Dielectric properties and crystal structure of (Mg0.95Ni0.05)4(Nb1−xTax)2O9 ceramics

The rapid growth of recent wireless communication systems led to an increasing demand for small-scale high-frequency resonators, filters and antennas capable of operating in the GHz range [1-3]. The unique electrical properties of ceramic dielectric resonators have revolutionized the microwave-based wireless communications industry by reducing the size and cost of filter and oscillator components in circuit systems [4,5]. At the same time, in order to work with high efficiency and stability, many researches have been focusing on developing new dielectric materials with a high quality factor (Q × f) and a near-zero temperature coefficient of resonant frequency (τf) for use as dielectric resonator and microwave device substrate [6-8].