Physico-mechanical and morphological features of zirconia substituted hydroxyapatite nano crystals

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Abstract

Zirconia doped Hydroxyapatite (HAP) nanocrystals [Ca 10 (PO 4) 6â 'x (ZrO 2) x (OH) 2 ]; (0 ≤ x ≤ 1 step 0.2) were synthesized using simple low cost facile method. The crystalline phases were examined by X-ray diffraction (XRD). The crystallinity percentage decreased with increasing zirconia content for the as-synthesized samples. The existence of zirconia as secondary phase on the grain boundaries; as observed from scanning electron micrographs (FESEM); resulted in negative values of microstrain. The crystallite size was computed and the results showed that it increased with increasing annealing temperature. Thermo-gravimetric analysis (TGA) assured the thermal stability of the nano crystals over the temperature from room up to 1200 °C depending on the zirconia content. The corrosion rate was found to decrease around 25 times with increasing zirconia content from x = 0.0 to 1.0. Microhardness displayed both compositional and temperature dependence. For the sample (x = 0.6), annealed at 1200 °C, the former increased up to 1.2 times its original value (x = 0.0).

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Mansour, S. F., El-Dek, S. I., & Ahmed, M. K. (2017). Physico-mechanical and morphological features of zirconia substituted hydroxyapatite nano crystals. Scientific Reports, 7. https://doi.org/10.1038/srep43202

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