Ca-Nd-Ti microwave dielectric ceramic material and preparation method thereof

Abstract

The invention provides a Ca-Nd-Ti microwave dielectric ceramic material and a preparation method thereof. The general chemical formula of the material is Ca0.61Nd0.26(Ti1-xCx)O3 and C=MN, wherein x is larger than or equal to 0.15 and smaller than or equal to 0.2, and the aim of controlling the microwave performance of a system is achieved through B-site substitution; M represents Nb with valence state higher than tetravalence, N represents one or more of elements with valence state lower than tetravalence and ionic radius similar to that of Ti, and simultaneous substitution or independent substitution is achieved for M and N. The preparation method includes the steps of determining weight percentage contents of all components according to the general chemical formula, conducting ball-milling and mixing, conducting presintering at a temperature of 1050 DEG C to 1150 DEG C, and conducting sintering at a temperature of 1350 DEG C to 1450 DEG C to obtain the material. The dielectric constant, ranging from 70 to 100, of the obtained material and the frequency temperature coefficient of the material can be adjusted, and meanwhile the excellent Q*f value is kept between 9000 GHz and 16000 GHz; Pb, Cd and other volatile or heavy metal are not contained in the formula, performance is greatly improved compared with other systems, raw materials are sufficiently supplied in domestic, price is lower than that of other systems, and it is made possible that high-performance microwave ceramic is low in cost.

Description

technical field [0001] The invention relates to the field of electronic component materials, in particular to a method for preparing a B-site substituted Ca-Nd-Ti microwave dielectric ceramic material with high quality factor. Background technique [0002] In recent years, with the rapid development of mobile communication technology and Internet of Things technology, radio frequency identification technology (radio frequency identification, RFID) develops rapidly. 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, and many of the components need to use microwave dielectric ceramics. Therefore, the microwave dielectric ceramic is the core basic material of the system, and the dielectric constant of the microwave dielectric ceramic material is generally required to be 60-100. With the devel...

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Problems solved by technology

Both have high dielectric constant and Q×f value, but the excessive frequency temperature coefficient hinders the promotion of the two systems in practical applications

CaTi was reported by Zhao Fei et al. 1-x (Mg 1 / 3 Nb 2 / 3 ) x o 3 performance, but the dielectric constant of the obtained material is generally low

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