Preparation and Characterization of Bi2Ti2O7 Microwave Dielectric Ceramics by Citrate Sol-Gel Method

Yun Zhang; Ying Chun Zhang; Xiao Li Su; Mao Qiao Xiang

doi:10.4028/www.scientific.net/KEM.697.219

Paper Titles

Sintering of High Quality Titanium-Doped Zinc Oxide Ceramic Sputtering Target
p.198

Influence of Hot Pressing Process on the Properties of C_f/SiO₂ Composites
p.203

Fabrication and Properties of W-SiC_P/Cu Composites by Hot Pressing Sintering
p.207

Effect of Buried Powder Sintering on the Electrical and Piezoelectric Properties of CuO-Modified (Li,K,Na)(Nb,Sb)O₃Lead-Free Piezoceramics
p.211

Preparation and Characterization of Bi₂Ti₂O₇ Microwave Dielectric Ceramics by Citrate Sol-Gel Method
p.219

Evidence of Normal to Anti Ferroelectric Phase Transition of PLZT Transparent Ceramics of Different Zr/Ti Ratio
p.223

Using Ferroelectric Thin Film as the Dielectric for Electrowetting-on-Dielectric
p.227

Dielectric Breakdown and Failure of Ferroelectric Films as the Dielectric for Electrowetting Systems
p.231

The Electrical Properties of Epitaxial Grown Sc-Doped (Na_0.₈₅K_0.15)_0.5Bi_0.5TiO₃ Thin Film Prepared by Sol-Gel Method
p.235

HomeKey Engineering MaterialsKey Engineering Materials Vol. 697Preparation and Characterization of Bi2Ti2O7...

Preparation and Characterization of Bi₂Ti₂O₇ Microwave Dielectric Ceramics by Citrate Sol-Gel Method

Abstract:

Bi₂Ti₂O₇ microwave dielectric ceramics were synthesized by a modified sol-gel method using citric acid as metal chelating agent. The thermal decomposition behavior of the as-prepared precursor was characterized by XRD technique. The effects of the amount of citric acid and the molar ratio of bismuth nitrate to tetrabutyl titanate on the crystal structure of Bi₂Ti₂O₇ were also investigated. XRD results showed that well-crystallized Bi₂Ti₂O₇ powders could be synthesized by calcining the precursor at 550 °C as the molar ratio of CA to Bi was 1:1. Moreover, non-stoichiometric ratio of Bi to Ti was required to form the pure Bi₂Ti₂O₇ phase. However, Bi₄Ti₃O₁₂ and Bi₂Ti₄O₁₁ second phases were formed after sintering process. At 1150 °C, only the sample doped with 3 wt% Ho³⁺ showed a single pyrochlore structure, which exhibited good microwave dielectric properties with a high ε_r of 115.02, a Q × f of 1,515 GHz, and a τ_f of 30 ppm/°C.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Key Engineering Materials (Volume 697)

Pages:

219-222

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.697.219

Citation:

Cite this paper

Online since:

July 2016

Authors:

Yun Zhang, Ying Chun Zhang*, Xiao Li Su, Mao Qiao Xiang

Keywords:

Bi₂Ti₂O₇, Microwave Ceramic Dielectric

Export:

RIS, BibTeX

Price:

Permissions:

Request Permissions

* - Corresponding Author

References

[1] N. Ichinose, H. Amada, Preparation and microwave dielectric properties of the BaO·(Sm1-xLax)2O3·5TiO2 ceramic system, J. Eur. Ceram. Soc. 21 (2001) 2751-2753.

DOI: 10.1016/s0955-2219(01)00357-0

Google Scholar

[2] H. Takahashi, Y. Baba and K. Ezaki, Microwave dielectric properties and crystal structure of CaO-Li2O-(l-x)Sm2O3-xLn2O3-TiO2 (Ln: lanthanide) ceramics system. Jap. J. Appl. Phys. 35 (1996) 5069-5073.

Google Scholar

[3] C. L. Huang and M. H. Weng, The effect of PbO loss on microwave dielectric properties of (Pb, Ca)(Zr, Ti)O3 ceramics, Mater. Res. Bull. 36 (2001) 683-691.

DOI: 10.1016/s0025-5408(01)00531-1

Google Scholar

[4] C. Fujioka, R. Aoyagi, H. Takeda, S. Okamura, T. Shiosaki, Effect of non-stoichiometry on ferroelectricity and piezoelectricity in strontium bismuth tantalate ceramics. J. Eur. Ceram. Soc. 25 (2005) 2723-2726.

DOI: 10.1016/j.jeurceramsoc.2005.03.129

Google Scholar

[5] B. W. Hakki, P. D. Coleman, A dielectric resonator method of measuring inductive capacities in them millimeter range, IEEE Trans. Microw. Theory Tech. 8 (1960) 402-410.

DOI: 10.1109/tmtt.1960.1124749

Google Scholar

[6] W. E. Courtney, Analysis and evaluation of a method of measuring the complex permtivity of microwave insulators, IEEE Trans. Microw. Theory Tech. 18 (1970) 476-485.

DOI: 10.1109/tmtt.1970.1127271

Google Scholar

[7] Y. Kobayashiy, M. Katoh, Microwave measurement of dielectric properties of low-loss materials by the dielectric rod resonator method, IEEE Trans. Microw. Theory Tech. 33 (1985) 586-592.

DOI: 10.1109/tmtt.1985.1133033

Google Scholar

[8] W. F. Su, Y. T. Lu. Synthesis, phase transformation and dielectric properties of sol-gel derived Bi2Ti2O7 ceramics, Mater. Chem. Phys. 80 (2003) 632-637.

DOI: 10.1016/s0254-0584(03)00089-0

Google Scholar