Shynthesis and characterization of wollastonite glassceramics prepared from cullet doped with samarium oxide
Wollastonite (CaSiO3) based glass ceramics doped with various amounts of samarium oxide (Sm2O3) were prepared using a melt-quenching technique based on the empirical formula [(CaO)0.21(SLS)0.79]1-y(Sm2O3)y, y=(0,1,2,3,4,5) wt.%. The effect of different sintering temperatures on physical, optical...
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| Format: | Thesis |
| Language: | English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/76715/1/FS%202018%2060%20-%20IR.pdf http://psasir.upm.edu.my/id/eprint/76715/ |
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| Summary: | Wollastonite (CaSiO3) based glass ceramics doped with various amounts of
samarium oxide (Sm2O3) were prepared using a melt-quenching technique based on
the empirical formula [(CaO)0.21(SLS)0.79]1-y(Sm2O3)y, y=(0,1,2,3,4,5) wt.%. The
effect of different sintering temperatures on physical, optical and structural
properties of wollastonite (CaSiO3) based glass-ceramics were investigated for its
potential application as a building material. In this work, soda lime silica glass waste
was utilized as a source of silicon. The chemical composition and physical properties
of glass were characterized by using Energy Dispersive X-ray Fluorescence (XRF)
and Archimedes principle. The Archimedes measurement results show that the
density increased with the increase of sintering temperature and doping Sm2O3
concentration. The generation of CaSiO3, morphology, size and crystal phase with
increasing the heat-treatment temperature was examined by field emission scanning
electron microscopy (FESEM), X-ray diffraction (XRD) and Fourier transform
infrared reflection spectroscopy (FTIR). The average calculated crystal size gained
from XRD was found to be in the range 60 nm. XRD results show that after the
sintering at 700 °C, the sample still in the amorphous phase. The increasing of
sintering temperature to 800 °C cause the nucleation of triclinic wollastonite
(CaSiO3), through increasing the sintering temperature to 900 ⁰C, para wollastonite
(β-CaSiO3) phase appeared, and the progression of sintering temperature above 1000
⁰C improved almost of the positions and relative intensities of the crystalline peaks.
The FESEM results show a uniform distribution of particles and the morphology of
the wollastonite crystal is granular. FTIR results exhibited the structural evolution of
wollastonite based glass ceramics. The appearance of CaO, SiO2, and Ca-O-Si bands
disclosed from FTIR which showed the formation of CaSiO3 crystal phase. In
addition to the calculation of the energy band gap which found to be increased from
3.96 eV to 4.1 eV with increasing sintering temperature, also increased from 4.1 eV
to 4.9 eV with increasing of samarium oxide concentration. |
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