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Phosphorus selenides are a relatively obscure group of compounds. There have been some studies of the phosphorus - selenium phase diagram and the glassy amorphous phases are reported. The compounds that have been reported are shown below. While some are similar to their phosphorus analogues, the phosphorus sulfides, there are some new forms, molecular P2Se5 and the polymeric catena-x. There is also some doubt about the existence of molecular P4Se10.
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