  The effect of heat treatment on the structural and micro-structural
properties of the Co2-Y (Ba2Co2Fe12O22) was investigated by means of X-ray
diffraction and the Rietveld refinement. The samples were synthesized using
high-energy ball milling technique. Phase identification and Rietveld
refinement of the samples confirmed the presence of a single Y-type phase that
is consistent with reported patterns. Analysis of the lattice constants
obtained using the Rietveld refinement confirmed the presence of inner
distortion, which was responsible for increasing the lattice constants.
However, after the heat treatment, the lattice constants were in good agreement
with the reported pattern. The structural analysis using quadratic elongation
revealed distortions in the crystal structure. The structural analysis revealed
some differences in the cation-anion distances in some sites, while in other
sites, these distances remained the same. The use of the Rietveld refinement to
obtain micro-structural information about the size and the strain was reported.
Heat treatment induced diffusion between crystal domains leading to an increase
in crystallite size.
