On the Crystal Dynamics of BaTiO3 near Tc

Abstract

Single crystals of BaTiO3 are studied by Mössbauer diffraction. Other workers in earlier exper‐iments indicate the existence of a remarkable broadening of the Bragg scattered radiation near Tc. Such broadening would be caused by low‐frequency excitations (≈︁ 107 Hz). These measurements are repeated and extended and no evidence for such low‐frequency excitations is found.

Application of semiconductor detector for recording the Rayleigh scattering of Mössbauer radiation

“…Later [6] the same BaTiO 3 monocrystal was investigated and authors did not observe any broadening of the line in the vicinity of the phase transition which could be explained as the existence of the low frequency (∼10 MHz) excitations. Thus, this article denied the results obtained in the analogous work [23].…”

“…Thus, the traditional Mössbauer spectroscopy is difficult to apply for the investigation of the dynamics of biomolecules and proteins. As a result, a new method based on the same Mössbauer effect but not requiring Mössbauer isotopes to be in the samples, the Rayleigh scattering of Mössbauer radiation (RSMR), has been developed and used [5][6][7][8][9][10]. In this method, the Möss-bauer gamma-radiation is scattered by the electron cloud of atoms of the investigated materials.…”