The influence of annealing conditions on the Ca/P ratio and phase transformations in bulk calcium phosphates

Abstract

The present study investigates the influence of annealing conditions on phase transformations in calcium phosphates. Synthetic brushite (CaHPO4∙2H2O) with Ca/P ratio 1:1 was taken as a starting material and annealed...

Dissolution–precipitation synthesis and thermal stability of magnesium whitlockite

“…726 and 754 cm −1 , which correspond to the P–O–P bond in β- and α-Ca 2 P 2 O 7 , respectively. 41 The temperature of the formation and the type of the Ca 2 P 2 O 7 polymorph are in good agreement with the XRD results (Fig. 4).…”

Synthesis, structural and luminescent properties of Mn-doped calcium pyrophosphate (Ca2P2O7) polymorphs

“…Finally, the XRD pattern of powders annealed at 1200 °C is in good agreement with XRD data of monoclinic Ca 2 P 2 O 7 (PDF #073-0440) with the P2 1 /n space group (#14). The negligible amount of α-TCP was observed as a neighboring phase, resulting from selective evaporation of phosphate species previously reported in the literature 37 , 40 . Due to the lack of crystallographic data for γ-CPP, Rietveld refinement was employed to calculate lattice parameters only for β- and α-CPP (Figs.…”

A copper-containing analog of the biomineral whitlockite: dissolution–precipitation synthesis, structural and biological properties

“…The formation of α-CPP was confirmed after the thermal treatment at 600 °C and 700 °C. The presence and identification of CPP polymorphs can be easily detected by observing the absorption bands at 726 and 754 cm −1 , 48 since the FTIR spectra of WH and β-TCP do not have any bands in this region. The co-existence of two CPP polymorphs was evident after annealing at 800 °C, while only β-CPP was observed after the thermal treatment at higher temperatures.…”