Influence of Sr2+ on Calcium-Deficient Hydroxyapatite Formation Kinetics and Morphology in Partially Amorphized α-TCP

Hydration of partially amorphized α‐TCP powders with Sr2+ concentrations ranging from 0 to 10 mol% substitution for Ca2+ was analyzed by isothermal calorimetry and quantitative in‐situ XRD. Hydration of both crystalline α‐TCP and amorphous TCP (ATCP) forming CDHA was retarded to an increasing extent...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2016-03, Vol.99 (3), p.1055-1063
Main Authors: Hurle, Katrin, Neubauer, Juergen, Goetz-Neunhoeffer, Friedlinde
Format: Article
Language:English
Online Access:Get full text
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Summary:Hydration of partially amorphized α‐TCP powders with Sr2+ concentrations ranging from 0 to 10 mol% substitution for Ca2+ was analyzed by isothermal calorimetry and quantitative in‐situ XRD. Hydration of both crystalline α‐TCP and amorphous TCP (ATCP) forming CDHA was retarded to an increasing extent with increasing Sr2+ content. Sr2+ slightly reduced the crystallite size (XRD coherent scattering domains) of the CDHA formed during hydration, while the size of crystals visible under SEM was not noticeably affected. Reaction enthalpies of ΔHR(Sr‐α‐TCP→Sr‐CDHA) = 122 ± 8 J/gTCP and ΔHR(Sr‐ATCP→Sr‐CDHA) = 257 ± 8 J/gTCP were determined for the hydration of crystalline α‐TCP and ATCP containing 5 mol% Sr2+ substitution for Ca2+. This is comparable with the corresponding reaction enthalpies previously obtained for undoped samples, which are 106 ± 7 J/gTCP for α‐TCP and 250 ± 7 J/gTCP for ATCP.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.14005