珪酸石灰の研究 (第2報) 微構造
1934 年 42 巻 497 号 p. 304-313
詳細
1934 年 42 巻 497 号 p. 304-313
Experiments have been made of microstructure and refractive indices of the synthetic products described in Part 1 with the following results:
(1) The 3CaO.SiO2 samples prepared at 1800°C are pure analytically as well as optically. However they contain minute proportions of β 2CaO.SiO2 type crystals.
(2) The 2CaO.SiO2 sample prepared at 1700°C consists solely of α type. It is likely that β→γ inversion of the silicate takes place more suddenly than α→β.
(3) The 3CaO.2SiO2 samples prepared at temperatures varying from 1450° to 1475°C seem to be composed of 3CaO.2SiO2 (or α CaO.SiO2), γ 2CaO.SiO2 and α 2CaO.SiO2, although they are almost pure 3CaO.2SiO2 analytically.
(4) The CaO.SiO2 sample prepared at 1500°C is almost pure α CaO.SiO2⋅α CaO.SiO2 crystals are not optically biaxial and positive, but are optically uniaxial and negative, their refractive indices being ωD=1.650 and εD=1.610.
(5) The results of the observations of those samples which were prepared at temperatures lower than the maxima but higher than 900°C agree very well with the results of the synthetic experiments given in Part 1.
(6) All compound prepared at temperatures under 1500°C, especially at 1300° to 1400°C, are apt to dust.
