Structural changes during the hydrolysis of dicalcium phosphate dihydrate to octacalcium phosphate and hydroxyapatite

2015 ◽  
Vol 51 (4) ◽  
pp. 355-361 ◽  
Author(s):  
V. F. Shamrai ◽  
A. E. Karpikhin ◽  
A. Yu. Fedotov ◽  
V. P. Sirotinkin ◽  
S. M. Barinov ◽  
...  
Keyword(s):  
Structural Changes ◽  
Octacalcium Phosphate ◽  
Dicalcium Phosphate ◽  
Dicalcium Phosphate Dihydrate ◽  
Phosphate Dihydrate ◽  
Hydrolysis Of

EFFECT OF pH, CALCIUM CONCENTRATION AND TEMPERATURE ON THE HYDROLYSIS OF DICALCIUM PHOSPHATE DIHYDRATE

1989 ◽  
Vol 69 (3) ◽  
pp. 689-693 ◽  
Author(s):  
G. W. MORDEN ◽  
G. J. RACZ
Keyword(s):  
Key Words ◽  
Calcium Concentration ◽  
Dicalcium Phosphate ◽  
Dicalcium Phosphate Dihydrate ◽  
Effect Of Ph ◽  
Ph Values ◽  
Phosphate Dihydrate ◽  
Rate Of Hydrolysis ◽  
Hydrolysis Of

The rate of hydrolysis of DCPD to OCP in solutions of different pH values, calcium concentrations and temperatures was studied. Rates of hydrolysis were very slow at pH 6.0, relatively rapid and similar at pH 7.0 and 8.0, much slower at 10 °C than at 20 or 30 °C, and only slightly increased by increasing calcium concentration. Key words: Dicalcium phosphate dihydrate, hydrolysis, pH, temperature, calcium concentration

Hydrolysis of dicalcium phosphate dihydrate in a sodium acetate solution

2012 ◽  
Vol 447 (2) ◽  
pp. 303-305 ◽  
Author(s):  
I. V. Fadeeva ◽  
S. M. Barinov ◽  
D. Ferro ◽  
V. S. Komlev ◽  
L. I. Shvorneva
Keyword(s):  
Sodium Acetate ◽  
Dicalcium Phosphate ◽  
Sodium Acetate Solution ◽  
Acetate Solution ◽  
Dicalcium Phosphate Dihydrate ◽  
Phosphate Dihydrate ◽  
Hydrolysis Of

Seeded Growth of Calcium Phosphates: Effect of Different Calcium Phosphate Seed Material

1976 ◽  
Vol 55 (4) ◽  
pp. 617-624 ◽  
Author(s):  
G.H. Nancollas ◽  
J.S. Wefel
Keyword(s):  
Calcium Phosphate ◽  
Tricalcium Phosphate ◽  
Calcium Phosphates ◽  
Octacalcium Phosphate ◽  
Dicalcium Phosphate ◽  
Dicalcium Phosphate Dihydrate ◽  
Seeded Growth ◽  
Seed Crystals ◽  
Phosphate Dihydrate ◽  
Supersaturated Solutions

The growth of calcium phosphates on seed materials, dicalcium PhosPhate dihydrate (DCPD), tricalcium phosphate (TCP), octacalcium phosphate (OCP), and hydroxyapatite (HAP) in stable supersaturated solutions has been studied under conditions of pH and concentration for which the predominant phases are 1, DCPD, and II, HAP. All seed crystals are good nucleators for DCPD in system I, but, aside from HAP itself, only OCP will readily induce growth under condition II.

scholarly journals REACTION PRODUCTS OF ORTHOPHOSPHATES IN SOILS CONTAINING VARYING AMOUNTS OF CALCIUM AND MAGNESIUM

1967 ◽  
Vol 47 (3) ◽  
pp. 223-230 ◽  
Author(s):  
G. J. Racz ◽  
R. J. Soper
Keyword(s):  
Calcium Phosphate ◽  
Octacalcium Phosphate ◽  
Water Soluble ◽  
Dicalcium Phosphate ◽  
Dicalcium Phosphate Dihydrate ◽  
Reaction Products ◽  
Phosphate Dihydrate ◽  
Soluble Calcium ◽  
Calcium And Magnesium ◽  
Saturated Solutions

The reaction products formed when orthophosphates (pellets) were added to 22 soils, with different calcium and magnesium contents, were identified. Di-calcium phosphate dihydrate (CaHPO4∙2H2O) formed in the soils having a water-soluble calcium to magnesium ratio of approximately 1.5 or greater. Dicalcium phosphate dihydrate and/or dimagnesium phosphate trihydrate (MgHPO4∙3H2O) formed in soils having a water-soluble calcium to magnesium ratio of less than 1.5.Dicalcium phosphate dihydrate and dimagnesium phosphate trihydrate precipitated in filtrates of two dolomitic soils shaken for 15 min with saturated solutions of KH2PO4 and NH4H2PO4. Octacalcium phosphate (Ca4H (PO4)3∙3H2O) and trimagnesium phosphate tetrahydrate (Mg3 (PO4)2∙4H2O) precipitated in filtrates of these soils when saturated solutions of K2HPO4 and (NH4)2HPO4 were used.Trimagnesium phosphate twenty-two hydrate (Mg3 ((PO4)2∙22H2O) formed when dimagnesium phosphate trihydrate was added to a soil containing large amounts of magnesium.

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