue number1
DOIs
Publication statusPublished - 1999

    Fingerprint

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this