"Bezdi\u010Dka, Petr" . . "S, Z(AV0Z40320502), Z(MSM0021627501)" . . . "108" . "Structural characterization and thermal behaviour of biological hydroxyapatite"@en . . "RIV/61388980:_____/12:00376288!RIV13-AV0-61388980" . "000302704500022" . "1388-6150" . . . . "Ma\u0159\u00EDkov\u00E1, Monika" . . . . "Svoboda, L." . "Thermal study and structural characterization of biological hydroxyapatite (HA) samples were done as well as their comparison with commercial and synthetic samples in this study. The X-ray micro analyser shows that all three samples of human teeth (HT1-HT3) contain two types of HA structures with different crystallite sizes, unlike sample of bovine thigh-bone (BTB). The bone sample was composed only of one HA phase with varied porosity. The molar Ca/P ratio in biological samples was lower compared to theoretical ratio for pure HA; moreover, in the case of teeth, Ca/P ratio varyies between the centre and the periphery of the cross-sectional samples. Thermogravimetry of the biological samples showed mass decreases-three regions for the bone and four regions for the teeth. In comparison, commercial HA has only two-step weight loss and synthetic HA three-step weight loss. After the calcination up to 1280 degrees C all the samples of teeth transformed into whitlockite, beta-(Ca,Mg)(3)(PO4)(2) (98 wt%) and 2 wt% HA. Besides, HT3 contained further trace amount of hilgenstockite (HIL, Ca4P2O9). The sample BTB partly transited from natural HA into HIL (6 wt%) and lime, CaO (14 wt%). X-ray powder diffraction (XRD) proved occurrence of HIL (9 wt%) beside stability part HA (91 wt%) in the commercial HA after thermal treatment but the synthetic HA composed from Ca-3(PO4)(2) (74 wt%) and HA (26 wt%)."@en . "Structural characterization and thermal behaviour of biological hydroxyapatite" . "[06F74DEC28D0]" . "HU - Ma\u010Farsko" . "1" . . . . "Honcov\u00E1, P." . . "10.1007/s10973-011-1942-6" . . . "Kohutov\u00E1, A." . . . "hydroxyapatite; hard tissues; X-ray powder diffraction; scanning electron microscope; thermal analysis; mass spectrometry"@en . "Journal of Thermal Analysis and Calorimetry" . "2"^^ . . "Structural characterization and thermal behaviour of biological hydroxyapatite" . "171811" . "Thermal study and structural characterization of biological hydroxyapatite (HA) samples were done as well as their comparison with commercial and synthetic samples in this study. The X-ray micro analyser shows that all three samples of human teeth (HT1-HT3) contain two types of HA structures with different crystallite sizes, unlike sample of bovine thigh-bone (BTB). The bone sample was composed only of one HA phase with varied porosity. The molar Ca/P ratio in biological samples was lower compared to theoretical ratio for pure HA; moreover, in the case of teeth, Ca/P ratio varyies between the centre and the periphery of the cross-sectional samples. Thermogravimetry of the biological samples showed mass decreases-three regions for the bone and four regions for the teeth. In comparison, commercial HA has only two-step weight loss and synthetic HA three-step weight loss. After the calcination up to 1280 degrees C all the samples of teeth transformed into whitlockite, beta-(Ca,Mg)(3)(PO4)(2) (98 wt%) and 2 wt% HA. Besides, HT3 contained further trace amount of hilgenstockite (HIL, Ca4P2O9). The sample BTB partly transited from natural HA into HIL (6 wt%) and lime, CaO (14 wt%). X-ray powder diffraction (XRD) proved occurrence of HIL (9 wt%) beside stability part HA (91 wt%) in the commercial HA after thermal treatment but the synthetic HA composed from Ca-3(PO4)(2) (74 wt%) and HA (26 wt%)." . "Structural characterization and thermal behaviour of biological hydroxyapatite"@en . "RIV/61388980:_____/12:00376288" . . "8"^^ . . . "5"^^ .