Dielectric Spectrum of CaCu3Ti4012 from the Giant Permittivity to its Negative Values

Yurii Kabirov; Victor Gavrilyachenko; Evgeni Panchenko; Evgeni Milov; Anatoly Klenushkin

doi:10.4028/www.scientific.net/AMR.705.52

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 705Dielectric Spectrum of CaCu3Ti4012 from the Giant...

Dielectric Spectrum of CaCu₃Ti₄0₁₂ from the Giant Permittivity to its Negative Values

Abstract:

The dielectric spectrum of CaCu₃Ti₄O₁₂ samples prepared by traditional "one step" ceramic technology is analyzed. It is established that the characteristic Debye-type dispersion with an activation energy 0, 075 eV manifests in the high-frequency range (f ~ 10⁶ Hz). In the low-frequency region (f< 10² Hz) a transition from giant permittivity values to its negative values is detected in some samples. Conditions for such transition are discussed.