Synthesis and Structures of [Sr2−xEux]IrH5, [Sr2−xEux]RhH5, [Ca2−xEux]IrH5, and Eu2RhH5

摘要: Abstract Samples of various compositions [Sr 2− x Eu ] M H where = Rh or Ir and [Ca ]IrH 5 were synthesized from stoichiometric mixtures EuH 2 , SrH CaH powders in a hydrogen atmosphere at 700°C. Powder X-ray diffraction data the black single-phase products indexed on basis face-centered cubic lattice. The variations unit cell parameters as function consistent with Vegard's Rule for 0 ≤ range. increased decreasing between limits 7.580 7.651 A 7.557 approximately 7.60 A° ]RhH . Unit 7.297 to went 0.25 estimated standard deviation is 0.001 A. crystal structures belonged Fm 3 m (No. 225) space group random occupancy Sr Ca 8 c sites, ions located 4 24 e sites. formation RhH also reported. this new ternary hydride FCC length equal 7.555