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Giant dielectric permittivity observed in CaCu3Ti4O12∕(Li,Ti)-doped NiO composites
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The giant values of the dielectric permittivity as high as ε′∼105 at various frequencies (f=100kHz–1MHz) over a broad temperature range of −50–190°C have been observed in polycrystalline CaCu3Ti4O12 ceramics that are reinforced with small amount of Li0.3Ti0.02Ni0.68O nanoparticles of 39nm. This enormous dielectric permittivity is even higher than that of CaCu3Ti4O12 single crystals. The dielectric behavior of CaCu3Ti4O12 and CaCu3Ti4O12–Li0.3Ti0.02Ni0.68O composites exhibits Debye-like relaxation which can be interpreted based on Maxwell-Wagner model. The dielectric dispersion of the composites was discussed based on internal boundary layer capacitor effect.
Title: Giant dielectric permittivity observed in CaCu3Ti4O12∕(Li,Ti)-doped NiO composites
Description:
The giant values of the dielectric permittivity as high as ε′∼105 at various frequencies (f=100kHz–1MHz) over a broad temperature range of −50–190°C have been observed in polycrystalline CaCu3Ti4O12 ceramics that are reinforced with small amount of Li0.
3Ti0.
02Ni0.
68O nanoparticles of 39nm.
This enormous dielectric permittivity is even higher than that of CaCu3Ti4O12 single crystals.
The dielectric behavior of CaCu3Ti4O12 and CaCu3Ti4O12–Li0.
3Ti0.
02Ni0.
68O composites exhibits Debye-like relaxation which can be interpreted based on Maxwell-Wagner model.
The dielectric dispersion of the composites was discussed based on internal boundary layer capacitor effect.
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