PZN-PFW and PFN-PFW Relaxor Ferroelectric Ceramics by a Reaction-Sintering Process

Lead zinc niobate-lead iron tungstate (Pb((Zn0.3Nb0.7)0.6(Fe0.7W0.3)0.4)O3 PZN-PFW) and lead iron niobate-lead iron tungstate (Pb((Fe0.5Nb0.5)0.7(Fe0.7W0.3)0.3)O3 PFN-PFW) were synthesised by reaction sintering. Mixtures of PbO, zinc nitrate, ferric nitrate, niobium pentoxide and tungsten oxide were...

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Bibliographic Details
Published in:Journal of electroceramics 2004-07, Vol.13 (1-3), p.457-461
Main Authors: Liou, Yi-Cheng, Shih, Yi-Che, Chuang, Cheng-Jung
Format: Article
Language:English
Subjects:
Ceramics
Density
Dielectric constant
Ferroelectric materials
Perovskites
Pyrochlores
Sintering
Tungsten oxides
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Summary:Lead zinc niobate-lead iron tungstate (Pb((Zn0.3Nb0.7)0.6(Fe0.7W0.3)0.4)O3 PZN-PFW) and lead iron niobate-lead iron tungstate (Pb((Fe0.5Nb0.5)0.7(Fe0.7W0.3)0.3)O3 PFN-PFW) were synthesised by reaction sintering. Mixtures of PbO, zinc nitrate, ferric nitrate, niobium pentoxide and tungsten oxide were ball milled in acetone, dried and pulverised. Compacts were sintered at 900-1080 C in air. PZN-PFW of > 25% pyrochlore phase composition was obtained following 2 h sintering at 930-980 C. PFN-PFW of 100% perovskite phase composition was obtained by sintering for 4 h at 930-1080 C, and a density of 93.4% of theoretical was achieved on sintering at 1080 C for 4 h. The dielectric constant of PFN-PFW at < 1 kHz increased with increasing sintering temperature, attributed to the increasing density and grain size. A value of 32000 was achieved at 1080 C. 10 refs.
ISSN:1385-3449
1573-8663
DOI:10.1007/s10832-004-5142-7