Preparation of Uranium Phosphide from Uranium Tetrafluoride

Abstract
A study was made on UP preparation by two-step reactions starting with UF4, Si and red phosphorus. The first step was to produce an intermediate uranium phosphide U3P4 from the reaction of UF4 with Si under phosphorus vapor at temperatures above 900°C. In the second step, the intermediate phosphide was heat treated under vacuum. To obtain single phase UP from the intermediate phosphide, the treatment required a temperature above 1,050°C, at which temperature the minimum holding time was 60 min.

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