Structural Evolution and Microwave Dielectric Properties of Ba(Co_1/3(Nb_1-xW_5x/6)_2/3)O₃ Ceramics

Abstract:

Ba(Co_1/3(Nb_1-xW_5x/6)_2/3)O₃ (0<x≤0.05) (BCWN) microwave dielectric ceramics have been prepared by solid-state reaction method. The microstructure and microwave dielectric properties of BCWN ceramics were investigated systematically in this paper. The results show that the sintering temperature decreases with the substitution of W⁶⁺. The Ba(Co_1/3(Nb_1-xW_5x/6)_2/3)O₃ solid solution is formed with the small substitution of W⁶⁺ (x≤0.01). With the increase of x, the impurity phase BaWO₄ occurrs and the grains become less homogeneous. Combined with the analysis of X-Ray Diffraction, the cation ordering degree on B-site increases in the sample of x=0.01, which leads to the decrease of the dielectric loss. However, the second phase BaWO₄ inhibits the formation of the ordered structure with the reduction of sinterability. Due to the formation of BaWO₄, the values of ε_r and τ_f of all samples decrease subsequently. The optimized microwave dielectric properties of Ba(Co_1/3(Nb_1-xW_5x/6)_2/3)O₃ ceramics were obtained in the samples of x=0.01: ε_r=33.8, Q×f =110761 GHz, τ_f = -17 ppm/°C.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 585-590
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.585
• Online since: August 2018
• Authors: Zhe Fei Wang*, Chen Yao Zhai, Xu Hong Wang
• Keywords: 1:2 Ordered Structure, Complex Perovskite, Dielectric Property, W⁶⁺ Substitution

References

[1] A. Sayyadi-Shahraki, E. Taheri-Nassaj, H. Sharifi, et al. Origin of dielectric loss in Ba(Co1/3Nb2/3)O3 microwave ceramics, J Am Ceram Soc 101 (2018) 1665-1676.

DOI: 10.1111/jace.15343

[2] X. Y. Yang, H. Y. Wu, X. H Wang, et al. Two-step sintering: An approach to prepare Ba(Zn1/3Nb2/3)O3 ceramics with high degree of cation ordering, J Alloy Compd 723 (2017) 930-935.

DOI: 10.1016/j.jallcom.2017.06.323

[3] Y. Q. Zhang, X. H. Zhou, X. S. Yang, et al. Effects of Y2O3/CeO2 co-doping on microwave dielectric properties of Ba(Co0.6Zn0.38)1/3Nb2/3O3 ceramics, J Alloy Compd 679 (2016) 247-253.

DOI: 10.1016/j.jallcom.2016.04.009

[4] M. T. Sebastian, H. Jantunen. Low loss dielectric materials for LTCC applications: a review, Int Mater Rev 53 (2008) 57-90.

DOI: 10.1179/174328008x277524

[5] C. L. Huang, Y. H. Chien, C. F. Shih, et al. Crystal structure and dielectric properties of xCa(Mg1/3Nb2/3)O3–(1−x)(Ca0.61Nd0.26)TiO3 at the microwave frequency, Mater Res Bull 63 (2015) 1-5.

DOI: 10.1016/j.materresbull.2014.11.038

[6] J. E. F. S. Rodrigues, M. B. Debora, A. P. Maciel, et al. Structural ordering and dielectric properties of Ba3CaNb2O9-based microwave ceramics, Ceram Int 42 (2016) 18087-18093.

DOI: 10.1016/j.ceramint.2016.08.113

[7] T. Kolodiazhnyi. Origin of extrinsic dielectric loss in 1:2 ordered single-phase BaMg1/3Ta2/3O3, J Eur Ceram Soc 34 (2014) 1741-1753.

DOI: 10.1016/j.jeurceramsoc.2013.12.037

[8] P. P. Ma, L. Yi, X. Q. Liu, et al. Effects of postdensification annealing upon microstructures and microwave dielectric characteristics in Ba((Co0.6−x/2Zn0.4−x/2Mgx)1/3Nb2/3)O3 ceramics, J Am Ceram Soc 96 (2013) 3417-3424.

DOI: 10.1111/jace.12486

[9] M. S. Fu, X. Q. Liu, X. M. Chen. Effects of Mg substitution on microstructures and microwave dielectric properties of Ba(Zn1/3Nb2/3)O3 perovskite ceramics, J Am Ceram Soc 93 (2010) 787-795.

DOI: 10.1111/j.1551-2916.2009.03459.x

[10] P. P. Ma, H. Gu, X. M. Chen. Determination of 1:2 ordered domain boundaries in Ba[(Co, Zn, Mg)1/3Nb2/3]O3 dielectric ceramics, J Am Ceram Soc 99 (2016) 1299-1304.

DOI: 10.1111/jace.14107

[11] C. W. Ahn, H. J. Janga, S. Nahm et al. Effects of microstructure on the microwave dielectric properties of Ba(Co1/3Nb2/3)O3 and (1−x)Ba(Co1/3Nb2/3)O3–xBa(Zn1/3Nb2/3)O3 ceramics, J Eur Ceram Soc 23 (2003) 2473-2478.

DOI: 10.1016/s0955-2219(03)00151-1

[12] C. T. Chen, C. Y. Huang, Y. M. Lin, et al. Structure and microwave dielectric property relations in barium cobalt magnesium niobate ceramics, Jpn J Appl Phys 50 (2011) 091503(1-6).

DOI: 10.1143/jjap.50.091503

[13] T. L. Sun, L. Li, M. M. Mao et al. Effects of Postdensification Annealing on Microwave Dielectric Properties of Ba([Mg1−xCox]1/3Nb2/3)O3 Ceramics, Int J Appl Ceram Tec 10 (2013) E210-E218.

DOI: 10.1111/ijac.12126

[14] T. L. Sun, M. M. Mao, X. M. Chen. Structure and microwave dielectric properties of Ba[(Mg1−xNix)1/3Nb2/3]O3 ceramics, Mater Res Bull 72 (2015) 291-298.

[15] Y. K. Kim, K. M. Lee, H. M. Jang. 1:2 Long-range ordering and defect mechanism of WO3-doped perovskite Ba(Mg1/3Ta2/3)O3, J Mater Sci 35 (2000) 4885-4893.