Perovskite Manganit Analysis Based on La0.7Ca0.3Mn1-xTixO3 (x=0, 0.1, 0.2, and 0.3) as Potential Microwave Absorber Material with Sol-Gel Method

Abstract

<p>Electromagnetic wave is an energy flow in the form of electric and magnetic field as the technology development causes electromagnetic wave exposure level changes significantly and resulting an electromagnetic wave radiation that leads bad impacts on human health. In this case, manganite perovskite became an interesting topic of study that aims to produce material engineering to obtain a material with the best property as absorber. This study is based on lanthanum manganite La<sub>0.7</sub>Ca<sub>0.3</sub>Mn<sub>1-x</sub>Ti<sub>x</sub>O<sub>3</sub> ( and ) using sol-gel method with the with a heating temperature in the oven of 200<sup>o</sup>C for 2 hours, calcination temperature of 600<sup>o</sup>C for 6 hours, and sintering temperature of 1000<sup>o</sup>C for 12 hours. The sample is characterized using X-Ray Diffraction (XRD) that shows the sample had succeeded to form single phase and had crystal cubic structure with space group p m -3 m, the substitution of Ti<sup>3+</sup>ions did not cause the structural changes, but it was marked with the changes of lattice parameter, unit cell volume and average crystallite size. Meanwhile Vector Network Analyzer (VNA) on the frequency range 8-12 GHz shows that the sample has ability to absorb microwave until 90.16% on 10.4 GHz frequency. Therefore, the material based on lanthanum manganite La<sub>0.7</sub>Ca<sub>0.3</sub>Mn<sub>1-x</sub>Ti<sub>x</sub>O<sub>3</sub>has the potential as the microwave absorber material.</p>

A-Site Doped in Perovskite La(1-x)Bax/2Srx/2Mn0.4Ti0.6O3 (x = 0, 0.1, and 0.3) for Absorbing Microwave Material

“…Conversely, x = 0.1 exhibits crystal and particle size variations relative to the others. While several studies employing the same synthesis method report the existence of similar impurities [6,14,15,24], the VNA data compellingly highlights the influence of x doping. Table 5 highlights reflection loss values for distinct perovskite materials.…”

“…Chen et al demonstrated that LaTiO3 exhibits a high dielectric constant when substituted with Mn at site A [13]. Subsequent research indicated that replacing Ti at site B in LaMnO3 results in a high dielectric constant [13][14][15]. Fira et al synthesized La0.7Ca0.3Mn1-xTixO3 materials (x = 0, 0.1, 0.2, and 0.3), noting the highest Reflection Loss (RL) value when x = 0.3, registering RL -10.07 dB at a frequency of 10.4 GHz, corresponding to microwave absorption of approximately 90.16% [16].…”