Giant Dielectric-Permittivity Property of NaCu3Ti3NbO12 and NaCu3Ti3SbO12 Ceramics and Low Dielectric Loss in NaCu3Ti3SbO12 Ceramics

doi:10.3724/SP.J.1077.2014.13212

Abstract

Abstract: NaCu₃Ti₃NbO₁₂ and NaCu₃Ti₃SbO₁₂ ceramics were prepared by the conventional solid state reaction method, and their dielectric properties and crystalline structure were investigated. It was found that they were quite similar with the CaCu₃Ti₄O₁₂ ceramics, showing giant dielectric-permittivity properties with ε' larger than 7×10³. Within the measuring frequency range of 40 Hz-100 MHz, a single dielectric relaxation with the characteristic frequency around 1 MHz was detected at room temperature or below whereas an additional one in low frequency region is also observed at high temperatures. Furthermore, the existence of CuO secondary phase was confirmed by X-ray diffraction. In general, the results can be explained by the similar mechanism of internal barrier layer capacitance effect which was formerly proposed for CaCu₃Ti₄O₁₂ceramics. Here, it is worthy pointing out that the tanδ of NaCu₃Ti₃SbO₁₂ ceramics is lower than 0.05 in a large frequency range from 40 Hz to 7 kHz, and the tanδ at 1 kHz is lower than 0.05 in a large temperature range of -50℃ to 80℃ at 1 kHz, which is a desirable characteristic for practical applications.

Key words: NaCu₃Ti₃NbO₁₂, NaCu₃Ti₃SbO₁₂, giant dielectric-permittivity phenomena, internal barrier layer capacitance effect

CLC Number:

TM283

HAO Wen-Tao, XU Pan-Pan, ZHANG Jia-Liang, CAO En-Si, PENG Hua. Giant Dielectric-Permittivity Property of NaCu₃Ti₃NbO₁₂ and NaCu₃Ti₃SbO₁₂ Ceramics and Low Dielectric Loss in NaCu₃Ti₃SbO₁₂ Ceramics[J]. Journal of Inorganic Materials, 2014, 29(1): 62-66.

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Giant Dielectric-Permittivity Property of NaCu₃Ti₃NbO₁₂ and NaCu₃Ti₃SbO₁₂ Ceramics and Low Dielectric Loss in NaCu₃Ti₃SbO₁₂ Ceramics

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