Low temperature sintered multielement multiphase complex microwave medium ceramic and its preparation method

Abstract

The invention discloses a low-temperature sintered multi-component multi-phase composite microwave dielectric ceramic and a preparation method thereof. The microwave dielectric ceramic is composed of two-phase ceramics with positive and negative resonance frequency temperature coefficients, and its composition and proportion are: (1-u)[(Pb 1-x Ca x ) 1-3y / 2 La y ](Fe 1 / 2 Ta 1 / 2 )O 3 -uCa[(Fe 1 / 2 Ta 1 / 2 ) 1-z Ti z ]O 3 , where, 0.1≤u≤0.6, 0.4≤x≤0.8, 0≤y≤0.1, 0≤z≤0.2, [(Pb 1-x Ca x ) 1-3y / 2 La y ](Fe 1 / 2 Ta 1 / 2 )O 3 It is one of the main components of PbO, and there is at least Ca in the A position 2+ 、La 3+ One of the perovskite crystals, the other phase Ca[(Fe 1 / 2 Ta 1 / 2 ) 1-z Ti z ]O 3 Its B-site ions contain at least (Fe 1 / 2 Ta 1 / 2 ) 4+ and Ti 4+ One of. Its microwave dielectric properties can reach ε r =70~90, Qf>5000, τ f <30ppm / °C.

Description

technical field [0001] The invention belongs to the technical field of microwave ceramic materials and its preparation, and in particular relates to a low-temperature sintered multi-element multi-phase composite microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are key electronic materials used in microwave communications. In recent years, with the rise of mobile communication and wireless office network, higher and higher requirements have been put forward for microwave dielectric components: to make them have a large microwave dielectric constant, low microwave dielectric loss and good frequency Temperature stability, especially for some stacked devices with smaller size and more precise internal circuits, requires microwave dielectric ceramics to have a firing temperature lower than 1100 °C. [0003] In a series of high dielectric constant and low loss microwave dielectric ceramics that have been de...

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Problems solved by technology

[0003] In a series of high dielectric constant and low loss microwave dielectric ceramics that have been developed, such as Ba(Mg 1 / 3 Ta 2 / 3 )O 3 Department (see S.Nomura, Jpn.J.Appl.Phy., Vol21 (10), P624, 1982), (ZrSn) T i o 4 Department (see Y.C.Heiao, L.Wu and C.C.Wei, Mater.Res.Bull, Vol23, P1687, 1988) and BaO 2 -Ln 2 o 3 -T i o 2 (see Chen Xiangming CN98107577.0 BaO-Ln 2 o 3 -TiO 2 In the series of high-dielectric ceramics), the dielectric constant has not exceeded 100, and they all require a higher sintering temperature, such as greater than 1300 ° C, which makes it impossible for them to be co-fired with silver and other metals to form a chip laminate. devices, on the other hand, in the developed low-temperature sintered materials such as BiNbO 4 system (see C.Lhuang, M.H.Weng and C.C.Wu, Jpn.J.Appl.Phys., Vol39, P3506, 2000), and its dielectric constant is too low, such as ε r <60, which is not conducive to the further miniaturization of microwave dielectric components

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