Abstract
The low frequency phonon mode in SrTi18O3 has been investigated by highresolution technique, in order to clarify the relationship between the perfect softening of the ferroelectric Eu mode and the acoustic anomaly in the c44 mode reported previously near the phase transition point Tc. The drastic softening and the anomalous increase of intensity were reported as the anomalous behavior of the c44 mode. However, in the present paper the anomaly of the c44 mode has not been observed in the spectra of SrTi18O3 with the 18O isotope concentration of 95%, though the perfect softening of the Eu mode has been confirmed clearly. The obtained result indicates that the anomalous behavior reported in the c44 mode is not intrinsic for the ferroelectric phase transition. The acoustic anomaly might be related to the ferroelectric phase transition through the coupling effects induced by a sample-depending internal stress originated in the structural phase transition at 105 K or the ferroelectric micro regions.
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