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crystal data
Lattice constants for the superconducting compound Mo3.25Ir have been measured at 293 and at 12.5 K by means of Guinier cameras. The compound has the cubic A15 structure with a = 4.9703(5) Å, at 293 K and a = 4.9656(15) Å at 12.5 K. The space group is P42/m
2/n (No. 223) for which the abbreviated symbols can be given as either Pm3n or Pmn. Cu Kα1 radiation (λ = 1.540598 Å) was used, and Ge (a = 5.6567 Å) was employed as an internal standard for the 293 K measurements. The 12.5 K value was obtained using the 293 K data as reference. Elemental analysis by X-ray fluorescence analysis. Estimated standard deviation 4–5%. Formula weight 504 (25). Volume of unit cell 122.79(4) Å3 at 293 K, 122.44(11) Å3 at 12.5 K. An average atomic weight was calculated as (3.25AMo + AIr)/4.25. Densities calculated for eight average `atoms'/unit cell: 12.8(6) Mg m−3 at 293 K, 12.9(6) Mg m−3 at 12.5 K. The JCPDS Diffraction File No. is 37-1482.
2/n (No. 223) for which the abbreviated symbols can be given as either Pm3n or Pmn. Cu Kα1 radiation (λ = 1.540598 Å) was used, and Ge (a = 5.6567 Å) was employed as an internal standard for the 293 K measurements. The 12.5 K value was obtained using the 293 K data as reference. Elemental analysis by X-ray fluorescence analysis. Estimated standard deviation 4–5%. Formula weight 504 (25). Volume of unit cell 122.79(4) Å3 at 293 K, 122.44(11) Å3 at 12.5 K. An average atomic weight was calculated as (3.25AMo + AIr)/4.25. Densities calculated for eight average `atoms'/unit cell: 12.8(6) Mg m−3 at 293 K, 12.9(6) Mg m−3 at 12.5 K. The JCPDS Diffraction File No. is 37-1482. 
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