BaO-Ln2O3-TiO2-series microwave capacitor medium material and preparation method thereof

Abstract

The invention discloses a BaO-Ln2O3-TiO2-series microwave capacitor medium material and a preparation method thereof. The microwave capacitor medium material is characterized by consisting of (Ba1-X-YMgXMnY) (Nd2-ZSmZ) Ti5O14 serving as a main component, a sintering additive and a modification dopant, wherein X is equal to 0 to 0.02, Y is equal to 0 to 0.05 and Z is equal to 0.002 to 0.025; the sintering additive comprises one or the mixture of low-melting-point oxides such as Bi2O3, B2O3, CuO, V2O5, Li2O, ZnO, SiO2, Nb2O5, Ta2O5 and the like and low-melting-point glass powder; and the modification dopant comprises one or the mixture of different metal oxides such as ZrO2, MgO, TiO2, MnO2, SrO, CaO and the like. By adopting the method, the uniform microwave capacitor medium material which can be sintered at the temperature of between 1,250 DEG C and 1,330 DEG C and has high microwave dielectric property is prepared, wherein epsilon r is equal to 90 to 100, Q.f is more than or equal to 5,500 GHZ (3.5 to 4.5 GHZ), and tau f (at the temperature of between 40 DEG C below zero and 25 DEG C or between 25 DEG C and 125 DEG C) is less than or equal to 10 PPM / DEG C.

Description

technical field [0001] The present invention relates to a kind of BaO-Ln 2 o 3 -TiO 2 The invention relates to a microwave capacitor dielectric material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics is a new type of functional electronic ceramics developed rapidly in the past 30 years. It has the characteristics of low loss, small frequency temperature coefficient, and high dielectric constant. Microwave ceramic materials can be used to make dielectric resonators (Dielectric Resonator, DR for short), dielectric filters, duplexers, microwave dielectric antennas, dielectric frequency stabilized oscillators (called DRO), dielectric waveguide transmission lines, etc. Microwave dielectric ceramics have attracted worldwide attention in the fields of modern communications and military technology. At present, microwave devices are developing in the direction of high integration, miniaturization, high reliability and low cost. As a...

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Problems solved by technology

[0003] Although BaO-Ln 2 o 3 -TiO 2 It is a microwave capacitor dielectric material, but there is no main component (Ba 1-X-Y Mg X mn Y ) (Nd 2-Z SM Z ) Ti 5 o 14 Compound microwave capacitor dielectric material, when its main parameter εr=90~100, has defects such as low Q f, large temperature coefficient, etc., and is not suitable for use as dielectric resonators, dielectric filters, duplexers, microwave dielectric antennas, Dielectric stabilized oscillator, dielectric waveguide transmission line, etc.

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