Microwave dielectric ceramic Li2Zn2W2O9 capable of being sintered at low temperature and preparation method thereof

Abstract

The invention discloses application of composite oxide Li2Zn2W2O9 as a microwave dielectric ceramic capable of being sintered at low temperature; and a preparation method of the dielectric ceramic comprises the following steps: (1) weighing for batching Li2CO3, ZnO and WO3 original powder with the purity of more than 99.9% according to the chemical formula Li2Zn2W2O9; (2) mixing the raw materials of the steps (1) by wet ball milling for 12 hours with a milling medium being distilled water, drying, then presintering at 650 DEG C in air atmosphere for 6 hours; (3) adding a binder into the powder prepared in the step (2), granulating, then pressing for forming, and finally sintering at 700-750DEG C in the air atmosphere for 4 hours; the binder is a polyvinyl alcohol solution with the mass concentration of 5%, and added polyvinyl alcohol accounts for 3% of the total mass of the powder. The prepared dielectric ceramic Li2Zn2W2O9 can be well sintered at 700-750DEG C, the dielectric constant reaches to 19-20, the quality factor Qf value reaches as high as 67000-82000GHz, the temperature coefficient of resonance frequency is low, and the dielectric ceramic has great application value in industry.

Description

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AI Technical Summary

Problems solved by technology

[0010] In the process of exploring and developing new low-firing microwave dielectric ceramic materials, material systems such as Li-based compounds, Bi-based compounds, tungstate compounds, and tellurate-based compounds with inherently low sintering temperatures have received extensive attention and research. A large number of exploratory studies have focused on Li-based binary or ternary compounds, and developed such as Li 2 TiO 3 , Li 2 MoO 4 and Li 2 MTi 3 o 8 (M=Mg or Zn) series of microwave dielectric ceramics with good performance, etc., but the microwave dielectric ceramic system that

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