6533b7d2fe1ef96bd125e964
RESEARCH PRODUCT
Indications of Two Separate Relaxators in the Subphonon Region of Tetragonal BaTiO 3
Marc D. FontanaM. MaglioneK. A. MüllerB. JannotK. Laabidisubject
PermittivityRange (particle radiation)Materials scienceCondensed matter physicsbusiness.industryRelaxation (NMR)General Physics and AstronomyDielectricLight scatteringlaw.inventionCondensed Matter::Materials ScienceTetragonal crystal systemsymbols.namesakeOpticslawsymbolsbusinessRaman spectroscopyElectron paramagnetic resonancedescription
Significant discrepancies were generally reported in the dynamics of BaTiO3 between results deduced from various experimental techniques. Here dielectric and quasi-elastic light scattering measurements are investigated on high-quality BaTiO3 crystals. We show that two relaxators have to be introduced below the soft-phonon frequency. A complete dielectric dispersion in a very wide frequency range is thus achieved which consistently relies the high-frequency dielectric results and the Raman data. There is also a qualitative agreement between our two-relaxator model and the dynamics which were deduced some time ago from EPR experiments.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1994-05-01 | Europhysics Letters (EPL) |