Abstract
Three types of biomaterials based on hydroxyapatite are synthesized and investigated. Hydroxyapatite nanocrystals or microcrystals precipitated from low-temperature aqueous solutions serve as the initial material used for preparing spherical porous granules approximately 300–500 μm in diameter. Sintering of hydroxyapatite crystals at a temperature of 870°C for 2 h or at 1000°C (for 3 h) + 1200°C (for 2 h) brings about the formation of solid ceramics with different internal structures. According to the electron microscopic data, the ceramic material prepared at 870°C is formed by agglomerated hydroxyapatite nanocrystals, whereas the ceramics sintered at 1200°C (with a bending strength of the order of 100 MPa) are composed of crystal blocks as large as 2 μm. It is established that all the biomaterials have a single-phase composition and consist of the hydroxyapatite with a structure retained up to a temperature of 1200°C.
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Dedicated to the 60th Birthday of M. V. Kovalchuk
Original Russian Text © E.I. Suvorova, V.V. Klechkovskaya, V.F. Komarov, A.V. Severin, I.V. Melikhov, P.A. Buffat, 2006, published in Kristallografiya, 2006, Vol. 51, No. 5, pp. 939–946.
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Suvorova, E.I., Klechkovskaya, V.V., Komarov, V.F. et al. Electron microscopy of biomaterials based on hydroxyapatite. Crystallogr. Rep. 51, 881–887 (2006). https://doi.org/10.1134/S1063774506050191
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DOI: https://doi.org/10.1134/S1063774506050191