2026-08-06T05:20:42Z https://icatplus.esrf.fr/oaipmh/request

oai:icatplus.esrf.fr:inv/2439206516 2026-07-20T06:00:27.423Z

4.2 EI 10.15151/ESRF-ES-2439206516 Debojit PAUL Debojit Paul 0000-0003-0781-9791 Oliver JESKE Oliver Jeske 0009-0007-9879-8418 Jannik MARRIS Jannik Marris 0009-0004-7162-5689 Jannik MARRIS Jannik Marris 0009-0004-7162-5689 Oliver JESKE Oliver Jeske 0009-0007-9879-8418 Debojit PAUL Debojit Paul 0000-0003-0781-9791 Denis GEBAUER Denis Gebauer 0000-0003-1612-051X AUSTIN HUBLEY Austin Hubley 0000-0001-6326-1951 Example Institute 2029 Data from large facility measurement 2026-07-17T06:00:00Z/2026-07-20T06:00:00Z 2026-07-20T06:00:00Z I CC-BY-4.0 With this experiment at ID02 we will explore the crystallization and transformations of newly discovered amorphous and metastable calcium orthophosphates (CaPs) yielding hydroxyapatite (HAP). As the main constituent of bones and teeth, HAP is among the most thoroughly investigated minerals, however, the precise mechanisms underlying its formation do remain debated. Especially the role of hydrogen phosphate-based intermediates at near-neutral pH, which have only been reported recently, remains unclear. At ID02, WAXS/SAXS measurements will resolve the transformation pathways of these and other metastable phases under controlled pH and temperature conditions. Special attention will thereby be paid to changes in crystal structures, shape and polydispersity of the particles during their transformation into HAP. The results will clarify the role of intermediates in HAP formation, and advance the understanding of CaP transformation pathways at conditions relevant for the formation of bone.