"Post-hydrogenation" structural transformations from KHg2- to Fe2P-type in R(Cu,Ni)2 hydrides (R = Ce, Pr, Nd)

A.B. RIABOV, Physico-Mechanical Institute of National Academy of Sciences of Ukraine, R.V. DENYS, R. ČERNÝ, I.Yu. ZAVALIY, Physico-Mechanical Institute of National Academy of Sciences of Ukraine, Laboratory of Crystallography, University of Geneva, Physico-Mechanical Institute of National Academy of Sciences of Ukraine
2010 Chemistry of Metals and Alloys  
Hydrogenation of orthorhombic KHg 2 -type R(Cu,Ni) 2 pseudobinary intermetallic compounds (R = Ce, Pr, Nd) was found to lead to the formation of an orthorhombic insertion-type hydride, which readily transforms into a hexagonal Fe 2 P-type hydride. This "post-hydrogenation" structural transformation can be accelerated by heating in vacuum at 100-120°°°°C and is accompanied by release of ¼ of the available hydrogen, as has been confirmed by PND studies. Further heating in vacuum leads to
more » ... tionation of the hydride and recombination with recovery of the orthorhombic R(Cu,Ni) 2 compound after complete elimination of hydrogen from the material. Metal hydrides / Crystal structure / X-ray diffraction / Powder neutron diffraction
doi:10.30970/cma3.0155 fatcat:nx6tahxpdrb5toxmxu2dokbedu