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Effect of La substitution on structural and electrical properties of Ba(Fe2/3W1/3)O3 nanoceramics

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Abstract

The nanocrystalline fine powders (∼80 nm) of (Ba1−x La x )(Fe2/3W1/3)1−x/4O3, (BLFW) (x = 0.0, 0.05, 0.10 and 0.15) were synthesized with a combined mechanical activation and conventional high-temperature solid-state reaction methods. Preliminary X-ray structural analysis of pellet samples (prepared from fine powders) showed formation of a single-phase tetragonal system. Detailed studies of dielectric properties (εr and tan δ) exhibit that these parameters are strongly dependent on frequency, temperature and La composition. The La-substitution increases the dielectric constant and decreases the tan δ up to 10% substitutions of La at the Ba-site, and then reversed the variation, and hence this composition is considered as a critical composition. This observation was found valid for structure, microstructures, dielectric constant, electrical conductivity, J–E characteristics and impedance parameters also. Like in other perovskites (PZT, BZT), La substitution plays an important role in tailoring the properties of Ba(Fe2/3W1/3)O3 ceramics.

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Acknowledgement

This work was partially supported by the grants no. NASA-NCC3-1034, NSF-0305588 and DoD-W911NF-06-0030. We are thankful to Dr. P. Bhattacharya for some help in experimental works.

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  1. Department of Physics, University of Puerto Rico, San Juan, PR, 00931, USA

    R. N. P. Choudhary, Dillip K. Pradhan, C. M. Tirado, G. E. Bonilla & R. S. Katiyar

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  1. R. N. P. Choudhary
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  2. Dillip K. Pradhan
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  3. C. M. Tirado
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  4. G. E. Bonilla
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  5. R. S. Katiyar
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Correspondence to R. S. Katiyar.

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Choudhary, R.N.P., Pradhan, D.K., Tirado, C.M. et al. Effect of La substitution on structural and electrical properties of Ba(Fe2/3W1/3)O3 nanoceramics. J Mater Sci 42, 7423–7432 (2007). https://doi.org/10.1007/s10853-007-1835-z

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  • DOI: https://doi.org/10.1007/s10853-007-1835-z

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