Sembiring, Simon and Riyanto, Agus and Simanjuntak, Wasinton and Situmeang, Rudy T.M (2017) Effect of MgO-SiO2Ratio on the Forsterite (Mg2SiO4) Precursors Characteristics Derived from Amorphous Rice Husk Silica. ORIENTAL JOURNAL OF CHEMISTRY, 33 (4). pp. 1828-1836. ISSN 0970-020 X

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Abstract

This study acquires the potential of rice husk silica for production forsterite precursors using sol-gel method. The samples preparation were conducted by mixing magnesium oxide sol from Mg(NO3)2.6.12H2O with silica sol extracted from rice husk, with three different composition ratios of MgO to SiO2 are 1:1, 2:3 and 3:2 by weight and sintered at 900oC. The samples were characterized using Fourier transform infrared (FTIR) spectroscopy, x-ray diffraction (XRD),differential thermal analysis (DTA), followed by scanning electron microscopy (SEM). The FTIR results showed the presence of Si-O-Si, Mg-O and Mg-O-Si functional groups, which were associated with forsterite, enstatite, cristobalite and periclase, according to the XRD analysis. The formation of forsterite (Mg2SiO4) is composition-dependent as revealed the increase of forsterite intensity after sintered at 900oC in ratio 3:2. The surface morphology of non-sintered samples shows that particle and grain size were larger than particle and grain size of sintered samples. Also, SEM analysis of sintered samples clearly shows the presence of regular particle size with smaller grain size was found in ratio of MgO to SiO2 is 3:2. DTA analysis revealed that the formation of forsterite increased with increasing temperature. In addition, the electrical resistivities of the samples were found in the range of 0.75 x 1013 to 3.30 x 1013W-cm, demonstrating that the samples exhibit good potential as isolator. KEYWORDS: Forsterite; rice husk; sintering; structure; microstructure

Item Type: Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA) > Prodi Fisika
Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA) > Prodi Kimia
Depositing User: Agus Riyanto
Date Deposited: 10 Nov 2017 15:29
Last Modified: 10 Nov 2017 15:29
URI: http://repository.lppm.unila.ac.id/id/eprint/4270

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