High-pressure phases of plutonium monoselenide studied by X-ray diffraction
Plutonium monoselenide was studied under high pressure up to 47 GPa, at room temperature, using a diamond anvil cell in an energy dispersive X-ray diffraction facility. At ambient pressure, PuSe has the NcCl-type (B1) structure. The compound undergoes a second-order crystallographic phase transition at around 20 GPa. This phase can be described as a distorted B1 structure, with a rhombohedral symmetry. PuSe transforms to a new phase at around 35 GPa, which can be indexed in the cubic CsCl-type (B2). The volume collapse at this phase transition is 11%. When releasing pressure, a strong hysteresis to the inverse transformation down to 5 GPa was observed. From the pressure-volume relationship, the bulk modulus was determined as B(0)=98 GPa and its pressure derivative as B'(0)=2.6. These results are compared to those obtained with other actinide mononictides and monochalcogenides.
Bibliographic Reference: Article: High Pressure Research, Vol. 2 (1990) pp. 347-359
Record Number: 199110325 / Last updated on: 1994-12-02
Original language: en
Available languages: en