Effect of MgO/ Eu2O3 Co-doping on the Microwave Dielectric Properties of Al2O3 Ceramics

doi:10.15541/jim20150081

Abstract

Abstract:

Al₂O₃ ceramics co-doped with MgO/Eu₂O₃ were prepared by wet chemical process. The effects of the content of MgO/Eu₂O₃ co-doping on phase composition, microstructure and microwave dielectric properties of Al₂O₃ ceramics were explored. The experimental results show that suitable contents of MgO/Eu₂O₃ can promote densification and grain growth of Al₂O₃. As to the dielectric properties, the influence of MgO/Eu₂O₃ co-doping on the dielectric constant can be ignored. However, it has a significant impact on the dielectric loss. The Q×f value increases initially and then decreases as the Eu₂O₃ content increases. Optimized microwave dielectric properties with ε_r~9.82, Q×f ~225,225 GHz. can be attained for the samples co-doped with 0.05wt% MgO/0.10wt% Eu₂O₃ sintered at 1590℃ for 4 h This change of Q×f value may relate to the change of sample’s microstructure. Firstly, when the content of MgO/Eu₂O₃ increases, the grain size increases and the grain boundary decreases, which is beneficial to increase the Q×f value. Then, as the content of MgO/Eu₂O₃ keeps increase, the grain size decreases and the grain boundary increases, which may lead to decrease Q×f value. In addition, the presence of strain and second phase may also influence the change of Q×f value.

Key words: alumina, MgO/Eu2O3 co-doping, microwave dielectric properties

CLC Number:

TQ174

ZHANG Kang, LI Wei, LIN Hui-Xin. Effect of MgO/ Eu₂O₃ Co-doping on the Microwave Dielectric Properties of Al₂O₃ Ceramics[J]. Journal of Inorganic Materials, 2015, 30(9): 984-988.

Figures/Tables 4

Fig. 1 Relative densities of Al2O3 ceramics co-doped with 0.05wt% MgO and different amounts of Eu2O3

Fig. 2 XRD patterns of Al2O3 ceramics co-doped with 0.05wt% MgO and different Eu2O3 contents (a) 0.03wt%; (b) 0.05wt%; (c) 0.10wt%; (d) 0.15wt%; (e) 0.20wt% Eu2O3

Fig. 3 SEM images of the samples doped with different Eu2O3 contents (a-e) and the curve of average grain sizes (f)

Fig. 4 Dielectric constants and Q×f values of samples with different amounts of MgO/Eu2O3 co-doped

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Effect of MgO/ Eu₂O₃ Co-doping on the Microwave Dielectric Properties of Al₂O₃ Ceramics

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