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 tempera...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 450K and frequencies from 1Hz to 1MHz.The electrical conductivity of both samples was thermally activated with potential barriers of 0.55eV and 0.59eV,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.展开更多
基金Research was supported by the Slovenian Research Agency(Grant No.P1-0125)The authors thank the Project operated within the Foun-dation for Polish Science Team Programme co-financed by the EU European Regional Development Fund and the FP7 NMP ENSEMBLE Project(GA NMP4-SL-2008-213669).
文摘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 450K and frequencies from 1Hz to 1MHz.The electrical conductivity of both samples was thermally activated with potential barriers of 0.55eV and 0.59eV,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.
