Sintering Behavior and Microwave Dielectric Properties of MgTiO3 Ceramics Doped with B2O3 by Sol-Gel Method

J Mater Sci Technol ›› 2012, Vol. 28 ›› Issue (8): 751-755.

• Mechanical and Functional Properties of Materials • Previous Articles Next Articles

Sintering Behavior and Microwave Dielectric Properties of MgTiO₃ Ceramics Doped with B₂O₃ by Sol-Gel Method

Huanping Wang, Qinghua Yang, Denghao Li, Lihui Huang, Shilong Zhao, Shiqing Xu

College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China

Received:2011-03-16 Revised:2011-09-09 Online:2012-08-31 Published:2012-08-30
Contact: Shiqing Xu
Supported by:
Project of New Century Excellent Talents in University (No. NCET-07-0786), the Science and Technology Innovative Research Team of Zhejiang Province (No. 2009R50010) and the Zhejiang Science and Technology Innovation Projects for students (No. 2009R409014)

Abstract

Abstract:

The B₂O₃-doped MgTiO₃powders and ceramics have been prepared by sol-gel method using Mg(NO₃)2?6H₂O, Ti(C₄H₉O)₄ and H₃BO₃ as the starting materials. The sintering behavior and microwave dielectric properties of ceramics prepared from powders with different particle sizes were investigated. The gels were calcined at 650, 700, 750, 800, 850 and 900°C and the derived particle sizes of powders were 20-30 nm, 30-40 nm, 40-60 nm, 60-90 nm, 90-120 nm and 120-150 nm, respectively. The nanoparticles with the size of 30{60 nm benefited the sintering process with high surface energy whereas nanoparticles with the size of 20-30 nm damaged the microwave dielectric properties due to the pores in the ceramics. The addition of B₂O₃ used as
a liquid sintering aid reduced the sintering temperature of MgTiO₃ ceramic, which was supposed to enter the MgTiO₃lattice and resulted in the formation of (MgTi)₂(BO₃)O phase. The B₂O₃-doped MgTiO₃ ceramic sintered at 1100°C and prepared from the nanoparticles of 40-60 nm had compact structure and exhibited good microwave dielectric properties: ε_r=17.63, Q × f=33,768 GHz and τ_f=-48×10-6 °C^-1.

Key words: MgTiO₃ ceramic, B₂O₃ addition, Sol-gel, Dielectric properties

Huanping Wang, Qinghua Yang, Denghao Li, Lihui Huang, Shilong Zhao, Shiqing Xu. Sintering Behavior and Microwave Dielectric Properties of MgTiO₃ Ceramics Doped with B₂O₃ by Sol-Gel Method[J]. J Mater Sci Technol, 2012, 28(8): 751-755.

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Sintering Behavior and Microwave Dielectric Properties of MgTiO₃ Ceramics Doped with B₂O₃ by Sol-Gel Method

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