التفاصيل البيبلوغرافية
| العنوان: |
Phase transition in ABi4Ti4O15 (A=Ca,Sr,Ba) Aurivillius oxides prepared through a soft chemical route. |
| المؤلفون: |
Rout, S. K., Sinha, E., Hussian, A., Lee, J. S., Ahn, C. W., Kim, I. W., Woo, S. I. |
| المصدر: |
Journal of Applied Physics; Jan2009, Vol. 105 Issue 2, pN.PAG, 6p, 1 Diagram, 8 Graphs |
| مصطلحات موضوعية: |
PHASE transitions, OXIDES, DIELECTRIC relaxation, PEROVSKITE, OXALATES, SYMMETRY (Physics) |
| مستخلص: |
A series of compounds, CaBi4Ti4O15 (CBT), SrBi4Ti4O15 (SBT), and BaBi4Ti4O15 (BBT), belonging to the Aurivillus-type structure (four layers) has been prepared by a modified chemical route. Different oxalates were precipitated from their respective nitrate solution onto the surface of TiO2 powders. The room temperature x-ray diffraction study reveled that the compounds were having orthorhombic symmetry. Considering the tolerance factor, a significant deformation of the perovskite block is observed and that decreases with increase in ionic radius of A site atom. Temperature dependent dielectric study showed normal ferroelectric to paraelectric transition well above the room temperature except for BBT. The BBT ceramic showed a relaxorlike behavior near phase transition. The quantitative characterization and comparison of relaxor behavior were based on empirical parameters γ and ΔTres. The dielectric relaxation rate follows the Vogel–Fulcher relation with activation energy=0.02 eV and freezing temperature=362 °C. All these measurements confirmed its relaxorlike phase transition. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
