Strontium is one of metallic elements found in bones and teeth. It is an essential substance in preventing osteoporosis and has the ability to regenerate, preserve, and even restore bone growth. Synthesizing Sr-doped HA powder is of great importance accordingly. Here we present Sr-doped HA powders prepared via sol-gel procedure using calcium nitrate and diammonium hydrogen phosphate as the precursors. Strontium nitrate was used as the dopant source, and its concentration was varied from 2~15 %. An ammoniacal solution was heated until a white gel was obtained. The obtained gel was then dried and subsequently subjected to 900°C calcination. Characterization on the obtained powder was conducted using XRD, FTIR, and FESEM. XRD measurement had shown that the powder contained hydroxyapatite phase only. Morphological evaluation by FESEM measurement shows that the particles of the Sr -doped HA agglomerates are globular in shape with an average size of 1-2 µm in diameter. Meanwhile, the primary particles have a diameter of 50-150 nm in average. It is likely Sr has played an important role as a calcination or sintering additive, causing more progressive densification of particles.

Hydroxyapatite (HA) powders were synthesized using eggshell waste through hydrothermal method to develop bioceramics materials for medical applications. The effects of the pH conditions during the synthesis on the phase behaviour, crystallite size, crystallinity and morphology of as-synthesized ceramic powders were evaluated. The XRD patterns showed that HA was only the main phase present in the as-synthesized powder after being calcined at 400°C. However, EDX measurement detected the presence of Mg as trace elements which originated from the eggshell as starting materials. The crystallite size and crystallinity of the HA powders were increased when the powders were synthesized in acidic condition as compared to basic condition.  FESEM images showed that HA powder with nano-sized rods and spherical morphologies were obtained from the powders that were synthesized at pH 5, while the powder particles synthesized at basic condition at pH 9 produced elongated rod-shape particles. The PSD results showed that the synthesized HA were in agglomerated form which were also confirmed by FESEM images.

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