Some assignments in the infra-red spectrum of octacalcium phosphate

Synthesis and characterization of hydroxyapatite crystals: A review study on the analytical methods

“…In addition, prior to the onset of HAP precipitation and during the first moments of the process, water presaturated gas nitrogen was bubbled through the , and so forth in the infrared spectra of HAP, as can be seen from Figure 2 and Table V. [46][47][48][49][50] The HAP sample of the third method was also free of monohydrogen phosphate (HPO 4 2− ), as concluded from the infrared spectroscopic data analysis (absence of detectable peaks at wavelengths 868, 875, 1215, 31,46,51,52 or 2400 cm −1 53 ). In the following, a detailed discussion on the spectroscopic and crystallographic analysis will be presented.…”

Crystal and spectroscopic data for SrNaPO4.9H2O and BaNaPO4.9H2O

“…The broad weak bands at 2300 cm -1 are attributed to hydrogen bonding between water molecules and phosphategroup oxygen atoms. The broad weak bands appearing in the 800 to 600 cm-1 region are attributed to water hydrogen bonding (Berry & Baddiel, 1967).…”

Vibrational spectroscopic characterization of new calcium phosphate bioactive coatings

“…3) confirm that strong asymmetric OHO hydrogen bonds are present in the calcium phosphates examined. 36 In the IR spectrum of CaP 1 (R ϭ 0.65) broad absorption bands at ϳ 3420, 2840, and 2400 cm Ϫ1 are present. Analogous broad bands at ϳ 2950 and 2385 cm Ϫ1 were observed by Berry and Baddiel 34 in the IR spectrum of DCPD; the first one can be attributed to the 1 (HPO 4 As the molar ratio increases the absorption between 3300 and 2000 cm Ϫ1 progressively decreases in intensity because of the decrease in HPO 4 2Ϫ content (Fig.…”