Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 58, Issue 1, Pages 33-41Publisher
SPRINGER
DOI: 10.1007/s10971-010-2351-1
Keywords
Sol-gel process; Calcium silicate; Dielectric materials; Eggshells
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Funding
- Kasetsart University
- Conductive and Electroactive Polymers Research Unit
- Thailand Research Fund (TRF-BRG)
- Royal Thai Government
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Calcium silicate (CaSiO3), wollastonite, with a molar ratio of CaO:SiO2 of 1:1, was synthesized by a sol-gel process and sintered at 1,100A degrees C for 1 h. The synthesis of calcium silicate was carried out using chicken eggshells as the starting material possessing several advantages such as low cost, high purity, and less moisture sensitivity, when compared with those obtained from metal alkoxide precursors via the sol-gel process. The CaSiO3 samples have the triclinic or anorthic phase formations and good electrical properties. The dielectric constant and electrical conductivity are 62.59 +/- A 0.44 and 8.0052 x 10(-4) (Omega.m)(-1), respectively, at 25A degrees C and 1 MHz. The transmission electron microscopy (TEM) images of the samples show a good dispersion and uniform particles with an average diameter of about 0.5 nm. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), and Simultaneous thermal analysis (STA) were used to verify the synthesis.
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