Calorimetry investigations of milled α-tricalcium phosphate (α-TCP) powders to determine the formation enthalpies of α-TCP and X-ray amorphous tricalcium phosphate.
作者： Katrin Hurle , Juergen Neubauer , Marc Bohner , Nicola Doebelin , Friedlinde Goetz-Neunhoeffer
DOI: 10.1016/J.ACTBIO.2015.05.026
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摘要: One α-tricalcium phosphate (α-TCP) powder was either calcined at 500°C to obtain fully crystalline α-TCP or milled for different durations powders containing various amounts of X-ray amorphous tricalcium (ATCP). These between 0 and 71wt.% ATCP up 2.0±0.1wt.% β-TCP as minor phase were then hydrated in 0.1M Na2HPO4 aqueous solution the resulting heat flows measured by isothermal calorimetry. Additionally, evolution composition during hydration determined situ XRD combined with G-factor method, an external standard method which facilitates indirect quantification phases. Maximum reached after about 1h, while that occurred 4 11h, depending on content. An enthalpy formation -4065±6kJ/mol (T=23°C) calculated (Ca3(PO4)2), (α-Ca3(PO4)2) a value -4113±6kJ/mol determined.
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