DOI: 10.1063/1.2902374. Colossal dielectric constants in single-crystalline and ceramic CaCu3Ti4O12 investigated by broadband dielectric spectroscopy

Colossal dielectric constants in single-crystalline and ceramic CaCu3Ti4O12 investigated by broadband dielectric spectroscopy

10.1063/1.2902374

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

In the present work, the authors report results of broadband dielectric spectroscopy on various samples of CaCu3Ti4O12 (CCTO), also including single-crystalline material, which so far was only rarely investigated. The measurements extend up to 1.3 GHz, covering more than nine frequency decades. We address the question of the origin of the colossal dielectric constants and of the relaxational behavior in this material, including the second relaxation reported in several recent works. For this purpose, the dependence of the temperature- and frequency-dependent dielectric properties on different tempering and surface treatments of the samples and on ac-field amplitude is investigated. Broadband spectra of a single crystal are analyzed by an equivalent circuit description by assuming two highly resistive layers in series to the bulk. Good fits could be achieved, including the second relaxation, which also shows up in single crystals. The temperature- and frequency-dependent intrinsic conductivity of CCTO is consistent with the variable range hopping model. The second relaxation is sensitive to surface treatment and, in contrast to the main relaxation, is also strongly affected by the applied ac voltage. Concerning the origin of the two insulating layers, we discuss a completely surface-related mechanism by assuming the formation of a metal-insulator diode and a combination of surface and internal barriers.

Bibliography

Krohns, S., Lunkenheimer, P., Ebbinghaus, S. G., & Loidl, A. (2008). Colossal dielectric constants in single-crystalline and ceramic CaCu3Ti4O12 investigated by broadband dielectric spectroscopy. Journal of Applied Physics, 103(8).

Authors 4

S. Krohns (first)
P. Lunkenheimer (additional)
S. G. Ebbinghaus (additional)
A. Loidl (additional)

References 48 Referenced 194

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Dates

Type	When
Created	17 years, 4 months ago (April 22, 2008, 6:51 p.m.)
Deposited	2 years ago (Aug. 1, 2023, 10:45 p.m.)
Indexed	3 weeks, 4 days ago (Aug. 5, 2025, 8:10 a.m.)
Issued	17 years, 4 months ago (April 15, 2008)
Published	17 years, 4 months ago (April 15, 2008)
Published Online	17 years, 4 months ago (April 22, 2008)
Published Print	17 years, 4 months ago (April 15, 2008)

Funders 0

None

BibTeX

@article{Krohns_2008, title={Colossal dielectric constants in single-crystalline and ceramic CaCu3Ti4O12 investigated by broadband dielectric spectroscopy}, volume={103}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.2902374}, DOI={10.1063/1.2902374}, number={8}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Krohns, S. and Lunkenheimer, P. and Ebbinghaus, S. G. and Loidl, A.}, year={2008}, month=apr }

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