TITLE

Mixed protonic-electronic conduction and dielectric response in layered vanadyl phosphate nanocomposites

AUTHOR(S)
De, Sukanta; Dey, Arup; De, S. K.
PUB. DATE
December 2006
SOURCE
Journal of Chemical Physics;12/14/2006, Vol. 125 Issue 22, p224704
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The layered vanadyl phosphate, VOPO4·2H2O, is employed to prepare nanosized conducting polypyrrole by redox intercalation method. Transport and dielectric properties of various compositions have been investigated by impedance technique over a temperature range of 300–120 K. Grain boundary conductivity is larger than the bulk conductivity. The conductivity reveals a discontinuity at about 212–235 K. The conductivity is predominantly ionic at high temperature and electronic at low temperature. The dielectric spectra reveal a peak in the frequency range up to 2 MHz for higher concentration of intercalated polypyrrole. The activation energy of conductivity relaxation is different from that of total conductivity derived from the impedance plot.
ACCESSION #
23489473

 

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