溶融珪酸鉛の表面張力および密度の測定
1967 年 31 巻 2 号 p. 113-119
詳細
1967 年 31 巻 2 号 p. 113-119
The surface tension and density of liquid lead silicate have been measured as accurately as possible in the temperature range from 800° to 1200°C by means of a modified dipping cylinder method and the Archimedean method, respectively. The results obtained are summarized as follows:
The surface tension of liquid lead silicate increases with decreasing content of PbO, and the slope of the curve showing the relation between surface tension and composition changes at about the stoichiometric compositions, 2PbO·SiO2 and PbO·SiO2. The temperature coefficient of surface tension is positive in the composition range of less than about 50 mole%SiO2. However, it becomes negative when the content of SiO2 is more than the above composition range.
The negative deviation from the additivity in molar volume indicates the occurrence of the bond breaking and the production of discrete silicate anions, and minimum values are also found at about 33 and 50 mole%SiO2 in the plots of molar volume and composition.
