Abstract Titanium nitride (TiN) with high-temperature plasmonic property can be a promising candidate for metamaterials at radio-frequency region. In this paper, pure TiN powders were pretreated by a facile oxidation process. The introduced titanium oxide was in favor of sintering of TiN, and further controlled the dielectric properties of TiN bulks. The radio-frequency (10 MHz-1 GHz) permittivity spectra of the obtained samples were investigated in detail. Negative permittivity was achieved using TiN based ceramic and it was tailorable by the oxidation temperatures of powders before sintering. The negative permittivity induced by plasma oscillations of conductive electrons was analyzed by Drude model. Interestingly, the zero-crossing points of permittivity from negative to positive were depend on the porous microstructure and weakly conductive titanium oxynitride, as well as the scattering effect by grain boundaries and impurity atoms. The conduction loss is dominant in determining the high dielectric loss. The realization of tunable negative permittivity using TiN gives a new and simple method to achieve negative electromagnetic parameters in single-phase materials.

中文翻译：

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不同氧化预处理烧结氮化钛的可定制射频负介电常数

摘要 具有高温等离子体特性的氮化钛 (TiN) 是一种很有前景的射频超材料候选材料。在本文中，纯 TiN 粉末通过简单的氧化过程进行了预处理。引入的氧化钛有利于 TiN 的烧结，并进一步控制 TiN 块体的介电性能。详细研究了所得样品的射频（10 MHz-1 GHz）介电常数谱。负介电常数是使用 TiN 基陶瓷实现的，并且可以通过烧结前粉末的氧化温度进行调整。用德鲁德模型分析了由导电电子的等离子体振荡引起的负介电常数。有趣的是，介电常数从负到正的零交点取决于多孔微结构和弱导电氧氮化钛，以及晶界和杂质原子的散射效应。传导损耗在决定高介电损耗方面起主导作用。使用 TiN 实现可调负介电常数提供了一种新的简单方法来实现单相材料中的负电磁参数。