A low-temperature sintered microwave dielectric material mg 2-x co x v 2 o 7 and its preparation method

Abstract

The invention belongs to the field of electronic ceramics and its manufacture, and provides a low-temperature sintered microwave dielectric material and a preparation method thereof; the low-temperature sintered microwave dielectric material is: Mg 2‑x co x V 2 o 7 (0.5≤x≤1.0), its crystal phase is: Mg 2 V 2 o 7 , the crystal structure is: monoclinic crystal structure, cobalt ions and magnesium ions occupy the A site together. In the present invention, the addition of cobalt ion makes the crystal phase Mg of microwave medium 2 V 2 o 7 From the triclinic structure to the monoclinic structure, the grain grows and the atomic packing rate increases, which greatly improves the Q×f value; at the same time, the low temperature sintering at 860-870°C is realized, which solves the problem of microwave dielectric materials The problem of high sintering temperature. The invention provides a low-temperature sintered microwave dielectric material with excellent microwave dielectric properties at a sintering temperature of 860-870°C: a dielectric constant of 8-9, a Q×f value of 66000-72000 GHz, and a resonant frequency temperature coefficient of -30-- 26ppm / °C; moreover, the low-temperature sintered microwave dielectric material has a simple preparation process and low production cost, which is conducive to realizing industrial production.

Description

A low temperature sintered microwave dielectric material Mg 2‑x Co x V 2 O 7 and preparation method thereof technical field The invention belongs to the field of electronic ceramics and manufacture thereof, relate to microwave dielectric ceramics Mg 2 V 2 O 7 doping modification, specific A kind of low temperature sintering microwave dielectric material Mg 2‑x Co x V 2 O 7 and its preparation method. Background technique Low temperature co-fired ceramic (LTCC) technology has been widely used in the field of microwave device preparation, such as mobile phones, satellite Radio, radar, etc. Practical microwave dielectric materials need to have low dielectric loss, appropriate dielectric constant and near zero harmonics. temperature coefficient of vibration frequency. MgO‑V 2 O 5 Vanadates are widely used for their inherent low sintering temperature and excellent microwave performance. Note, Joung et al published an a...

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Problems solved by technology

In this paper, the solid-state reaction method was used to prepare Mg 2 V 2 o 7 Microwave dielectric ceramics whose microwave dielectric properties are ε r =10.5, Q×f=58275GHz, τ f =-26.9ppm / ℃, the sintering temperature is still high, and the microwave dielectric properties need to be improved

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