Abstract
Results of this study have shown the feasibility of FT-IR absorption spectra (between 500 and 700 cm<sup>−1</sup>) for the quantitative determination of the nucleation and crystal growths of sphene (CaTiOSiO<sub>4</sub>) and wollastonite (β-CaSiO<sub>3</sub>) in two separate typical ceramic frits that have been annealed between 800 and 1000°C. Synthetic sphene ceramics and natural wollastonite, both of high purity and excellent crystallinity, serve as standard materials for calibration by the classical least-squares method (Basic Quant), employing the peaks of a sharp band at 561-566 cm<sup>−1</sup> assigned to the SiO<sub>4</sub> vibration and that of a shoulder (676 cm<sup>−1</sup>) of a broad band assigned to TiO<sub>6</sub> vibrations. The correlation coefficients for these calibrations (absorbance vs. concentration of crystalline phase) are given as 0.9964, 0.9936, and 0.9937, respectively. Between annealing temperatures of 850 and 1000°C, both sphene and wollastonite phases appear to grow steadily in frit-S and frit-W, when the highest value of crystal growth is noted for specimens annealed at 1000°C, being approximately 80 wt % and 66 wt % of the formulated content, respectively. Scanning electron micrographs provide pictorial evidence to show that quantitative characterization of crystalline phase growth in ceramic frits by FT-IR absorption spectra is an appropriate technique.
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