Solubility in system NH3-H3PO4-H4P2O7-H5P3O10-H6P4O13-H2O [ammonia-orthophosphoric acid-pyrophosphoric acid-tripolyphosphoric acid-tetrapolyphosphoric acid-water] at 0.deg.

1972 ◽  
Vol 17 (3) ◽  
pp. 317-319
Author(s):  
Thad D. Farr ◽  
Joseph W. Williard
Keyword(s):  
Orthophosphoric Acid ◽  
Acid Water ◽  
Pyrophosphoric Acid

System ammonia-potassium monoxide-orthophosphoric acid-pyrophosphoric acid-water at 25.deg.

1973 ◽  
Vol 21 (4) ◽  
pp. 700-704 ◽  
Author(s):  
A. William Frazier ◽  
Ewell P. Dillard ◽  
Raymond D. Thrasher ◽  
Kjell R. Waerstad
Keyword(s):  
Orthophosphoric Acid ◽  
Acid Water ◽  
Pyrophosphoric Acid

System ammonia-zinc oxide-orthophosphoric acid-pyrophosphoric acid-water at 25.deg.

1975 ◽  
Vol 23 (2) ◽  
pp. 330-334
Author(s):  
A. William. Frazier ◽  
Ewell F. Dillard ◽  
James R. Lehr
Keyword(s):  
Zinc Oxide ◽  
Orthophosphoric Acid ◽  
Acid Water ◽  
Pyrophosphoric Acid

System Ammonia-Pyrophosphoric Acid-Water at 0° and 25° C.

1965 ◽  
Vol 10 (1) ◽  
pp. 20-21 ◽  
Author(s):  
T. D. Farr ◽  
J. D. Fleming
Keyword(s):  
Acid Water ◽  
Pyrophosphoric Acid

The Mechanical Properties and Microstructures of Cement Formed from Pyrophosphoric and Orthophosphoric Acids

2005 ◽  
Vol 284-286 ◽  
pp. 125-128 ◽  
Author(s):  
Liam M. Grover ◽  
Uwe Gbureck ◽  
David Farrar ◽  
J.E. Barralet
Keyword(s):  
Mechanical Properties ◽  
Acid Solution ◽  
Tricalcium Phosphate ◽  
Orthophosphoric Acid ◽  
Marked Change ◽  
Solution Set ◽  
Liquid Ratio ◽  
Setting Times ◽  
Pyrophosphoric Acid ◽  
Orthophosphoric Acid Solution

In this study the setting times, compressive strengths and microstructures of cements formed using pyrophosphoric acid solution and b-tricalcium phosphate (β-TCP; Ca3(PO4)2) were compared with those of cement formed using orthophosphoric acid solution and b-TCP. It was found that cement formed using pyrophosphoric acid solution set more slowly than that formed using orthophosphoric acid and could be mixed to a higher powder to liquid ratio, facilitating the production of cement exhibiting compressive strengths, without pre-compaction, as high as 25 MPa. The use of pyrophosphoric acid as opposed to orthophosphoric acid resulted in a marked change in the microstructure of the cement.

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