Formation of perovskite-type hydrides and thermal desorption processes in Ca-T-H (T=3d transition metals)

Formation abilities of perovskite-type hydrides in Ca1+xT-H, where T= 3d transition metals and x = 0-1.0, were examined. CaNiH3 and CaCoH3 were found to form the cubic perovskite structure. In the former hydride, the maximum amount of Ni vacancy is estimated to be approximately 20%, CaNi0.8H3, using powder neutron diffraction measurements. The thermal desorption processes of CaT-H for T= Fe, Co or Ni were investigated by the relationship between perovskite- and complex-type hydrides. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.