Moussbauer spectroscopy of BaTiO3 and SrTiO3

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Abstract
Single crystals and ceramics of BaTiO3 and SrTiO3 have been studied by Mossbauer spectroscopy. The materials were investigated as sources and absorbers, doped with Fe57 (Co57) and Sn119. In the preparation of the samples various parameters (temperature, atmosphere, impurity concentration etc.) have been changed. It turned out to be a difficult problem to incorporate Fe into BaTiO3 or SrTiO3 lattices at the Ti4+ site. Thermal doping of single crystals was unsuccessful, in this case a second phase was formed by the addition of Fe57 and Co57. In melt grown BaTiO3 crystals a few hundred ppm Fe could be incorporated in the lattice trivalently. In contrast, Sn is relatively easy to introduce into BaTiO3 and the Mossbauer spectrum of a melt grown single crystal shows a very sharp line. No effects of phase transitions on the hyperfine parameters or the Debye Waller factor could be detected.