Percolation and modeling of proton conduction in polymer/brushite composites

Citation
L. Tortet et al., Percolation and modeling of proton conduction in polymer/brushite composites, J SOL ST CH, 141(2), 1998, pp. 392-403
Citations number
16
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
JOURNAL OF SOLID STATE CHEMISTRY
ISSN journal
00224596 → ACNP
Volume
141
Issue
2
Year of publication
1998
Pages
392 - 403
Database
ISI
SICI code
0022-4596(199812)141:2<392:PAMOPC>2.0.ZU;2-#
Abstract
Composites have been fabricated by compressing polycrystalline brushite mix ed with a polymer powder into pellets to study the surface activities and p roton mobilities of acid CaHPO4 . 2H(2)O phosphates (brushite), The electro chemical properties of such composites are studied using complex impedance spectroscopy analyses. Two types of surface proton migrations have been obs erved by following the water content of the samples. The various proton mig rations through these granular materials and the percolation threshold of t hese currents are interpreted using various modeling approaches. Three mode ls are used and compared: the effective medium approximation (EMA), a model based on the percolation theory, and a semiempirical microstructural elect rical model. (C) 1998 Academic Press.