Abstract
Thermal properties of a recently-developed lead-barium-aluminum phosphate glass were examined by means of differential thermal analysis (DTA) and thermal mechanical analysis (TMA). DTA curve shows that the melting of the crystalline phases (devitrified phases) appears at 891 ± 3°C. The glass transition temperature, softening temperature and thermal expansion coefficient obtained from TMA are 528 ± 3°C, 565 ± 3°C and (11.7 ± 0.4) × 10−6/°C (30°C < T < 520°C), respectively. Infrared spectra were measured on samples of the glass to investigate the structure of the glass. The infrared spectrum of the glass has an absorption band due to water in the near-infrared region, the absence of a characteristic PO absorption band at around 1280 cm−1 in the mid-infrared region, and three well-resolved absorption bands at 403 ± 10, 124 ± 7, 115 ± 5 cm−1 in the far-infrared region.
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