Pemanfaatan Sekam Padi dan Pasir Besi Alam Sebagai Material Penyerap Dengan Metode Solid State Reaction

Abstract

The synthesis and characterization of rice husk and natural iron sand as microwave absorbing materials have been successfully carried out. This research was conducted using the Solid State Reaction Method, where the synthesis of natural iron sand from the river of Jangga Toruan Village, Lumbanjulu District Jangga Toruan Village produced the phase α − Fe2O3 (hematite). The ratio of natural iron sand and rice husk were 1:1; 1:2 and 2:1 and synthesized using the Solid State Reaction method with a calcination temperature of 900°C for 1 hour. The samples were characterized using XRF, XRD, SEM-EDX and VNA. The most dominant constituent element of natural iron sand is Fe at 49.52%wt. Based on the diffraction pattern, rice husk and iron sand as the main raw materials with the main phase a − Fe203 (hematite) and SiO2 (silica). SEM-EDX results show that when the composition of the two materials is balanced (1:1), the smallest particle size is obtained. The 1:1 sample has an average particle size of 0.212 μm, 1:2 of 0.275 μm, and 2:1 of 0.293 μm. According to the EDX analysis it can be concluded that the greater the concentration of Si in the sample, the number of Fe elements will decrease.. All samples are qualified to be microwave absorbing materials as evidenced by the absorption percentage of all samples reaching more than 80%. However, the addition of rice husk to the a − Fe203 /SiO2 material can reduce the RL in the sample. The most optimum composition Reflection loss of -17.7 dB was achieved with a sample ratio of 1:1 at a frequency of 11.06 GHz with a microwave absorption percentage of 95.9%.