Materials Research Bulletin, Vol.30, No.5, 621-630, 1995
A Neutron-Diffraction Study of 2 Strontium Cobalt Iron-Oxides
The structures of the perovskite and brownmillerite phases of the nonstoichiometric oxide SrCo0.8Fe0.2O3-delta have been refined by Rietveld analysis of powder neutron diffraction data. SrCo0.8Fe0.2O2.78 : M(r) = 190.575, cubic, space group (No. 221), a = 3.8491(2)Angstrom, V = 57.025(5)Angstrom(3), Z = 1, R(p) = 8.37%, R(wp) = 11.52%. Sr2Co1.6Fe0.4O5 : M(r) = 371.87, orthorhombic, space group Icmm (No. 74), a = 5.5981(3)Angstrom, b = 15.7832(8)Angstrom, c = 5.4692(3)Angstrom, V = 483.23(7)Angstrom(3), Z = 4, R(p) = 6.23%, R(wp) = 7.52%.