Transition of calcium orthophosphate to pyrophosphate at elevated pressures
作者： H. Catherine , W. Skinner
DOI: 10.1016/0025-5408(70)90083-8
关键词: Inorganic chemistry 、 Pyrophosphate 、 Dehydration 、 Transition temperature 、 Calcium orthophosphate 、 Ion 、 Chemistry 、 Mechanical engineering 、 General Materials Science 、 Mechanics of Materials 、 Condensed matter physics
摘要: The equilibrium transition temperature of 2 CaHPO4 ⇄ Ca2P2O7 + H2O was determined as 322.5 ± 2.5°C. at 2000 bars pressure and 342.5 4000 pressure. monetite dehydration is extremely sluggish due to the large structural change anion groups, orthophosphate (PO4′′′) pyrophosphate (P2O7″″). A stersochemical mechanism suggested based on crystallo-graphic investigations.
elsevier.com
sci-hub.se 参考文章(8)
G. Trömel, H. Möller, Die Bildung schwer löslicher Calciumphosphate aus wäßriger Lösung und die Beziehungen dieser Phosphate zur Apatitgruppe Zeitschrift für anorganische und allgemeine Chemie. ,vol. 206, pp. 227- 240 ,(1932) , 10.1002/ZAAC.19322060212
G. M. Biggar, Experimental Studies of Apatite Crystallization in Parts of the System CaO-P2O5-H2O at 1000 Bars Mineralogical Magazine. ,vol. 36, pp. 1110- 1122 ,(1966) , 10.1180/MINMAG.1966.036.276.06
N. C. Webb, The crystal structure of β-Ca2P2O Acta Crystallographica. ,vol. 21, pp. 942- 948 ,(1966) , 10.1107/S0365110X66004225
A. O. McIntosh, W. L. Jablonski, X-Ray Diffraction Powder Patterns of Calcium Phosphates Analytical Chemistry. ,vol. 28, pp. 1424- 1427 ,(1956) , 10.1021/AC60117A019
C. U. Shepard, On two new minerals, monetite and monite, with a notice of pyroclasite American Journal of Science. ,vol. s3-23, pp. 400- 405 ,(1882) , 10.2475/AJS.S3-23.137.400
G. MacLennan, C. A. Beevers, The crystal structure of dicalcium phosphate, CaHPO4 Acta Crystallographica. ,vol. 8, pp. 579- 583 ,(1955) , 10.1107/S0365110X55001795
W. L. Hill, S. B. Hendricks, Composition and Properties of Superphosphate: Calcium Phosphate and Calcium Sulfate constituents as Shown by Chemical and X-Ray Diffraction Analysis Industrial & Engineering Chemistry. ,vol. 28, pp. 440- 447 ,(1936) , 10.1021/IE50316A019
H. C. W. Skinner, X-Ray Diffraction Analysis Techniques to Monitor Composition Fluctuations within the Mineral Group: Apatite Applied Spectroscopy. ,vol. 22, pp. 412- 414 ,(1968) , 10.1366/000370268774384254