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Simulation of Impedance Spectra for a Full Three‐Dimensional Ceramic Microstructure Using a Finite Element Model
Author(s) -
Dean Julian S.,
Harding John H.,
Sinclair Derek C.
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12750
Subject(s) - microstructure , ceramic , finite element method , materials science , electrical impedance , representation (politics) , electroceramics , dielectric spectroscopy , composite material , mineralogy , physics , thermodynamics , electrical engineering , geology , engineering , chemistry , alternative medicine , law , pathology , microfabrication , fabrication , political science , electrochemistry , medicine , electrode , politics
A method of characterizing electrically heterogeneous electroceramics for a full three‐dimensional collection of randomly shaped grains is presented. Finite element modeling, solving Maxwell's equations in space and time is used to simulate impedance spectroscopy ( IS ) data. This technique overcomes several deficiencies associated with previous methods used to simulate IS data and allows comprehensive treatment of a full three‐dimensional granular representation of ceramic microstructure without the requirement for equivalent circuits based on the Brickwork layer model ( BLM ) or the introduction of constant phase elements to describe any nonideality of the IS response. This is applied to a full three‐dimensional ceramic microstructure with varying grain size and electrical properties to generate IS plots that highlight limitations of the BLM in data analysis.