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Dielectric and nonlinear current–voltage characteristics of rare–earth doped CaCu3Ti4O12 ceramics
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10.1063/1.3658258
/content/aip/journal/jap/110/9/10.1063/1.3658258
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/9/10.1063/1.3658258

Figures

Image of FIG. 1.
FIG. 1.

XRD patterns of undoped and rare–earth doped CCTO ceramics.

Image of FIG. 2.
FIG. 2.

BES–SEM images of the fracture surfaces of CCTO ceramics with different dopants: (a) undoped CCTO, (b) Y–doped CCTO, (c) La–doped CCTO, (d) Eu–doped CCTO, and (e) Gd–doped CCTO.

Image of FIG. 3.
FIG. 3.

(Color online) Dielectric permittivity and dielectric loss factor as functions of frequency of undoped and rare–earth doped CCTO ceramics.

Image of FIG. 4.
FIG. 4.

(Color online) Impedance plots (Z* plots Z’’ vs Z) of CCTO ceramics with different dopants with a dc bias of 0, 10, 20, 30, and 40 V: (a) undoped CCTO, (b) Y–doped CCTO, (c) La–doped CCTO, (d) Eu–doped CCTO, and (e) Gd–doped CCTO. The inset shows an expanded view of the high frequency data close to the origin. The solid line is the simulation of the impedance plot with 0 V dc bias by an equivalent circuit model with series combination of parallel RC elements.

Image of FIG. 5.
FIG. 5.

Current–voltage characteristics of undoped and rare–earth doped CCTO ceramics.

Image of FIG. 6.
FIG. 6.

Plots of ln(J/AT 2) versus E 1/2 for undoped and rare–earth doped CCTO ceramics.

Tables

Generic image for table
Table I.

Nonlinear coefficient (α), breakdown voltage (Eb ), barrier heights (ФB ), depletion layer width (w), and Ns 2 /Nd of undoped and rare-earth doped CCTO ceramics.

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/content/aip/journal/jap/110/9/10.1063/1.3658258
2011-11-01
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dielectric and nonlinear current–voltage characteristics of rare–earth doped CaCu3Ti4O12 ceramics
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/9/10.1063/1.3658258
10.1063/1.3658258
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