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Experimental Evidence of a Giant Capacitance in Insulator–Conductor Composites at the Percolation Threshold
Author(s) -
Pecharromán C.,
Moya J. S.
Publication year - 2000
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/(sici)1521-4095(200002)12:4<294::aid-adma294>3.0.co;2-d
Subject(s) - materials science , dielectric , capacitance , composite material , ceramic , insulator (electricity) , percolation threshold , supercapacitor , conductor , mullite , composite number , electrode , optoelectronics , electrical engineering , electrical resistivity and conductivity , chemistry , engineering
Giant enhancement of the dielectric properties has been measured at the percolation threshold of a metal–insulator functional, graded composite using an in–situ electrical probe. The system reported (Mullite–Mo) combines very good thermal stability, low leakage currents, and very high capacitance, using dielectric materials with a low dielectric constant. Thus, devices made using this type of ceramic–metal supercapacitor may cover an important technological gap in high charge‐storage devices, which could lead to a new generation of ceramic supercapacitors.