Synthesis and Characterization of Aurivillius Phases in the Bi–Ag–Ti–O System |
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Authors: | Xing Hu Sreo D kapin Danilo Suvorov |
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Affiliation: | Advanced Materials Department, Jo?ef Stefan Institute, 1000 Ljubljana, Slovenia |
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Abstract: | New Aurivillius phases in the Bi–Ag–Ti–O system were investigated by means of a solid-state reaction and X-ray diffraction. We found that the oxygen partial pressure has a significant influence on the synthesis of the Aurivillius phases. The mixed-layer Aurivillius phase Ag0.5Bi8.5Ti7O27 was observed after firing in an O2 flow, but a single-phase material is difficult to obtain. A single-phase compound of the four-layer Aurivillius phase Ag0.5Bi4.5Ti4O15 was obtained on firing in an oxygen partial pressure of 10 bar (1 × 106 Pa). The dielectric properties (at 1 MHz) of the Ag0.5Bi4.5Ti4O15 compound were as follows: T max=687°C, ? r =166 (~20°C), and tan δ=0.004 (~20°C). |
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