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Calciumphosphat‐Keramiken mit einer Oberfläche aus Natrium‐reichen Calciumphosphat‐Phasen
Author(s) -
Zyman Z.,
Epple M.,
Goncharenko A.,
Rokhmistrov D.
Publication year - 2013
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.201300095
Subject(s) - calcium , solubility , chemistry , phosphate , calcium nitrate , sodium , aqueous solution , sodium nitrate , nuclear chemistry , ceramic , inorganic chemistry , precipitation , mineralogy , organic chemistry , physics , meteorology
Calcium phosphate was prepared by aqueous wet‐chemical precipitation from sodium phosphate and calcium nitrate under standard conditions. By incomplete removal of the mother liquor, the by‐product sodium nitrate remained in the dried powder. Upon annealing at 1150°C, the sodium‐rich phases β‐rhenanite (NaCaPO 4 ) and Na 3 Ca 6 (PO 4 ) 5 were formed. If the powder was first compacted and then annealed at 1150°C, the sodium‐rich phases were enriched in the sample surface up to a depth of about 140 μm as shown by X‐ray powder diffraction. As these phases have a higher water solubility than sintered hydroxyapatite, they will enhance the resorption of such a ceramic in contact with hard tissues.