Complex evolution of phase during the thermal investigation of Brushite-type calcium phosphate CaHPO4•2H2O

Tailoring the phosphorus release from biochar-based fertilizers: role of magnesium or calcium addition during co-pyrolysis

“…23 Upon heating, the CaHPO 4 ·2H 2 O was dehydrated to form CaHPO 4 at around 150–160 °C, which further converted into crystalline γ-Ca 2 P 2 O 7 at around 350–550 °C. 50,56…”

“…23 Upon heating, the CaHPO 4 $2H 2 O was dehydrated to form CaHPO 4 at around 150-160 °C, which further converted into crystalline g-Ca 2 P 2 O 7 at around 350-550 °C. 50,56 Apart from Ca 2 P 2 O 7 , other Ca phases may have been present as well, either as amorphous or small amounts of crystalline phases. Examples of phases that were previously observed in biochars prepared under similar conditions were CaHPO 4 , 11,17,36 Ca 3 (PO 4 ) 2 , Ca 8 H 2 (PO 4 ) 6 $5H 2 O, 22 and hydroxyapatite (Ca 10 (OH) 2 (PO 4 ) 6 ).…”

Physico-geometrical kinetic insight into multistep thermal dehydration of calcium hydrogen phosphate dihydrate

“…Therefore, significant efforts have been made to reveal physico-chemical characteristics related to the thermal stability and thermally induced transformations of DCPD under various heating and atmospheric conditions. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Thermal dehydration is a typical physico-chemical phenomenon used to assess the thermal stability and thermally induced transformation properties of DCPD. Thermal dehydration occurs at temperatures slightly higher than the boiling point of water via multistep mass loss steps to form crystalline or amorphous anhydride (CaHPO 4 ; dibasic calcium phosphate anhydride (DCPA)).…”

“…Thermal dehydration occurs at temperatures slightly higher than the boiling point of water via multistep mass loss steps to form crystalline or amorphous anhydride (CaHPO 4 ; dibasic calcium phosphate anhydride (DCPA)). [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Changes in multistep mass loss behavior depending on sample particle morphology, 5,10 heating conditions, 12 and atmospheric water vapor pressure 2,3,13 have been a major subject to reveal the thermal dehydration behavior of DCPD. Changes in the multistep dehydration behavior with sample particle morphology and heating conditions may be explained by considering the physico-geometrical features of the reaction and formation of amorphous DCPA.…”

UMAOH Calcium Phosphate Coatings Designed for Drug Delivery: Vancomycin, 5-Fluorouracil, Interferon α-2b Case

“…XRD results revealed an X-ray amorphous nature of all the MAO coatings, which is confirmed by a pronounced diffusive halo in the range of 2θ = 20-35 • , represented in Figure 6. According to [49,50], different calcium orthophosphates, including amorphous CaP, are situated in the range of 2θ = 20-35 • . The signal of high intensity is registered for the α-Ti phase (ICDD No.…”