Aurivillius Na0.5Bi4.5Ti4O15 and Bi4Ti3O12 compounds were synthesized via solid-state reaction technique. X-ray powder diffraction study confirmed monophasic four-layered Na0.5Bi4.5Ti4O15 and three-layered Bi4Ti3O12 ceramics. Dielectric relaxation and conduction behaviors of Na-contained Na0.5Bi4.5Ti4O15 ceramics were thoroughly investigated in a large scale of temperature of 30–650 °C and frequency of 40 Hz–1 MHz. In addition, comparative studies of both the compounds were discussed. Impedance and modulus analyses revealed a single relaxation behavior in Na0.5Bi4.5Ti4O15 compound which was originated from the grain’s interior with grain resistance of 2.189 × 105 Ω and capacitance of 4.268 × 10−10 F at 570 °C. While in Bi4Ti3O12 ceramic the relaxation was due to the contributions of grain and grain boundaries. Alternating current (AC) conductivity analysis revealed the presence of two different conduction regions in both the compounds. Activation energies for the two different conduction mechanisms, i.e., in low-temperature region and in high-temperature region were calculated to be ~ 0.23 and ~ 1.27 eV at 1 kHz for Na0.5Bi4.5Ti4O15 compound and ~ 0.43 eV and ~ 0.97 eV at 1 kHz for Bi4Ti3O12 compound, respectively. The present study of dielectric relaxation and conduction behaviors would be helpful for further investigations of Na0.5Bi4.5Ti4O15-related Aurivillius compounds.

中文翻译：

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Na掺杂Aurivilius Na0.5Bi4.5Ti4O15陶瓷的介电弛豫和导电行为

通过固相反应技术合成了Aurivilius Na0.5Bi4.5Ti4O15 和Bi4Ti3O12 化合物。X 射线粉末衍射研究证实了单相四层​​ Na0.5Bi4.5Ti4O15 和三层 Bi4Ti3O12 陶瓷。在 30–650 °C 的温度和 40 Hz–1 MHz 的频率范围内，对含 Na 的 Na0.5Bi4.5Ti4O15 陶瓷的介电弛豫和传导行为进行了彻底的研究。此外，还讨论了这两种化合物的比较研究。阻抗和模量分析揭示了 Na0.5Bi4.5Ti4O15 化合物的单一弛豫行为，该化合物起源于晶粒内部，晶粒电阻为 2.189 × 105 Ω，电容为 4.268 × 10−10 F 在 570 °C。而在 Bi4Ti3O12 陶瓷中，弛豫是由于晶界和晶界的贡献。交流电 (AC) 电导率分析揭示了两种化合物中存在两个不同的传导区域。对于 Na0.5Bi4.5Ti4O15 化合物，计算出两种不同传导机制（即低温区和高温区）的活化能为 ~ 0.23 和 ~ 1.27 eV，1 kHz 时为 ~ 0.43 eV 和 ~ 0.97 eV对于 Bi4Ti3O12 化合物，分别为 1 kHz。目前对介电弛豫和传导行为的研究将有助于进一步研究与 Na0.5Bi4.5Ti4O15 相关的 Aurivilius 化合物。5Ti4O15 化合物，Bi4Ti3O12 化合物在 1 kHz 时分别为 ~ 0.43 eV 和 ~ 0.97 eV。目前对介电弛豫和传导行为的研究将有助于进一步研究与 Na0.5Bi4.5Ti4O15 相关的 Aurivilius 化合物。5Ti4O15 化合物，Bi4Ti3O12 化合物在 1 kHz 时分别为 ~ 0.43 eV 和 ~ 0.97 eV。目前对介电弛豫和传导行为的研究将有助于进一步研究与 Na0.5Bi4.5Ti4O15 相关的 Aurivilius 化合物。