| 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. |
| Genre: | Article |
| ProdID: | 70010951 |
| Citation Author: | Hill, W. L.; Faust, G. T.; Hendricks, S. B. |
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| Citation End Page: | 802 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of the American Chemical Society |
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| Citation Number Of Pages: | 9 |
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| Citation Search Results Text: | Polymorphism of phosphoric oxide; 1943; Article; Journal; Journal of the American Chemical Society; Hill, W. L.; Faust, G. T.; Hendricks, S. B. |
| Citation Start Page: | 794 |
| Citation Volume: | 65 |
| Citation Year: | 1943 |
| Type: | citation/reference |
| Text: | Polymorphism of phosphoric oxide; 1943; Article; Journal; Journal of the American Chemical Society; Hill, W. L.; Faust, G. T.; Hendricks, S. B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1943 00:00 -0500 |
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