Abstract
The present article details the formation of lanthanum-modified apatites and the binding process of tartrate ions with these obtained apatites. Chemical analyses, FT-IR and 31P NMR spectroscopies, XRD powder, TGA, and TEM analyses were employed for studying the reaction between Ca 10(PO 4) 6(OH) 2 (HAp) or Ca 10(PO 4) 6(F) 2 (FAp) and LaCl 3. The reaction was found to take place mainly through partial dissolution of the apatite followed by precipitation of a new phase containing lanthanum phosphate. When La 3+ was introduced in the presence of L(+)-tartaric acid (TAH 2), no fundamental changes were observed in the HAp or FAp structures. However, there did occur a formation of a new phase of Ca or/and La tartrate salt.
Published Version
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