Fig. 2
From: Porous hydroxyapatite – β-tricalcium phosphate ceramics produced from a rapid sol-gel process

(a) The XRD patterns of Ac3-10 and Nit3-10 after heating to 700 °C. (b) Shows the patterns of Nit3-10 between 10–55°, with significant (> 5%) HAp and β-TCP peaks marked.