A-B site simultaneously substituting microwave dielectric ceramic material and preparation method thereof

Abstract

The invention provides an A-B site simultaneously substituting microwave dielectric ceramic material and a preparation method thereof. The general chemical formula of the material is (Ba1-aAa)6-3x(Nd1-bBb)8+2x(Ti1-cCc)18O54, C=MN, wherein x=3 / 4, a is greater than or equal to 0.05 and smaller than or equal to 0.2, b is greater than or equal to 0.05 and smaller than or equal to 0.15, c is greater than or equal to 0.02 and smaller than or equal to 0.08, A represents divalent Ca and Sr elements substituting A1 sites, B represents trivalent Sm and Bi elements substituting A2 sites, M represents Nb with the valence state higher than tetravalency, N represents other one or more elements with a valence state lower than tetravalency and an ionic radius similar to Ti, and M and N substitute simultaneously or individually. The preparation method includes: determining the respective mass percentage content according to the general chemical formula, conducting ball mill mixing, performing presintering under 1000-1150DEG C, and then conducting sintering at 1250-1450DEG C. The prepared material has adjustable dielectric constant and frequency-temperature coefficient and at the same time maintains a high Q*f value. The formula does not contain Pb, Cd and other volatile or heavy metals, the performance is greatly enhanced, the raw materials are in abundant supply, and the price is low, so that low cost of high performance microwave ceramics becomes possible.

Description

technical field [0001] The invention relates to the field of electronic component materials, in particular to a microwave dielectric ceramic material with AB positions simultaneously substituted and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of mobile communication technology and Internet of Things technology, the combination of the two has promoted the development of radio frequency identification (RFID). Radio frequency identification technology is not only one of the core technologies of the sensing layer of the Internet of Things, but also a wireless communication technology. Its system consists of readers, antennas and electronic tags. Microwaves are required for electronic tags, antennas and readers. Dielectric ceramic. Therefore, microwave dielectric ceramics are the core basic materials for preparing radio frequency electronic tags, and the dielectric constant of microwave dielectric ceramic materials is g...

AI Technical Summary

Problems solved by technology

Both have high Q×f values. Although composite perovskite structure ceramics (commonly replaced by A and B sites) generally have low frequency temperature coefficients, their dielectric constants are generally low (<60), And generally the sintering temperature is high (≥1400°C), which is not conducive to energy saving, and is not suitable for use in radio frequency identification

At the same time, the research progress of B-site substitution is slow, and there are few related literature reports

In order to adjust the frequency temperature coefficient to zero, the B-site tetravalent substitution will greatly reduce the dielectric constant and quality factor, while the B-site non-quaternary substitution will reduce the dielectric constant, but will maintain a high quality factor

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