Thin and temperature-resistant TiO2–Sr1−xLaxTiO3 (x = 0.1–0.3) composite ceramics for microwave absorption in the X-band

Yingying Zhou,Hui Xie,Youquan Wan,Qinlong Wen,Dan Chen,Yuanyuan Lu,Zhaowen Ren,Chaoqun Yang

doi:10.1007/s10854-021-05798-6

Abstract

Recently, high-temperature stability is a challenge in a number of microwave absorption materials. Hence, researchers are still searching for a novel material system preferably with a high-temperature resistance to be applied in the field of microwave absorption. Here, in the current study, toward this aim, lanthanum (La)-doped strontium titanate (SrTiO3) blended with TiO2 were fabricated by hot-press sintering in a vacuum. The as-prepared samples are denoted as TiO2–Sr1−xLaxTiO3 with x varying from 0.1 to 0.3 in steps of 0.1. Scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), and microwave vector network analyzer were carried out to study their morphology, phase composition, structure, and electromagnetic and microwave absorption properties, respectively. It is revealed that the La atom was efficiently doped at the Sr-site in SrTiO3. Benefiting from the tunability of its dielectric and impedance properties, TiO2–Sr1−xLaxTiO3 can be utilized in a highly efficient way to absorb microwave radiations with a decent design. Results illustrated that TiO2–Sr1−xLaxTiO3 (x = 0.2) with a thickness of only 0.42 mm exhibits a high microwave absorption efficiency of −40.89 dB and can achieve a 2.82 GHz bandwidth of reflection loss value below −5 dB. Thus, TiO2–Sr1−xLaxTiO3 composites ceramics can be served as an opening opportunity for the application of high-temperature stability and tunable high-performance effectiveness microwave absorption materials in stealth technology and information security.

Highlights

Along with the fast and fierce evolution of civil network technology and military detection technology, the protection or absorption technology of electromagnetic (EM) wave radiation is becoming of increasing significance in this day and age [1]
One most commonly used microwave absorbing materials (MAMs) is ferromagnetic materials-based absorbing materials [3, 4] or carbon-based absorbing materials [5, 6], which can absorb or attenuate EM waves using magnetic or electrical losses. They are susceptible to high-temperature oxidation, chemical corrosion, or heavyweight, which dramatically limits their applications in the field of microwave absorption
Two main phases were present in the X-ray diffraction (XRD) patterns of the TiO2-Sr1-xLaxTiO3 ceramics that could be assigned to the reflections of SrTiO3(JCPDS card No 89-4934)) and TiO2(JCPDS card No 21-1276). It indicates that the XRD diffraction pattern of Sr1-xLaxTiO3 is highly consistent with the standard card of SrTiO3 to a certain degree

Summary

Introduction

Along with the fast and fierce evolution of civil network technology and military detection technology, the protection or absorption technology of electromagnetic (EM) wave radiation is becoming of increasing significance in this day and age [1]. In order to address this issue, microwave absorbing materials (MAMs) are increasingly being studied for their isolating and absorbing the EM wave from the surroundings. One most commonly used MAMs is ferromagnetic materials-based absorbing materials [3, 4] or carbon-based absorbing materials [5, 6], which can absorb or attenuate EM waves using magnetic or electrical losses. They are susceptible to high-temperature oxidation, chemical corrosion, or heavyweight, which dramatically limits their applications in the field of microwave absorption

Methods

Discussion

Conclusion