Abstract
The flat-cone instrument at the BER-II reactor in Berlin is well suited for systematic measurements of elastic and inelastic scattering events in large and continuous areas of Q-space. With this instrument the soft phonon branch, connected with the structural phase transition in SrTiO 3, has been studied in the ( hll) plane. In integral measurements the phonon branch shows up as two triangular intensity distributions around the superlattice points. The two-dimensional intensity distributions for a constant energy transfer reveal the anisotropy of the branch. The data collection time is considerably faster than with a conventional triple-axis instrument.
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