Lithium-zinc-titanium-tin series microwave dielectric ceramics material and preparation method thereof

Abstract

The invention discloses a lithium-zinc-titanium-tin series microwave dielectric ceramics material and a preparation method thereof. A stoichiometric equation is Li2Zn(Ti(1-x)Snx)3O8, wherein x is larger than 0 and is less than or equal to 1. The preparation method comprises the following steps of: compounding Li2CO3, ZnO, TiO2 and SnO2 according to molar ratio; carrying out ball milling; stoving; carrying out presintering at the temperature of 900 DEG C; carrying out secondary ball milling; and sintering at the temperature of 1040-1120 DEG C finally to obtain microwave dielectric ceramics. When x is equal to 0.2, a dielectric constant is 22.1, a resonant frequency temperature coefficient is -22.5ppm / DEG C, and a quality factor reaches 80500 GHz. The preparation method successfully prepares the lithium-zinc-titanium-tin series microwave dielectric ceramics for the first time, and can be applied in a crossing field of microwave dielectric ceramics and multifunctional ceramics.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by composition, in particular to a novel Li 2 Zn(Ti 1-x sn x ) 3 o 8 The invention relates to a microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] At present, in order to obtain practical microwave dielectric ceramic materials, ceramic materials need to meet three requirements: (1) Higher dielectric constant ε r , which is convenient for the miniaturization of the device; (2) high quality factor (Q×f value), ensuring excellent frequency selection characteristics; (3) near-zero resonant frequency temperature coefficient τ f , to ensure stability. [0003] In recent years, researchers have studied SnO 2 For Ba(Zn 1 / 3 Nb 2 / 3 )O 3 and ZnO–TiO 2 The influence of crystal phase and microwave dielectric properties of microwave dielectric ceramics, the research results show that SnO 2 The microwave dielectric properties of dielectric ceram...

AI Technical Summary

Problems solved by technology

However, its quality factor needs to be improved, so as to ensure low loss when receiving and transmitting signals

Although the researchers have for Li 2 ZnTi 3 o 8 In-depth research on ceramics, but for Li 2 Zn(Ti 1-x sn x ) 3 o 8 There are no special reports on the preparation and microwave dielectric properties of ceramics

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