Journal ArticleDOI
CaCu3Ti4O12: One-step internal barrier layer capacitor
TLDR
Subramanian et al. as discussed by the authors attributed the giant-dielectric phenomenon to a grain boundary (internal) barrier layer capacitance (IBLC) instead of an intrinsic property associated with the crystal structure.Abstract:
There has been much recent interest in a so-called “giant-dielectric phenomenon” displayed by an unusual cubic perovskite-type material, CaCu3Ti4O12; however, the origin of the high permittivity has been unclear [M. A. Subramanian, L. Dong, N. Duan, B. A. Reisner, and A. W. Sleight, J. Solid State Chem. 151, 323 (2000); C. C. Homes, T. Vogt, S. M. Shapiro, S. Wakimoto, and A. P. Ramirez, Science 293, 673 (2001); A. P. Ramirez, M. A. Subramanian, M. Gardel, G. Blumberg, D. Li, T. Vogt, and S. M. Shapiro, Solid State Commun. 115, 217 (2000)]. Impedance spectroscopy on CaCu3Ti4O12 ceramics demonstrates that they are electrically heterogeneous and consist of semiconducting grains with insulating grain boundaries. The giant-dielectric phenomenon is therefore attributed to a grain boundary (internal) barrier layer capacitance (IBLC) instead of an intrinsic property associated with the crystal structure. This barrier layer electrical microstructure with effective permittivity values in excess of 10 000 can be fa...read more
Citations
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Journal ArticleDOI
Magnetocapacitance without magnetoelectric coupling
TL;DR: The existence of a magnetodielectric (magnetocapacitance) effect is often used as a test for multiferroic behavior in new material systems.
Journal ArticleDOI
Strong nonlinear current-voltage behaviour in perovskite-derivative calcium copper titanate.
TL;DR: It is demonstrated that, in addition to high permittivity, CaCu3Ti4O12 has remarkably strong nonlinear current–voltage characteristics without the addition of any dopants.
Journal ArticleDOI
Polymer Composite and Nanocomposite Dielectric Materials for Pulse Power Energy Storage
Peter Barber,Shiva Balasubramanian,Yogesh Kumar Anguchamy,Shushan Gong,Arief Wibowo,Hongsheng Gao,Harry J. Ploehn,Hans-Conrad zur Loye +7 more
TL;DR: In this article, a review summarizes the current state of polymer composites used as dielectric materials for energy storage, focusing on materials: polymers serving as the matrix, inorganic fillers used to increase the effective dielectrics constant, and various recent investigations of functionalization of metal oxide fillers to improve compatibility with polymers.
Journal ArticleDOI
Colossal dielectric constants in transition-metal oxides
TL;DR: In this paper, a detailed overview and discussion of the dielectric properties of CaCu3Ti4O12 and related transition-metal oxides with large dielectoric constants is provided.
Journal ArticleDOI
Characterization of the Structural, Optical, and Dielectric Properties of Oxynitride Perovskites AMO2N (A = Ba, Sr, Ca; M = Ta, Nb)
TL;DR: In this article, the average crystal structure of BaTaO2N is a cubic perovskite, with a Ta−O/N distance of 2.056 A. The optical band gaps are estimated from diffuse reflectance spectra as follows:
References
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Journal ArticleDOI
Electroceramics: Characterization by Impedance Spectroscopy
TL;DR: In this paper, the authors used impedance spectroscopy for unravelling the complexities of such materials, which functions by utilizing the different frequency dependences of the constituent components for their separation, and showed that electrical inhomogeneities in ceramic electrolytes, electrode/electrolyte interfaces, surface layers on glasses, ferroelectricity, positive temperature coefficient of resistance behavior and even ferrimagnetism can all be probed, successfully.
Journal ArticleDOI
High Dielectric Constant in ACu3Ti4O12 and ACu3Ti3FeO12 Phases
TL;DR: In this article, the dielectric properties of isostructural compounds of the type A 2/3 Cu 3 Ti 4 O 12 (A =trivalent rare earth or Bi) have been presented.
Journal ArticleDOI
Optical Response of High-Dielectric-Constant Perovskite-Related Oxide
TL;DR: Optical conductivity measurements on the perovskite-related oxide CaCu3Ti4O12 provide a hint of the physics underlying the observed giant dielectric effect in this material, suggesting the presence of a strong absorption at very low frequencies due to dipole relaxation.
Journal ArticleDOI
Giant dielectric constant response in a copper-titanate
Arthur P. Ramirez,Munirpallam A. Subramanian,Margaret L. Gardel,Girsh Blumberg,Der-Chiang Li,Thomas Vogt,S. M. Shapiro +6 more
TL;DR: In this paper, the authors describe a material, cubic CaCu 3 Ti 4 O 12, which exhibits a large dielectric response, the temperature-dependence of which has not been seen, to our knowledge, in any existing material.
Journal ArticleDOI
Characterization of Lanthanum-Doped Barium Titanate Ceramics Using Impedance Spectroscopy
TL;DR: In this article, the electrical properties of two single phase, lanthanum-doped BaTiO3 compositions, x= 0.03 and x = 0.20, were investigated by impedance spectroscopy after heat treatment in oxygen, argon, and air at 1350°C.