Phase Relationship in System 3CaO·P<SUB>2</SUB>O<SUB>5</SUB>–MgO–SiO<SUB>2</SUB>
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The phase relationship in the system 3CaO·P<SUB>2</SUB>O<SUB>5</SUB>–MgO–SiO<SUB>2</SUB> was investigated by a cooling experiment in the usual manner. The system 3CaO·P<SUB>2</SUB>O<SUB>5</SUB>–MgO, a side of this triangle, is a simple binary one, its eutectic being located at the composition of 4∼7% by weight of magnesia and 1570±20°C. The system 3CaO·P<SUB>2</SUB>O<SUB>5</SUB>–2MgO·SiO<SUB>2</SUB> is not binary over the temperature of about 1350°C, below which it is considered as binary. Above 1350°C, nagelschmidtite is formed over the whole composition range and crystallized primarily from liquid at a high 3CaO·P<SUB>2</SUB>O<SUB>5</SUB> portion. The minimum liquidus temperature is 1394°C, which is located at the composition of 70% C<SUB>3</SUB>P and 30% M<SUB>2</SUB>S. The system 3CaO·P<SUB>2</SUB>O<SUB>5</SUB>–MgO–2MgO·SiO<SUB>2</SUB> was considered to be complex owing to the presence of nagelschmidtite, but the eutectic among their three components is located at the composition of 70% 3CaO·P<SUB>2</SUB>O<SUB>5</SUB>, 21% MgO, and 9% SiO<SUB>2</SUB>, and 1362±5°C.<BR>From the results described above and from those of the author’s previous reports, the preliminary phase diagram of the system 3CaO·P<SUB>2</SUB>O<SUB>5</SUB>–MgO–SiO<SUB>2</SUB> was constructed. In this diagram the problem that nagelschmidtite is formed in the composition range which is rich in 3CaO·P<SUB>2</SUB>O<SUB>5</SUB> was not mentioned in detail. In addition to this, it was found by X-ray examination that β-tricalcium phosphate may be apparently stabilized at a higher temperature than β-α transition point, and has the appearance of dissolving magnesia component.
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