Influence of Sintering Temperature on Densification, Structure and Microstructure of Li and Sb Co-Modified (K,Na)NbO3-Based Ceramics
Rashmi Rani, Seema Sharma
.
DOI: 10.4236/msa.2011.210191   PDF   HTML     5,918 Downloads   9,165 Views   Citations

Abstract

Polycrystalline samples of Lead free (K0.5Na0.5)1-x(Li)x(Sb)x(Nb)1-xO3 ceramics with nominal compositions (x = 0.040 to 0.060) have been prepared by high temperature solid state reaction technique. X-ray diffraction (XRD) pattern shows that the crystal structure transforms from orthorhombic to tetragonal as Li and Sb content increases. Normal sintering process yield compounds with density ~98.2% of the theoretical value. Densification of the Li and Sb co-doped KNN ceramics might be explained by the liquid-phase sintering. This may be attributed to the low melting temperature of Li compounds that appears to promote the formation of a liquid phase during sintering.

Share and Cite:

R. Rani and S. Sharma, "Influence of Sintering Temperature on Densification, Structure and Microstructure of Li and Sb Co-Modified (K,Na)NbO3-Based Ceramics," Materials Sciences and Applications, Vol. 2 No. 10, 2011, pp. 1416-1420. doi: 10.4236/msa.2011.210191.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] G. H. Haerting, “Properties of Hot-Pressed Ferroelectric Alkali Niobate Ceramics,” Journal of the American Ceramic Society, Vol. 50, No. 6, 1967, pp. 229-230.
[2] R. E. Jaeger and L. Egerton, “Hot Pressing of Potassium-Sodium Niobates,” Journal of the American Ceramic Society, Vol. 45, No. 5, 1962, pp. 209-213. doi:10.1111/j.1151-2916.1962.tb11127.x
[3] L. Egerton and D. M. Dillon, “Piezoelectric and Dielectric Properties of Ceramics in the System Potassium-So- dium Niobate,” Journal of the American Ceramic Society, Vol. 42, No. 9, 1959, pp. 438-442. doi:10.1111/j.1151-2916.1959.tb12971.x
[4] M. Kosec and D. Kolar, “On Activated Sintering and Electrical Properties of NaKNbO3,” Materials Research Bulletin, Vol. 10, No. 5, 1975, pp. 335-340. doi:10.1016/0025-5408(75)90002-1
[5] S. Narayana Murty, K. V. Ramana Murty, K. Umakantham and A. Bhanumathi, “Modified (NaK)NbO3 Ceramics for Transducer Applications,” Ferroelectrics, Vol. 102, No. 1, 1990, pp. 243-247. doi:10.1080/00150199008221484
[6] J.-F. Li, K. Wang, B. P. Zhang and L. M. Zhang, “Ferroelectric and Piezoelectric Properties of Fine-Grained Na0.5K0.5NbO3 Lead-Free Piezoelectric Ceramics Prepared by Spark Plasma Sintering,” Journal of the American Ceramic Society, Vol. 89, No. 2, 2006, pp. 706-709. doi:10.1111/j.1551-2916.2005.00743.x
[7] R. P. Wang, R. J. Xie, T. Sekiya and Y. Shimojo, “Fabrication and Characterization of Potassium-Sodium Niobate Piezoelectric Ceramics by Spark-Plasma-Sintering Method,” Materials Research Bulletin, Vol. 39, No. 11, 2004, pp 1709-1715. doi:10.1016/j.materresbull.2004.05.007
[8] S. Tashiro, H. Nagamatsu and K. Nagata, “Sinterability and Piezoelectric Properties of KNbO3 Ceramics after Substituting Pb and Na for K,” Japanese Journal of Applied Physics, Vol. 4, No. 11B, 2002, pp. 7113-7118. doi:10.1143/JJAP.41.7113
[9] E. Hollenstein, M. Davis, D. Damjanovic and N. Setter, “Piezoelectric Properties of Li- and Ta-Modified (Na0.5K0.5) NbO3 Ceramics,” Applied Physics Letters, Vol. 87, No. 18, 2005, pp. 182905-182907. doi:10.1063/1.2123387
[10] M. Matsubara, T. Yamaguchi, K. Kikuta and S. Hirano, “Effect of Li Substitution on the Piezoelectric Properties of Potassium Sodium Niobate Ceramics,” Japanese Jour- nal of Applied Physics, Vol. 44, No. 8, 2005, pp. 6136- 6142. doi:10.1143/JJAP.44.6136
[11] International Centre for Diffraction Data, JCPDS-ICDD 2001, File No. 71-2171.
[12] International centre for Diffraction Data, JCPDS-ICDD 2001, File No. 71-0945.
[13] J. S. Chun, N. M. Hwang, D. Y. Kim and J. K. Park, “Abnormal Grain Growth Occurring at the Surface of a Sintered BaTiO3 Specimen,” Journal of the American Ceramic Society, Vol. 87, No. 9, 2004, pp. 1779-1781. doi:10.1111/j.1551-2916.2004.01779.x
[14] B.-P. Zhang, J. F. Li and K. Wang, “Compositional Dependence of Piezoelectric Properties in NaxK1–xNbO3 Lead-Free ceramics Prepared by Spark Plasma Sintering,” Journal of the American Ceramic Society, Vol. 89, No. 5, 2006, pp. 1605-1609. doi:10.1111/j.1551-2916.2006.00960.x
[15] Gmelins Handbuch der Anorganischen Chemie, Verlag Chemie, Weinheim, 1969, Ch. 22, p. 834.
[16] Gmelins Handbuch der Anorganischen Chemie, Verlag Chemie, Weinheim, 1969, Ch. 21, p. 1317.

Copyright © 2021 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.