Dielectric and thermal properties of Na2O-CaO-SiO2- MgO-Al2O3-TiO2 glass-ceramic
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The Na2O-CaO-SiO2-MgO-Al2O3-TiO2 (NCSMAT) glass-ceramic having the composition of 49 Na2O, 19 CaO, 31 SiO2,0.25 MgO, 0.50 Al2O3 and 0.25 TiO2 (wt.%) was prepared by conventional method. The crystal structure, phase composition,microstructural, chemical, thermal and dielectric properties of the glass-ceramic were investigated. Using the X-ray diffraction(XRD) results, biphasic structure of the glass-ceramic sample was detected, the crystallite size was found to be 13.21 nm forNa4CaSi3O9 phase and 11.02 nm for Na8Al4Si4O18 phase, and the crystallinity percent was calculated to be 86.74 %. Scanningelectron microscope (SEM) observations show that the NCSMAT glass-ceramic has the fine-grained particle distribution withthe smaller particles than 1 µm. The stretching modes of Si-O-Si bound were detected from Fourier transform infrared (FTIR)spectrum. The NCSMAT glass-ceramic is thermally stable from room temperature to 1173 K and the mass loss of the samplein this range is 1.05%. The density was calculated to be 2,751 kg m−3. The relative permittivity at 1 kHz was found to be 85.35. The alternating current conductivity increases with increasing frequency and obeys the universal power law.
Abstract
The Na2O-CaO-SiO2-MgO-Al2O3-TiO2 (NCSMAT) glass-ceramic having the composition of 49 Na2O, 19 CaO, 31 SiO2,0.25 MgO, 0.50 Al2O3 and 0.25 TiO2 (wt.%) was prepared by conventional method. The crystal structure, phase composition,microstructural, chemical, thermal and dielectric properties of the glass-ceramic were investigated. Using the X-ray diffraction(XRD) results, biphasic structure of the glass-ceramic sample was detected, the crystallite size was found to be 13.21 nm forNa4CaSi3O9 phase and 11.02 nm for Na8Al4Si4O18 phase, and the crystallinity percent was calculated to be 86.74 %. Scanningelectron microscope (SEM) observations show that the NCSMAT glass-ceramic has the fine-grained particle distribution withthe smaller particles than 1 µm. The stretching modes of Si-O-Si bound were detected from Fourier transform infrared (FTIR)spectrum. The NCSMAT glass-ceramic is thermally stable from room temperature to 1173 K and the mass loss of the samplein this range is 1.05%. The density was calculated to be 2,751 kg m−3. The relative permittivity at 1 kHz was found to be 85.35. The alternating current conductivity increases with increasing frequency and obeys the universal power law.
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