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摘要
(1 - x)BaTiO3-xBiGdO(3) ceramics were prepared by the solid state reaction method. X-ray diffraction and Raman spectroscopy indicate a maximum co-solubility of Bi/Gd in BaTiO3 at x = 0.10 with a change of symmetry from tetragonal to pseudo-cubic at x = 0.08. Backscattered electron images, however, reveal the presence of a secondary phase in x >= 0.06. The dielectric behaviour evolves continuously with x from a classical ferroelectric to a typical relaxor and this transition is accompanied by a shift in the permittivity maxima towards lower temperatures. The presence of two dielectric anomalies for x >= 0.06 is associated with residual core shell structures, as revealed by transmission electron microscopy. The dielectric anomaly associated with the core regions remains at similar to 120 degrees C, whereas the other anomaly decreases continuously towards lower temperature with x. This study shows that chemical equilibrium is much more difficult to achieve than in other (1 - x)BaTiO3-xBi[Me]O-3 systems, where Me is Yb or Sc.
- 出版日期2015-9
