Fabrication and electrical properties of textured Sr0.53Ba0.47Nb2O6 ceramics by templated grain growth
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Duran, C
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Penn State Univ, Dept Mat Sci & Engn, Mat Res Lab, University Pk, PA 16802 USAPenn State Univ, Dept Mat Sci & Engn, Mat Res Lab, University Pk, PA 16802 USA
Duran, C
[1
]
Trolier-McKinstry, S
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Penn State Univ, Dept Mat Sci & Engn, Mat Res Lab, University Pk, PA 16802 USAPenn State Univ, Dept Mat Sci & Engn, Mat Res Lab, University Pk, PA 16802 USA
Trolier-McKinstry, S
[1
]
Messing, GL
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Penn State Univ, Dept Mat Sci & Engn, Mat Res Lab, University Pk, PA 16802 USAPenn State Univ, Dept Mat Sci & Engn, Mat Res Lab, University Pk, PA 16802 USA
Messing, GL
[1
]
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[1] Penn State Univ, Dept Mat Sci & Engn, Mat Res Lab, University Pk, PA 16802 USA
Textured Sr0.53Ba0.47Nb2O6 ceramics with a relative density of >95% were fabricated using templated grain growth (TGG), Acicular KSr2Nb5O15 template particles synthesized via a molten salt process were aligned by tape casting in a mixture of solid-state-synthesized SrNb2O6 and BaNb2O6 powders. The resulting ceramics possessed strong fiber texture along the polar axis ([001]) of the strontium barium niobate. Samples with 15.4 wt% templates attained a textured fraction of 0.82 after sintering at a temperature of 1450 degrees C for 4 h. These materials showed peak dielectric constants of 7550 at 1 kHz, remanent polarizations of 13.2 mu C/cm(2), saturation polarizations of 21 mu C/cm(2) (60%-85% of the single-crystal value), piezoelectric strain coefficients of 78 pC/N (70%-85% of the single-crystal value), and room-temperature pyroelectric coefficients of 2.9 x 10(-2) mu C-.(cm(2) (.)degrees C)(-1) (52% of the single-crystal value). These results show that TGG is a viable option for accessing single-crystal properties in polycrystalline ceramics.
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页码:2203 / 2213
页数:11
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