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. 2016 Apr 14;6:24305. doi: 10.1038/srep24305

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Representative TEM images of flame-made HAp nanoparticles upon sintering for 1 h at (a) 550 °C, (b) 850 °C and (c) 1050 °C. The (d) XRD patterns, (e) FTIR spectra, (f) particle size (d_BET), crystal size (d_XRD) and CaO content of HAp nanoparticles as a function of the sintering temperature.