Synthesis and characterization microwave absorber properties of La_0.7(Ca_1-xSr_x)_0.3MnO₃ prepared by Sol-Gel method

Abstract

In this research, structural engineering of lanthanum-manganate-based material was studied, starting with material synthesizing La0.7(Ca1-xSrx)0.3MnO3 with variation of x=0; 0.1; 0.2; and 0.3 using the sol-gel method as a microwave material. The effects of Sr substitution on the stucture, size of grain, and microwave-absorbing properties were investigated in detail by various analytical methods. Using XRD (X-Ray Diffraction) showed that the sample had single phase and orthorombic structure (space group of Pnma), substitution of Sr2 + ions did not cause changes in structure. Characterized using SEM (Scanning Electron Microscope) showed change in grain size which increase when given Sr substitution. Characterized using VNA (Vector Network Analyzer) in the 8-12 GHz range shows that the sample La0.7(Ca1-xSrx)0.3MnO3 with x=0 has been able to absorb up to 55.64% microwaves at 10.44GHz. The study concluded the material of La0.7(Ca1-xSrx)0.3MnO3 have a good potential to be a candidate of microwave absorbing materials.

Analysis of crystal structure and reflection loss of material based on La0.7Sr0.3Mn1-x(Ni, Ti)x/2O3 (x=0.1, 0.3, and 0.5) applications for microwave absorbers

“…The rapid development of technology in tshe telecommunications sector causes electromagnetic wave interference pollution, specifically microwaves, which can reduce the performance of vital electronic-based equipment systems. It is also believed that radiation from microwaves originating from cell-phone signals can trigger cancer cells (Admi et al 2021). This has made many researchers interested in developing a material that is able to absorb electromagnetic waves.…”