Ceramic specimens of BaO . Pr2O3. 4TiO(2) (Ba4.5Pr9Ti18O54) were prepared b
y the mixed oxide-route. The single phase products were examined by High Re
solution Transmission Electron Microscopy (HRTEM). Orthorhombic symmetry, w
ith cell parameters a similar to 22.2 Angstrom, b similar to 12.2 Angstrom
and c similar to7.6 Angstrom, was confirmed. On the basis of space group pn
am (No. 62) and the crystal structural data of Rawn et al., good agreement
was obtained between the experimental HRTEM images and images simulated by
the multislice method. (C) 2001 Kluwer Academic Publishers.