caa a22 4500 378915762 CHVBK 20180305123552.0 cr unu---uuuuu 161128e20040801xx s 000 0 eng 10.1524/zkri.219.8.479.38332 doi (NATIONALLICENCE)gruyter-10.1524/zkri.219.8.479.38332 Synthesis, crystal structure and thermal decomposition of potassium-doped carbonated hydroxyapatite [Elektronische Daten] [Tatjana I. Ivanova, Olga V. Frank-Kamenetskaya, Alexander B. Kol'tsov] The well-crystallised polycrystalline sample of the potassium-doped waterless apatite Ca8.40K0.34 · [(PO4)3.15(HPO4)1.30(CO3)]1.55(OH)2 (a = 9.4015(3), c = 6.8985(2) Å, sp.gr. P63/m, Z = 1) with very high carbonate content (7.7 wt% of CO2) has been prepared by the reaction of calcite with KH2PO4 solution under hydrothermal conditions. The Rietveld refinement (Rwp = 0.052) of its crystal structure allowed to find the new orientation of a carbonate triangle. It crosses a PO4 tetrahedron just in its centre so that the positions of a carbon atom coincides with that of a phosphorous atom, and the triangle plane is parallel to the z-axis. The charge disbalance is compensated mainly by the vacancies in the cation sites. The absence of lattice water in the channels is the consequence of the extremely high concentrations of the divalent anions replacing PO4 tetrahedra in the structure. © 2004 Oldenbourg Wissenschaftsverlag GmbH Crystallography nationallicence Inorganic chemistry nationallicence Organic chemistry nationallicence Ivanova Tatjana I. aut Frank-Kamenetskaya Olga V. aut Kol'tsov Alexander B. aut Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 219/8(2004-08-01), 479-486 2194-4946 219:8<479 2004 219 zkri https://doi.org/10.1524/zkri.219.8.479.38332 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/zkri.219.8.479.38332 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ivanova Tatjana I. aut NATIONALLICENCE 700 1- Frank-Kamenetskaya Olga V. aut NATIONALLICENCE 700 1- Kol'tsov Alexander B. aut NATIONALLICENCE 773 0- Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 219/8(2004-08-01), 479-486 2194-4946 219:8<479 2004 219 zkri CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter