Structural Changes of Bioapatite during Heat Treatment

Dallos, Zsolt and Golle-Leidreiter, Philipp and Molnár, Zsombor and Kristály, Ferenc and Kovácsné Kis, Viktória and Dódony, István (2024) Structural Changes of Bioapatite during Heat Treatment. CRYSTAL GROWTH & DESIGN, 24 (5). pp. 2058-2063. ISSN 1528-7483

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Abstract

Bovine bones heated to 1100 °C under air atmosphere were studied using transmission electron microscopy. During heating, bone bioapatite was transformed into hydroxylapatite (HAp). Energy-dispersive spectroscopy did not indicate the presence of A-type CO3 substitution, it showed a near-ideal Ca/P ratio of 1.67 during heating. In the present study, the structure of the formed HAp was determined using automated electron diffraction tomography, a 3D electron diffraction method, space group P63 a = 9.42 Å and c = 6.89 Å at 700 °C. The position of the OH hydrogen sitting in the channel position was determined, confirming the lack of the mirror plane perpendicular to the c-axis in the P63/m space group.

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