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

A microwave dielectric ceramic and microwave technology, which is applied in the field of preparation of high-quality factor Ca-Nd-Ti microwave dielectric ceramic materials, can solve the problems of low dielectric constant of materials, frequency temperature coefficient hindering promotion, etc., and achieve high dielectric constant, Inexpensive and stable performance

Active Publication Date: 2015-11-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

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 app

Method used

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

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Embodiment

[0035] A microwave dielectric ceramic material substituted by B site, the general chemical formula is Ca 0.61 Nd 0.26 (Ti 1-x C x )O 3 , C=MN, where 0.15≤x≤0.2, the purpose of controlling the microwave performance of the system is achieved by replacing the B position, and the value of x is adjusted to control the microwave performance of the system; M represents Nb with a higher valence than tetravalent, and N represents a low valence For one or several other elements that are tetravalent and have an ionic radius similar to Ti, M and N can be substituted simultaneously or individually.

[0036] N is one or more of Zn, Co, Ni, Mg, Al, Cr. When MN is substituted at the same time, if N is Al, Cr, then the molar ratio N:M=1:1, if N is one or more of Zn, Co, Ni, Mg, then the total molar ratio N: M=1:2.

[0037] The crystal phase of the microwave dielectric ceramic material is a perovskite structure.

[0038] The Q×f value of the microwave dielectric ceramic material is betwe...

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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...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/622
Inventor 唐斌陈鹤拓孙成礼钟朝位张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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