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Polymorphism of phosphoric oxide

Journal of the American Chemical Society

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Abstract

The melting points and monotropic relationship of three crystalline forms of phosphoric oxide were determined by the method of quenching. Previous vapor pressure data are discussed and interpreted to establish a pressure-temperature diagram (70 to 600??) for the one-component system. The system involves three triple points, at which solid, liquid and vapor (P4O10) coexist in equilibrium, namely: 420?? and 360 cm., 562?? and 43.7 cm. and 580?? and 55.5 cm., corresponding to the hexagonal, orthorhombic and stable polymorphs, respectively, and at least two distinct liquids, one a stable polymer of the other, which are identified with the melting of the stable form and the hexagonal modification, respectively. Indices of refraction of the polymorphs and glasses were determined. The density and the thermal, hygroscopic and structural properties of the several phases are discussed.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Polymorphism of phosphoric oxide
Series title:
Journal of the American Chemical Society
Volume
65
Issue:
5
Year Published:
1943
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of the American Chemical Society
First page:
794
Last page:
802
Number of Pages:
9