Medium-temperature sintered microwave dielectric ceramic and method for preparing same

Abstract

The invention discloses medium-temperature sintered microwave dielectric ceramic. A compound expression of the medium-temperature sintered microwave dielectric ceramic is Zn<3>Nb<2-x>Sb<x>O<8>. The xin the compound expression is equal to 0.01-0.07. A method for preparing the medium-temperature sintered microwave dielectric ceramic includes proportioning ZnO, Nb<2>O<5> and Sb<2>O<5> according to stoichiometric equations; carrying out ball-milling, drying and sieving on the ZnO, the Nb<2>O<5> and the Sb<2>O<5>; calcining the ZnO, the Nb<2>O<5> and the Sb<2>O<5> at the temperatures of 1100 DEG C; adding 0.9%-1.1% of polyvinyl alcohol into the ZnO, the Nb<2>O<5> and the Sb<2>O<5> to obtain mixtures and granulating the mixtures; carrying out pressure molding to obtain green bodies; sintering the green bodies at the temperatures of 1150-1210 DEG C to obtain the medium-temperature sintered microwave dielectric ceramic. The medium-temperature sintered microwave dielectric ceramic and the method have the advantages that the dielectric constant epsilon r of the medium-temperature sintered microwave dielectric ceramic ranges from 21 to 22, a quality factor Qf value of the medium-temperaturesintered microwave dielectric ceramic ranges from 80350 GHz to 100881 GHz, and the temperature coefficient tao f of resonance frequency of the medium-temperature sintered microwave dielectric ceramicranges from -64 ppm / DEG C to -70 ppm / DEG C; the medium-temperature sintered microwave dielectric ceramic without Ti can be applied to reducing atmosphere sintering; processes for the medium-temperature sintered microwave dielectric ceramic are simple, the time and energy costs can be saved, and the medium-temperature sintered microwave dielectric ceramic and the method have broad application prospects.

Description

technical field [0001] The present invention belongs to a kind of ceramic composition characterized by composition, especially relates to a kind of Zn 3 Nb 2-x Sb x o 8 A microwave dielectric ceramic material with a chemical formula of medium temperature sintering and good microwave dielectric properties and a preparation method thereof. Background technique [0002] Microwave signals have extremely high frequency, extremely short wavelength, large information capacity, strong directivity, penetration and absorption capabilities, and microwave equipment can achieve communication confidentiality, which is very beneficial to applications in the field of communication technology and military fields. In recent years, the field of microwave communication has developed rapidly. The field of microwave communication, represented by satellite communication, car phone and portable phone, etc., constantly raises new and higher requirements for microwave materials used as communicat...

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Problems solved by technology

Systems containing variable valence elements, such as titanate, have been reduced in a reducing atmosphere, resulting in oxygen vacancies, resulting in a sharp deterioration in dielectric properties

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