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Enhanced dielectric response of -doped ceramics
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Image of FIG. 1.
FIG. 1.

SEM images of ceramic samples. Panels (a), (b), (c), and (d) correspond to undoped and 2%, 5%, and 6% , respectively.

Image of FIG. 2.
FIG. 2.

Surface EDS mapping of -doped CCTO ceramic samples. Panels (a) and (b) correspond to 5% and 6% , respectively.

Image of FIG. 3.
FIG. 3.

XRD of undoped and doped CCTO samples. Peaks for the major phase and secondary ones are indicated.

Image of FIG. 4.
FIG. 4.

Frequency dependence of the real dielectric permittivity for undoped and -doped CCTO samples.

Image of FIG. 5.
FIG. 5.

Cole–Cole ( vs ) plots for the studied samples.

Image of FIG. 6.
FIG. 6.

Peak relaxation frequencies for several concentrations up to 6%.

Image of FIG. 7.
FIG. 7.

Room-temperature FTIR-reflectivity spectra of the samples. The spectra are vertically upshifted for the sake of clarity (0.2 steps).

Image of FIG. 8.
FIG. 8.

Real part of the optical conductivity calculated from KK analysis for the samples in the infrared region. The modes are numbered in agreement with Table I. The vertical dashed lines intend to show frequency shifts for some chosen peaks.


Generic image for table
Table I.

Infrared polar phonon modes obtained for CCTO undoped sample by KK integration of its room-temperature spectrum. TO (transverse) and LO (longitudinal) optical modes were obtained from peak positions of and , respectively. The two last columns give the values reported by Kant et al. for a single crystal at 5 K (Ref. 20).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhanced dielectric response of GeO2-doped CaCu3Ti4O12 ceramics