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Origin of giant permittivity and high-temperature dielectric anomaly behavior in Na0.5Y0.5Cu3Ti4O12 ceramics
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10.1063/1.4809927
/content/aip/journal/jap/113/22/10.1063/1.4809927
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/22/10.1063/1.4809927

Figures

Image of FIG. 1.
FIG. 1.

Typical XRD patterns of NYCTO ceramics sintered at different temperatures for 25 h.

Image of FIG. 2.
FIG. 2.

Typical XRD patterns of NYCTO ceramics sintered at 1060 °C for different holding times.

Image of FIG. 3.
FIG. 3.

The SEM photographs of the surface of NYCTO ceramics sintered at different temperatures for 25 h: (a) 1050 °C, (b) 1060 °C, (c) 1070 °C, and (d) 1080 °C.

Image of FIG. 4.
FIG. 4.

The SEM photographs of the surface of NYCTO ceramics sintered at 1060 °C for different holding times: (a) 10 h, (b) 15 h, (c) 20 h, (d) 25 h, and (d) 30 h.

Image of FIG. 5.
FIG. 5.

The frequency dependence of (a) the real part ′, (b) the imaginary part ′′ of the dielectric constant, and (c) dielectric loss (tan ) for NYCTO ceramics sintered at different temperatures for 25 h.

Image of FIG. 6.
FIG. 6.

The frequency dependence of (a) the real part ′ of the dielectric constant, (b) dielectric loss tan , and (c) conductivity of NYCTO ceramics sintered at 1060 °C for different holding times.

Image of FIG. 7.
FIG. 7.

(a) Impedance complex plane plots for NYCTO ceramics sintered at different temperatures for 25 h. (b) Impedance complex plane plots for NYCTO ceramics sintered at 1060 °C for different holding times. The insets show an expanded view of high frequency data close to the origin.

Image of FIG. 8.
FIG. 8.

Combined ′′ and ′′ plot of NYCTO ceramics sintered at 1060 °C for 25 h at room temperature.

Image of FIG. 9.
FIG. 9.

XPS spectra of (a) Cu 2 regions and (b) Ti 2 regions of NYCTO ceramics.

Image of FIG. 10.
FIG. 10.

(a) Temperature dependence of dielectric constant for NYCTO ceramics sintered at 1060 °C for 25 h at various frequencies (from 1 kHz to 8 kHz) in the temperature range from ambient temperature to 500 °C. The insets show an expanded view of temperature dependence of dielectric constant in the temperature range from ambient temperature to 200 °C. (b) Temperature dependence of dielectric loss for NYCTO ceramics sintered at 1060 °C for 25 h.

Image of FIG. 11.
FIG. 11.

The frequency dependence of the real part ′ of the dielectric constant at 513 K for different dc bias voltages.

Image of FIG. 12.
FIG. 12.

The frequency dependence of the real part ′ of the dielectric constant at different temperatures. The inset shows the temperature dependence of the real part ′ of the dielectric constant at 1024 Hz.

Image of FIG. 13.
FIG. 13.

Plot of against at several restricted temperatures for the NYCTO sample. The solid lines are results of the best linear fitting based on Eq. (7) . Inset shows the temperature dependence of value deduced from the fitting for the sample.

Image of FIG. 14.
FIG. 14.

Imaginary part of the electric modulus ′′ as a function of frequency for the NYCTO sample measured from 25 to 400 °C. Inset shows the Arrhenius relation of vs 1000/T of the NYCTO sample.

Image of FIG. 15.
FIG. 15.

The frequency dependence of the imaginary part of the electric modulus ′′ measured from 400 to 35 °C. Inset shows the Arrhenius relation of vs 1000/T of the NYCTO sample.

Image of FIG. 16.
FIG. 16.

(a)–(c) Impedance spectra of NYCTO ceramics sintered at 1060 °C for 25 h in the frequency range of 40 Hz–2 MHz measured at different temperatures. (d) The variation of ln  against 1/ over a wide temperature region.

Tables

Generic image for table
Table I.

The calculated Rg and Rgb for NYCTO ceramics sintered at different temperatures for 25 h.

Generic image for table
Table II.

The calculated Rg and Rgb for NYCTO ceramics sintered at 1060 °C for different holding times.

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/content/aip/journal/jap/113/22/10.1063/1.4809927
2013-06-11
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Origin of giant permittivity and high-temperature dielectric anomaly behavior in Na0.5Y0.5Cu3Ti4O12 ceramics
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/22/10.1063/1.4809927
10.1063/1.4809927
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