This paper describes a comparative investigation into the in vitro solubility of the calcium polyphosphates, γ-Ca(PO_3)_2 and β-Ca(PO_3)_2. The differing arrangement of their polyphosphates chains appears to result in significant dissolution of γ-Ca(PO_3)_2 polymorph over the β-Ca(PO_3)_2 polymorph, which exhibits limited dissolution. These properties are discussed with respect to structure and thermodynamic stability.
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