| http://www.w3.org/ns/prov#value | - Preparation of tetracalcium phosphate in a furnace: One first prepares a homogenous mixture that has a Ca/P ratio of less than 2, heats the mixture to 1400??? C. or above, and then maintains the sample at that temperature for a sufficiently long period of time, for example 6 hours, to assure as complete conversion as possible of the starting mixture to tetracalcium phosphate.
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