Preparation and Microwave Dielectric Properties of (1-x)Ca_2/5Sm_2/5TiO₃ -x Li_1/2Nd_1/2TiO₃ Ceramics

Abstract:

(1-x) Ca2/5Sm2/5TiO3-x Li1/2Nd1/2TiO3 (CSLNT) ceramics, suitable for use in resonators or filters at microwave frequency, have a high εr and a low temperature coefficient of resonant frequency. The effects of calcinations on the microwave dielectric properties of CSLNT were studied. The CSLNT (x = 0.3) ceramics sintered at 1300oC for 3 h showed microwave properties with εr of 92, Qf of 5060 GHz and τf of 7.5 ppm/oC. The microwave dielectric properties of CSLNT (x = 0.3) ceramics were also improved by soft chemistry methods such as citric acid gel route and ethylenediaminetetraacetic acid (EDTA) chelating method. The excellent microwave properties with εr = 96, Qf = 6290 GHz and τf = 6 ppm/oC were obtained by EDTA chelating method for CSLNT (x = 0.3) ceramics.

• Periodical: Key Engineering Materials (Volumes 336-338)
• Pages: 293-296
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.336-338.293
• Online since: April 2007
• Authors: Guo Hua Huang, Qing Lian Xie, Jian Mei Xu, Yin Song Pan, Dong Xiang Zhou
• Keywords: Citric Acid (CA), Ethylenediaminetetraacetic Acid, Microwave Dielectric Ceramics, Soft Chemistry Method

References

[1] W.S. Kim, K.H. Yoon and E.S. Kim: Mater. Res. Bull. Vol. 34 (1999), p.2309.

[2] X. Hu, X.M. Chen and S.Y. Wu: J. Eur. Ceram. Soc. Vol. 23 (2003), pp. (1919).

[3] H. Ohsato, Y. Futamata, H. Sakashita, N. Araki, K. Kakimoto and S. Nishigaki: J. Eur. Ceram. Soc. Vol. 23(2003), p.2529.

[4] W.S. Kim, E.S. Kim and K.H. Yoon: J. Am. Ceram. Soc. Vol. 82 (1999), p.2111.

[5] W.S. Kim, K.H. Yoon and E.S. Kim: Jpn. J. Appl. Phys. Vol. 39 (2000), p.5650.

[6] Y. Xu, G. Huang, and H. Long: Mater. Lett. Vol. 57 (2003), p.3570.

[7] P. A. Lessing: Am. Ceram. Soc. Bull. Vol. 68 (1989), p.1002.

[8] J. Fransaer, J. R. Ross, L. Dalaey, O. Van Der Biest, O. Arkeens, and J. P. Celis: J. Appl. Phys. Vol. 65 (1989), p.3277.

[9] D. Zhou, G. Huang, Z. Zheng, J. Xu and S. Gong: Key Eng. Mater. Vol. 280-283 (2005), p.683.

[10] G. Huang, D. Zhou, J. Xu, Z. Zheng and S. Gong: Mater. Res. Bull. Vol. 40 (2005), p.13.

[11] B.W. Hakki, P.D. Coleman: IRE Trans. Microwave Theory Tech. Vol. MTT-8 (1960), p.402.

[12] W. E. Courtney: IEEE Trans. Microwave Theory Tech. Vol. MTT-18 (1970), p.476.

[13] H.C. Lu, L.E. Burkhart, and G.L. Schrader: J. Am. Ceram. Soc. Vol. 74 (1991), p.968.

[14] J.H. Choy, Y.S. Han, J.H. Sohn, and M. Itoh: J. Am. Ceram. Soc. Vol. 78 (1995), p.1169.