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Improved microstructure, dielectric and ferroelectric properties of microwave-sintered Sr0.5Ba0.5Nb2O6

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Title Improved microstructure, dielectric and ferroelectric properties of microwave-sintered Sr0.5Ba0.5Nb2O6
 
Creator PATRO, PK
KULKARNI, AR
GUPTA, SM
HARENDRANATH, CS
 
Subject strontium-barium-niobate
abnormal grain-growth
electrical-properties
ceramics
coprecipitation
strontium barium niobate
microwave sintering
lead-free ferroelectrics
duplex microstructure
dielectric
microstructure
 
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
 
Publisher ELSEVIER SCIENCE BV
 
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
 
Type Article
 
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
 
Language en