NDLI: Effects of Processing Conditions on the Dielectric Properties of CaCu$_{3}$Ti$_{4}$O$

Content Provider	Springer Nature Link
Author	Aygün, Seymen Tan, Xiaoli Maria, Jon Paul Cann, David
Copyright Year	2005
Abstract	There have been a number of recent reports of anomalously large permittivities (ε$_{r}$≈ 10$^{4}$) in the material CaCu$_{3}$Ti$_{4}$O$_{12}$. The dielectric spectra is characterized by a large, relatively temperature independent permittivity near room temperature which exhibits a dielectric relaxation above 100 K. The crystal structure of CaCu$_{3}$Ti$_{4}$O$_{12}$ can be described as pseudo-perovskite with a cubic unit cell with a lattice constant of 7.391 Å. The ubiquitous occurrence of this dielectric behavior in ceramics, single crystals, and thin films suggests that the polarization is not related to a simple conducting grain/insulating grain boundary-type system. While the precise origin of the dielectric response is not entirely clear, in this work it is shown that processing conditions have a significant influence on the room temperature dielectric properties. Specifically, the permittivity and loss exhibit a strong dependence on the oxygen partial pressure and sintering time. In fact, studies of the effects of sintering time and supporting evidence from capacitance-voltage measurements conclusively show that there is no direct relationship between the permittivity and grain size, as is the case in classical boundary layer systems. Lastly, with aliovalent doping the room temperature dielectric properties can be optimized to provide a high permittivity (ε$_{r}$ ∼ 8,000) dielectric with relatively low loss (tan δ < 0.05 at 1 kHz).
Starting Page	203
Ending Page	208
Page Count	6
File Format	PDF
ISSN	13853449
Journal	Journal of Electroceramics
Volume Number	15
Issue Number	3
e-ISSN	15738663
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	dielectric materials space charge perovskite Maxwell-Wagner Crystallography Characterization and Evaluation Materials Optical and Electronic Materials Ceramics, Glass, Composites, Natural Methods Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Effect of sintering conditions on microstructure and dielectric properties of CaCu$_{3}$Ti$_{4}$O$_{12}$ (CCTO) ceramics

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