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Dielectric relaxation in pure and Co-doped Bi12GeO20 single crystals
Ist Teil von
Journal of advanced dielectrics, 2015-09, Vol.5 (3), p.1550023-1550023-5
Ort / Verlag
Singapore: The Author(s)
Erscheinungsjahr
2015
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
We report the results of investigation of dielectric spectroscopy study of single crystals of
Bi
12
GeO
20
and
Bi
12
GeO
20
doped with Co nanoparticles. The complex dielectric constant was measured in the temperature interval from 5 to 450 K and frequencies from 1 Hz to 1 MHz. The electrical conductivity of both samples was thermally activated with potential barriers of 0.55 eV and 0.59 eV, respectively. Doped samples had bigger complex dielectric constants and
σ
′
exhibited slightly steeper temperature dependence than in the pure sample. The dielectric relaxation was observed in pure and doped single crystals and relaxation frequencies showed similar activation energies as electrical conductivities.