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The crystal structure of cubic iron monosilicide, e-FeSi, has been determined at six pressures between 0 and 8.5 GPa by time-of-flight neutron powder diffraction, using the POLARIS diffractometer at the ISIS spallation neutron source. At all pressures, the material has space group P213, with Z = 4 and both atoms on sites 4(a) (x, x, x). The unusual sevenfold coordination of both atoms is unaltered by pressure, with the atomic coordinates remaining essentially fixed at XFe = 0.137 (1) and Xsi = -0.157 (1) throughout. An almost uniform compression of up to approximately 2% in interatomic distances is observed, owing to the reduction in cell parameter.

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The crystal structures of UVO, [space group Pbcm, a=4.1231(1) A, b=12.3641(1) A, c=7.2071(1) A, Z=4] and Cs, (UO, ), V, O, [space group P2,/a1 a = 10.521(2) A, b=8.4369(9) A, c=7.308(3) A, p= 106.08(1)", Z = 2 ] , previously obtained by single-crystal X-ray diffraction, were refined using powder neutron diffraction and Rietveld analysis adapted to time-of-flight data. The main structural features of the two compounds were confirmed but more accurate oxygen positions are reported here.