Improved microstructure, dielectric and ferroelectric properties of microwave-sintered Sr0.5Ba0.5Nb2O6
DSpace at IIT Bombay
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Title |
Improved microstructure, dielectric and ferroelectric properties of microwave-sintered Sr0.5Ba0.5Nb2O6
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Creator |
PATRO, PK
KULKARNI, AR GUPTA, SM HARENDRANATH, CS |
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Subject |
strontium-barium-niobate
abnormal grain-growth electrical-properties ceramics coprecipitation strontium barium niobate microwave sintering lead-free ferroelectrics duplex microstructure dielectric microstructure |
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Description |
Ferroelectric strontium barium niobate (SBN) powder was synthesized by solid-state route. The green compacts were sintered in the temperature range 1250-1350 degrees C in a microwave furnace. The microstructural study, using SEM, revealed the grain size in the range 2-20 mu m without microcracks, depending on the sintering temperature. This is in contrast to that obtained conventionally for sintered SBN powder synthesized by solid-state route, which resulted in duplex microstructure with microcracks [N.S. VanDamme, A.E. Sutherland, L. Jones, K. Bridger, S.R. Winzer, J. Am. Ceram. Soc. 74 (1991) 1785; P.K. Patro, A.R. Kulkarni, C.S. Harendranath, Ceram. Int. 30 (2004) 1405; P.K. Patro, Trans. Ind. Inst. Metals 59 (2006) 229]. Impedance analyzer and ferroelectric hysteresis loop tracer were used for the dielectric, ferroelectric, I-V and electric fatigue measurements. Microwave sintering also resulted in a dielectric maxima epsilon(max) 2590 at 1 kHz (compared to 1103 for conventional sintering [P.K. Patro, A.R. Kulkarni, C.S. Harendranath, Ceram. Int. 30 (2004) 1405]) for the sintering temperature of 1350 degrees C. Similar improvement in microwave-sintered SBN was observed depending on their sintering condition. The origin of this difference is attributed to microstructural differences arising from difference in heating method. In this paper the observed dielectric and ferroelectric behavior have been correlated with different sintering conditions and consequent microstructure due to microwave sintering. (C) 2007
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Publisher |
ELSEVIER SCIENCE BV
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Date |
2011-07-25T07:07:19Z
2011-12-26T12:50:11Z 2011-12-27T05:36:17Z 2011-07-25T07:07:19Z 2011-12-26T12:50:11Z 2011-12-27T05:36:17Z 2007 |
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Type |
Article
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Identifier |
PHYSICA B-CONDENSED MATTER, 400(1-2), 237-242
0921-4526 http://dx.doi.org/10.1016/j.physb.2007.07.022 http://dspace.library.iitb.ac.in/xmlui/handle/10054/6669 http://hdl.handle.net/10054/6669 |
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Language |
en
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