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The influence of foreign ions on the crystal lattice of hydroxyapatite upon heating
Author(s) -
Zyman Z.,
Rokhmistrov D.,
Ivanov I.,
Epple M.
Publication year - 2006
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200600032
Subject(s) - stoichiometry , lattice constant , ion , crystal structure , ammonium carbonate , lattice (music) , chemistry , crystal (programming language) , aqueous solution , thermal decomposition , inorganic chemistry , materials science , analytical chemistry (journal) , mineralogy , crystallography , diffraction , chromatography , organic chemistry , physics , programming language , computer science , acoustics , optics
The influence of foreign ions on the crystal lattice of hydroxyapatite (precipitated from aqueous solution by a conventional method at 96 °C with a given ratio of Ca/P=1.67:1) was studied during heating in air in the temperature range of 25‐1250 °C. The lattice constants decreased to those of stoichiometric hydroxyapatite by a complex dependence during heating. This dependence was correlated to a simultaneous release of gaseous products. These products resulted from the decomposition of foreign ions which were incorporated into the hydroxyapatite lattice during precipitation, i.e. ammonium, nitrate and carbonate. Stoichiometric hydroxyapatite with correct lattice constants was obtained at 1100 °C. Further heating to 1250 °C resulted in only minor changes in the lattice characteristics.