Zirconium crystal structures, lattice parameters

Ceria-zirconia nanophases were synthesied by a surfactant-assisted method. The refined structural data concerning the crystallite size, lattice parameters, structural microstrain, cationic occupy number and cationic defect concentration are reported. Zirconium addition into the cubic structure of ceria inhibits crystal sintering but leads to structure distortion. Different CO-metal bonds are formed when CO chemisorbs on Pd-loaded CesZr. x02 catalysts. Catalytic tests reveal that the lower zirconium content benefits the CO oxidation. 

The crystal structure measurements were carried out using high temperature X-ray diffraction. Reference measurements were also obtained at 25°C, from which the lattice parameters, a = (3.233 0.001) x 10 m and c = (5.1475 0.0015) x 10 m, axial ratio, ate = (0.6281 0.0004), unit eell volume, (46.595 + 0.037) x 10 m and density, (6.501 0.005) g-cm were determined. High temperature measurements were taken from 950 to 1164 K for a-zirconium, however, there was a reasonable amount of scatter in the data obtained at these temperatures. Crystal structure measurements were also taken for p-zirconium. For this phase, reference measurements were taken at 1252 K leading to a lattice parameter of a = (3.6162 + 0.0020) x 10 m, a unit cell volume of (47.285 0.080) x 10 m" and a density of (6.406 0.011) g-cm ... 

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