Charge transfer in the high dielectric constant materials CaCu3Ti4O12 and CdCu3Ti4O12

Abstract

The cubic perovskite-related ceramic CaCu3Ti4O12 has a very high static dielectric constant ~10000 at room temperature (RT), which drops to about 100 below about 100 K. Substituting Cd for Ca reduces the RT value of the dielectric constant by over an order of magnitude. The large the dielectric constant may be due to an internal barrier layer capacitance (IBLC) effect. Infrared optical properties show a low-frequency mode that increases dramatically in strength at low temperature, suggesting a change in the effective charges and a breakdown of the IBLC model due to a semiconductor-to-insulator transition.

4 pages with 4 embedded EPS figures

References in corpus (2)

• Materials with Colossal Dielectric Constant: Do They Exist?
• A first-principles study of the structure and lattice dielectric response of CaCu{3}Ti{4}O{12}

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• Evidence for power-law frequency dependence of intrinsic dielectric response in the CaCu${}_3$Ti${}_4$O${}_{12}$
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• Broadband dielectric response of CaCu3Ti4O12: From dc to the electronic transition regime
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• Far-infrared optical properties of the pyrochlore spin ice compound Dy2Ti2O4
• Optical study of the vibrational and dielectric properties of BiMnO3
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• Electronic structure of Mott-insulator CaCu3Ti4O12: Photoemission and inverse photoemission study
• Infrared phonon spectrum of the tetragonal helimagnet Ba${}_2$CuGe${}_2$O${}_7$
• A Low-Temperature Specific Heat Study of the Giant Dielectric Constant Materials
• Temperature dependence of the electronic structure of A-site ordered perovskite CaCu${}_3$Ti${}_4$O${}_{12}$: Angle-integrated and -resolved photoemission studies