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The high-pressure crystal structure of the actinide compounds ThX and UX (X = C, N, P, S, As, Se, Sb, Te) was studied by X-ray diffraction using synchrotron radiation, in the pressure range of up to about 60 GPa. Distorted fcc structures were observed for UC (27 GPa), UN (29 GPa), UP (10/28 GPa), US (10 GPa) and ThS (20 GPa). No phase transition was observed for ThC and ThN. Compounds with As, Se, Sb, all transform to the CsCl structure. ThP transforms to the CsCl structure at 30 GPa. ThTe has the CsCl structure at ambient pressure and no further phase transition was observed. UTe transforms to the CsCl structure at 9 GPa.

Additional information

Authors: STAUN OLSEN J, Physics Laboratory, University of Copenhagen, Copenhagen (DK);GERWARD L, Laboratory of Applied Physics, Technical University of Denmark, Lyngby (DK);BENEDICT U, JRC Karlsruhe (DE);DABOS-SEIGNON S, Institut Curie, Paris (FR);ITIÉ J-P, C.N.R.S., Villetaneuse (FR)
Bibliographic Reference: Paper presented: Third Workshop "Actinides Under Pressure", Karlsruhe (DE), July 24-25, 1989
Availability: Available from (1) as Paper EN 35168 ORA
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