Compositional Range of the Glass Formation in the System Shirasu Volcanic Glass (SVG)-CaO-MgO and Some Properties of the Glass in this System

• Published in: Journal of the Ceramic Association, Japan Vol. 89; no. 1035; pp. 626 - 628
• Main Authors: SHIMADA, Kinji, FUKUSHIGE, Yasuo, KOJO, Kazunori, RUSU, Shigeto
• Format: Journal Article
• Language: Japanese
• Published: The Ceramic Society of Japan 01.11.1981
• Subjects: Resistance to alkaline solution; SVG-CaO-MgO glass; Volcanic glass in Shirasu (SVG)
• ISSN: 0009-0255; 1884-2127
• DOI: 10.2109/jcersj1950.89.1035_626

As Shirasu volcanic glass (SVG) has a fixed chemical composition, SVG was assumed to be a component and experiments were made on the system SVG-CaO-MgO. The batches of the system were heated at 1400°C and 1500°C and quenched into cold water. The compositional ranges of glass formation in the system were obtained. When the glasses were reheated at 1100°C for 1h, and akermanite, diopside and forsterite crystals precipitated from the glasses. The glasses showed high resistance to alkaline solution: namely the mean weight loss of the glasses which had been treated by 2N NaOH solution at 100°C for 14h was so small as to be 0.7%.