Abstract
Hydroxyapatite is an essential material for bone and dental composition, widely used in biomaterials due to its biocompatibility and bioactivity. Its crystalline structure, similar to human bone, facilitates integration with biological tissues, promoting bone and dental regeneration. Applications include implants, orthopedic coatings, and bone grafts. The aim of this work was to synthesize hydroxyapatite with different percentages of lithium fluoride by aqueous precipitation. The produced powders were sintered at 1100 °C, and their properties were characterized by XRD, FTIR, and SEM. The results indicated the presence of fluorapatite and calcium oxide phases in the hydroxyapatite with lithium fluoride, with ion substitution occurring, while samples without LiF addition revealed the presence of hydroxyapatite and calcium oxide phases. SEM images showed that the samples with LiF addition exhibited morphological anisotropy, while pure hydroxyapatite samples showed equiaxed grains. The addition of LiF reduced the porosity of the samples after sintering. FTIR results indicated that fluoride ions replaced the hydroxyl groups originally present in the pure hydroxyapatite structure.
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