Sur l'existence des composés P4Sex(x &([a-z]+); 3) et P4Se3−nSn(n = 1,2)

Abstract

The phase diagram of P(red) + P4Se3 was studied systematically by differential thermal analysis and X-ray crystallography. P4Se3, which is the sole binary compound in the system, exists as three allotropic forms: P4Se3α transforms at 82 °C into P4Se3β which is transformed at 192 °C into P4Se3γ; the β- and γ- forms were unknown. The heats of the allotropic transformations were evaluated as well as the heat of fusion of P4Se3.In the ternary diagram P–S–Se the isopleth P4Se3–P4S3 is a quasi-binary section. An eutectic is observed at 170 °C with a concentration of 5% in P4Se3. No mixed compound of the type P4Se3−nSn (n an integer = 1 or 2) was found during the study of this isopleth. [Journal translation]