Abstract

We report the synthesis and promising electrical properties of a new lead-free ferroelectric ceramic K_0.5Bi_0.5TiO₃-NaNbO₃ (KBT-NN), which can be a candidate of choice for future sensors, FeRAM etc. Mixed-oxide method has been employed to prepare the compound comprising of uniformly distributed grains. Detailed structural analysis revealed its orthorhombic structure with space group Pmc2₁. In-depth analysis of the electrical characterization data revealed a band-gap of 3.11 eV and presence of defects in the bands. Further, ferroelectric phase transition is observed to occur at 395 °C. The dielectric properties of the material, investigated over a wide range of frequencies and temperatures, indicate that its ac conductivity depends upon frequency according to Jonscher’s power law.

中文翻译：

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无铅铁电陶瓷K 0.5 Bi 0.5 TiO 3 -NaNbO 3的合成及介电谱研究

摘要

我们报告了一种新型的无铅铁电陶瓷K _0.5 Bi _0.5 TiO ₃ -NaNbO ₃（KBT-NN）的合成和有前途的电性能，它可以作为未来传感器，FeRAM等的选择。混合氧化物法具有用于制备由均匀分布的晶粒组成的化合物。详细的结构分析显示，其空间群为Pmc2 _1的正交结构。。对电特性数据的深入分析显示，带隙为3.11 eV，并且带中存在缺陷。此外，观察到在395℃发生铁电相变。在广泛的频率和温度范围内进行研究的材料介电性能表明，根据Jonscher幂定律，其交流电导率取决于频率。