Revision of the low-temperature structures of rhombohedral ZrCr2Dx (x similar to 3.8), and monoclinic ZrV2Dx (1.1 < x < 2.3) and HfV2Dx (x similar to1.9)

The low temperature structures reported for the rhombohedral C14 type deriv ative ZrCr2D3.8, [Irodova & Suard, J. Alloys Comp. 299 (2000) 32-38] and th e monoclinic C15 type derivatives ZrV2Dx (x=2.18, 1.94, 1.48, 1.18) and HfV 2D1.92 [Irodova & Suard, J. Alloys Comp. 291 (1999) 184-189] are found to b e centrosymmetric rather than non-centrosymmetric. New structure refinement s based on the original neutron diffraction data collected at 100 K yield m ore consistent results and significantly different deuterium atom distribut ions. (C) 2000 Elsevier Science S.A. All rights reserved.