Structural and Chemical Characterization of Lanthanum-Doped Fluoroapatite Compounds Synthesized Via Solid-State Reaction

This study focuses on the synthesis and characterization of lanthanum-doped fluorapatite compounds, Pb(۸-x)Na۲Lax(PO۴)۶Fx, with varying lanthanum content (𝑥=۰.۰; ۰.۵; ۱.۰; ۱.۵; ۲.۰). The compounds were synthesized using a solid-state reaction method at ۸۵۰°C and for ۵۰ hours. The X-ray diffraction results confirmed the formation of a highly crystalline hexagonal apatite structure with phase purity in all the synthesized compositions. The calculated lattice parameters (a and c) and unit cell volume (V) decreased systematically for higher lanthanum contents, suggesting successful incorporation of the lanthanum ions into the lattice. Characteristic vibrational modes of phosphate groups (PO۴۳-) are evident in the FTIR spectra, with minor shifts in peak positions due to substituted lanthanum cations. The results agree with what has been reported in the literature and confirm the structural integrity and chemical purity of the synthesized materials. The findings show that the primary apatitic structure could be retained in the case of lanthanum-doped fluorapatite compounds. Still, the material could have better or improved properties to tailor the same for various technological functions such as catalysis, ion exchange, and biomedical engineering. This work provides a sound underpinning to explore further the functional properties and alternative synthesis routes toward optimized material performance.

کلیدواژه ها:

Material ، apatite ، Sodium ، Lanthanum ، Solid Solution ، Fluoride