Microwave and Electrical Properties of Zr-Doped SrTiO₃ for Dielectric Resonator Antenna Application

Abstract

Present investigation provides experimental studies on cylindrical dielectric resonator antennas (CDRAs) fabricated from SrTi1-xZrxO3ceramic with different substitution of Zr in place of Ti for (0 ≤ x ≤1). Ceramic powder were prepared using conventional solid state reaction method. X-ray Diffraction exposes physical properties Zr-doped SrTiO3which exhibit phase transition from cubic, tetragonal to orthorhombic phase. The electrical properties such as dielectric constant (εr) and dielectric loss (tan δ) were studied in variation of temperatures and frequencies. At room temperature the dielectric constant decreased from 240 to 21 with increase of Zr content however the amazing result was obtained for multiband antenna by Zr content. The dielectric loss obtain shows very low loss value roughly below 0.07 for all samples. The variations of return loss, resonance frequency and bandwidth of CDRAs at their respective resonant frequencies are studied experimentally.

Resistive Switching Memory Cell Property Improvement by Al/SrZrTiO3/Al/SrZrTiO3/ITO with Embedded Al Layer

“…Numerous attempts have been exerted to further improve the properties of SrTiO 3 -based ceramics. Doping is considered an effective approach for altering their properties [2]. Reproducible resistive switching behaviors have been observed in doped perovskite oxide films [3,4], such as Mo-doped SrTiO 3 [5], Mg-doped SrTiO 3 [6], Nb-doped SrTiO 3 films [7], and Ni-doped SrTiO 3 films [3].…”

“…Reproducible resistive switching behaviors have been observed in doped perovskite oxide films [3,4], such as Mo-doped SrTiO 3 [5], Mg-doped SrTiO 3 [6], Nb-doped SrTiO 3 films [7], and Ni-doped SrTiO 3 films [3]. Several studies have indicated that Zr 4+ in SrTiO 3 can stabilize the charge of Ti 4+ and suppress oxygen dissociation [1,2,8]. In addition, our previous study showed that the addition of Zr can effectively improve the surface morphology of insulators [9].…”