2CaO・SiO₂各変態の標準試料の合成と確認

抄録

The object of this research is to synthesize the crystaly pure crystals of the 2CaO⋅SiO₂ modifications and to certificate them by the way to explain results of X-ray analysis. The following method were most suitable for synthesis of each modification.
(1) γC₂S: The mixture of CaCO₃ and silica gel, charged in theoretical ratio, was fired at 1550°C for 1hr in Pt crucible and then cooled down for dusting.
(2) βC₂S: γC₂S was re-heated up to 1000°C and then cooled down to the room temperature.
(3) α′ C₂S: 4.5 weight % of B₂O₃ were added to the mixture (1). And then this mixture was heated at 1550°C for 1hr. in Pt crucible and cooled down rapidly.
(4) αC₂S: 5.0 weight % of P₂O₅ were added to the mixture (1). And then this mixture was heated at 1550°C for 1hr. and cooled down rapidly.
The X-ray diffraction patterns of the specimens thus obtained were exactly indexed as the function of the following lattice constants. Thus the lattice constants and the spacing of the 2CaO⋅SiO₂ crystals given in this paper seem to be of very high accuracy