Fig. 4From: The usability of ark clam shell (Anadara granosa) as calcium precursor to produce hydroxyapatite nanoparticle via wet chemical precipitate method in various sintering temperatureFTIR spectrum of sintered HA between 200 and 1200 °C for 4 h: a 200 °C, b 600 °C, c 800 °C, d 1000 °C, e 1100 °C, and f 1200 °CBack to article page