Low-temperature-sintering microwave dielectric ceramic Li2MgNb2O7 and preparation method thereof

A technology of microwave dielectric ceramics and low-temperature sintering, applied in the field of dielectric ceramic materials, can solve problems such as limited microwave dielectric ceramic systems, inability to meet the thermal stability requirements of devices, restrictions on low-temperature co-firing technology and the development of microwave multilayer devices, etc. , to meet the requirements of thermal stability, high application value and good sintering effect

Inactive Publication Date: 2014-09-24
SHANDONG XINGQIANG CHEM IND TECH RES INST CO LTD
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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

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  • Low-temperature-sintering microwave dielectric ceramic Li2MgNb2O7 and preparation method thereof

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[0019] Examples:

[0020] Table 1 shows three specific examples of different sintering temperatures constituting the present invention and their microwave dielectric properties. The preparation method is as described above, and the microwave dielectric properties are evaluated by the cylindrical dielectric resonator method.

[0021] This ceramic can be widely used in the manufacture of microwave devices such as various dielectric substrates, and can meet the technical needs of mobile communications and satellite communications systems.

[0022] Table 1:

[0023]

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Abstract

The invention discloses a low-temperature-sintering microwave dielectric ceramic Li2MgNb2O7 and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and proportioning Li2CO3, MgO and Nb2O5 original powders with the purity of higher than 99.9% according to the composition of the Li2MgNb2O7; (2) carrying out wet ball milling mixing on the raw materials in the step (1) for 12 hours by using distilled water as a ball milling medium, drying, and presintering in an 850 DEG C atmospheric atmosphere for 6 hours; and (3) adding an adhesive into the powder prepared in the step (2), granulating, compacting, and finally, sintering in a 900-930 DEG C atmospheric atmosphere for 4 hours, wherein the adhesive adopts a 5 wt% polyvinyl alcohol solution, and the addition amount of the polyvinyl alcohol is 3% of the total mass of the powder. The ceramic has favorable sintering property at 900-930 DEG C, the dielectric constant reaches 25.6-26.3, the quality factor Qf value is up to 79000-88000 GHz, the temperature coefficient of resonance frequency is small, and the ceramic has great application value in industry.

Description

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Claims

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Application Information

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Owner SHANDONG XINGQIANG CHEM IND TECH RES INST CO LTD
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