Raman and XPS Studies for Ba_<1-x>Eu_xTiO_3 Synthesized by High Pressure and Temperature
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A series of perovskite oxides of Ba<SUB>1-x</SUB>Eu<SUB>x</SUB>TiO<SUB>3</SUB> (x=0. 0, 0. 1, 0. 2, 0. 3, 0. 4) were synthesized under 4. 0GPa and at 1090°C. The samples with x=0. 0 and 0. 1 are mixed phase of cubic and tetragonal, whereas those with x=0. 2, 0. 3 and 0. 4 are single phases. The structural transformation from tetragonal to cubic was observed at x=0. 3. Raman spectra of BaTiO<SUB>3</SUB> exhibited four bands which is consistent with tetragonal structure. For x=0. 2 and 0. 4 samples, only one band at low frequency was observed. XPS and EPR measurements indicated that Eu and Ti ions were in mixed valence.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 1028-1030, 1998
The Japan Society of High Pressure Science and Technology