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Macroscopic Separation of Dense Fluid Phase and Liquid Phase of Phosphorus

Structural transformation between a dense molecular fluid and a polymeric liquid of phosphorus that occurred at about 1 gigapascal and 1000°C was investigated by in situ x-ray radiography. When the low-pressure fluid was compressed, dark and round objects appeared in the radiograph. X-ray diffractio...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2004-10, Vol.306 (5697), p.848-851
Main Authors: Katayama, Yoshinori, Inamura, Yasuhiro, Mizutani, Takeshi, Yamakata, Masaaki, Utsumi, Wataru, Shimomura, Osamu
Format: Article
Language:English
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Summary:Structural transformation between a dense molecular fluid and a polymeric liquid of phosphorus that occurred at about 1 gigapascal and 1000°C was investigated by in situ x-ray radiography. When the low-pressure fluid was compressed, dark and round objects appeared in the radiograph. X-ray diffraction measurements confirmed that these objects were the high-pressure liquid. The drops grew and eventually filled the sample space. Decompressing caused the reverse process. The macroscopic phase separation supported the existence of a first-order phase transition between two stable disordered phases besides the liquid-gas transition. X-ray absorption measurements revealed that the change in density at the transition corresponds to about 40% of the density of the high-pressure liquid.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1102735