Synthesis and structure of [Sr{sub 2-x}Eu{sub x}]IrH{sub 5}, [Sr{sub 2-x}Eu{sub x}]RhH{sub 5}, [Ca{sub 2-x}Eu{sub x}]IrH{sub 5}, and Eu{sub 2}RhH{sub 5}
- Trinity College, Hartford, CT (United States); and others
Samples of various compositions of [Sr{sub 2-x}Eu{sub x}]MH where M=Rh or Ir and [Ca{sub 2-x}Eu{sub x}]IrH{sub 5} were synthesized from stoichiometric mixtures of EuH{sub 2}, SrH{sub 2}, or CaH{sub 2}, and Rh or Ir powders in a hydrogen atmosphere at 700{degrees}C. Powder X-ray diffraction data of the black single-phase products were indexed on the basis of a face-centered cubic lattice. The variations in the unit cell parameters as a function of x were consistent with Vegard`s Rule of 0<2 range. The unit cell parameters increased with decreasing x between the limits of 7,580 and 7.651 {Angstrom} for [Sr{sub 2-x}Eu{sub x}]IrH{sub 5} and between the limits of 7.557 and approximately 7.60 {Angstrom} for [Sr{sub 2-x}Eu{sub x}]RhH{sub 5}. Unit cell parameters increased form 7.297 to 7.580 {Angstrom} as x went from 0.25 to 2 for [Ca{sub 2-x}Eu{sub x}]IrH{sub 5}. The estimated standard deviation for the unit cell parameters is 0.001 {Angstrom}. The crystal structures belonged to the Fm3m (No. 225) space group with random occupancy of Sr or Ca and Eu in the 8c sites, Rh or Ir ions located at the 4a sites, and H in the 24e sites. The formation of Eu{sub 2}RhH{sub 5} is also reported. The X-ray diffraction data for this new ternary hydride were indexed FCC with the cell length equal to 7.555 {Angstrom}.
- OSTI ID:
- 223707
- Journal Information:
- Journal of Solid State Chemistry, Vol. 121, Issue 1; Other Information: PBD: 5 Jan 1996
- Country of Publication:
- United States
- Language:
- English
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