Sintering Behavior and Microwave Dielectric Properties of Li₂O-B₂O₃-SiO₂ Doped 0.67CaTiO₃-0.33LaAlO₃ Ceramics

Abstract:

A low temperature sintering method was used to avoid the relatively high sintering temperatures typically required to prepare 0.67CaTiO₃-0.33LaAlO₃ (CTLA) ceramics. 0.67CaTiO₃-0.33LaAlO₃ ceramics doped with Li₂O-B₂O₃-SiO₂ (LBS) were prepared by a conventional two-step solid-state reaction process. The sintering behavior, crystal structure, surface morphology, and microwave dielectric proprieties of the prepared ceramics were studied. As the small amount of LBS content increased, the small amount of liquid phase formed in an amorphous state around the surface of the grain boundaries. With the increase the content of LBS glass, the quality factor (Q×f) value decreased. CTLA+0.05 wt.% LBS ceramics sintered at 1320°C for 4h exhibited the optimal microwave dielectric properties of dielectric permittivity (ε_r) = 45.02, quality factor (Q×f) = 37400 GHz, and temperature coefficient of resonant frequency (τ_f) = 9.84 ppm/°C. .

• Periodical: Key Engineering Materials (Volume 726)
• Pages: 220-224
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.726.220
• Online since: January 2017
• Authors: Gan Wang, Juan Jiang*, Zhan Ming Dou, Fan Fan Ning, Er Tian Zhang, Tian Jin Zhang
• Keywords: CTLA, Li₂O-B₂O₃-SiO₂, Low-Temperature Sintering, Microwave Dielectric Ceramics

References

[1] J. Jiang, D. Fang, C. Lu, Z. Dou, G. Wang, F. Zhang, T. Zhang, Solid-state reaction mechanism and microwave dielectric properties of CaTiO3–LaAlO3 ceramics, J. Alloys Compd. 638 (2015) 443-7.

DOI: 10.1016/j.jallcom.2015.03.073

[2] Z. Dou, J. Jiang, G. Wang, F. Zhang, T. Zhang, Effect of Ga3+ substitution on the microwave dielectric properties of 0. 67CaTiO3–0. 33LaAlO3 ceramics, Ceram. Int. 42(6) (2016) 6743-8.

DOI: 10.1016/j.ceramint.2016.01.046

[3] G. Wang, J. Jiang, Z. Dou, F. Zhang, T. Zhang, Sintering behavior and microwave dielectric properties of 0. 67CaTiO3–0. 33LaAlO3 ceramics modified by B2O3–Li2O–Al2O3 and CeO2, Ceram. Int. (2016).

DOI: 10.1016/j.ceramint.2016.03.239

[4] B. Jancar, D. Suvorov, M. Valant, Microwave Dielectric Properties and Microstructural Characteristics of Aliovalently Doped Perovskite Ceramics Based on CaTiO3, Key Engineering Materials 206-213 (2002) 1289-92.

DOI: 10.4028/www.scientific.net/kem.206-213.1289

[5] J.H. Park, Y.J. Choi, J.H. Park, J.G. Park, Low-fire dielectric compositions with permittivity 20–60 for LTCC applications, Materials Chemistry and Physics 88(2-3) (2004) 308-12.

DOI: 10.1016/j.matchemphys.2004.07.016

[6] Y. Wang, R. Zuo, J. Zhang, S. Qi, T. Zhang, Sintering behavior and microwave dielectric properties of Li2O–B2O3–SiO2 doped MgTiO3–CaTiO3 ceramics, Journal of Materials Science: Materials in Electronics 26(7) (2015) 4963-8.

DOI: 10.1007/s10854-015-3008-1

[7] S. Duan, E. Li, H. Chen, B. Tang, Y. Yuan, X. Zhou, Low-temperature sintering and microwave dielectric properties of BaO–0. 15ZnO–4TiO2 ceramics with Li2O–B2O3–SiO2 addition, Journal of Materials Science: Materials in Electronics (2016).

DOI: 10.1007/s10854-016-4643-x

[8] C. Liu, H. Zhang, H. Su, T. Zhou, J. Li, X. Chen, W. Miao, et al., Low temperature sintering BBSZ glass modified Li2MgTi3O8 microwave dielectric ceramics,J. Alloys Compd. (2015).

DOI: 10.1016/j.jallcom.2015.06.046

[9] D.D. Khalyavin, A.N. Salak, A.M.R. Senos, P.Q. Mantas, V.M. Ferreira, Structure Sequence in the CaTiO3-LaAlO3 Microwave Ceramics-Revised, Journal of the American Ceramic Society 89(5) (2006) 1721-3.

DOI: 10.1111/j.1551-2916.2006.00929.x

[10] G. Chang, X.H. Zhou, Y.X. Li, S.R. Zhang, Sintering behavior and microwave dielectric properties of TiO2 added Ba4(Sm0. 5Nd0. 5)28/3Ti18O54 ceramics with Li2O–Al2O3–B2O3 glass addition, Journal of Materials Science: Materials in Electronics 25(11) (2014).

DOI: 10.1007/s10854-014-2228-0