The sintering behavior of β-tricalcium phosphate [β-TCP, Ca3(PO4)2] was investigate. β-Tricalcium phosphate powders were synthesized by modified wet chemical method – precipitation from aqueous medium by slow addition of orthophosphoric acid solution to a calcium hydroxide suspension [1]. The ending pH value of the suspension was stabilized in the range of 5-7 at ambient temperature. Synthesized powders were uniaxially pressed in cylindrical tablets and sintered at temperatures ranging from 700 to 1300°C for 1 h. The morphology and microstructure, functional group analysis, phase composition and transformation, thermal stability of synthesized and sintered samples were investigate by XRD, FT-IR, FE-SEM, DTA and optical dilatometry. The study shows that the ending pH of precipitation medium considerably influences the composition of synthesized powder, especially hydrogen phosphate (HPO42-) ions content and the hydroxyapatite or calcium pyrophosphate phase formation after sintering. The phase composition significantly affects the physical characteristics of synthesized β-TCP powders, especially microstructure and thermal stability. The highly thermally stable (up to 1300ºC) β-TCP bioceramic can be successfully synthesized by room synthesis temperature and acidic ending pH 5.