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A kind of (srca)tio3-laalo3 based microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and base materials, which is applied in the field of microwave dielectric ceramic materials and high quality factor microwave dielectric ceramic materials, can solve the problems of poor performance of microwave dielectric ceramics, the requirement of high sintering temperature, and the increase of sintering equipment, etc. The effect of improving, stable performance and excellent microwave dielectric properties

Inactive Publication Date: 2015-08-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In 2001, Huang CL et al. published "Increasing 0.5SrTiO at low sintering temperature" on "Materials Research Bulletin". 3 -0.5LaAlO 3 Quality Factor of Microwave Ceramics (Improved high Q value of0.5LaA1O 3 -0.5SrTiO 3 Microwave dielectric ceramics at low sintering), when mixed with 0.25%-1%wt of B 2 o 3 , 0.5LaAlO 3 -0.5SrTiO 3 The sintering temperature of the ceramic is reduced to 1430°C, but its dielectric properties are relatively poor, and the addition of a large amount of glass phase leads to the deterioration of microwave properties.
Through XPS analysis, it is concluded that the reason for this phenomenon is that SrTiO 3 -LaAlO 3 Ceramics will be semiconducted, and the mechanism is Ti 4+ → Ti 3+ , resulting in oxygen vacancies, resulting in poor performance of microwave dielectric ceramics
Ceramics with high-quality microwave dielectric properties can be used in O 2 obtained by sintering in an atmosphere, but the required conditions increase the requirements for sintering equipment and higher sintering temperature, which makes the popularization of practical ceramics encounter great resistance

Method used

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  • A kind of (srca)tio3-laalo3 based microwave dielectric ceramic material and preparation method thereof
  • A kind of (srca)tio3-laalo3 based microwave dielectric ceramic material and preparation method thereof
  • A kind of (srca)tio3-laalo3 based microwave dielectric ceramic material and preparation method thereof

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Embodiment 1～10

[0028] The concrete implementation steps that make these embodiment microwave dielectric ceramics are as follows:

[0029] (1) Synthesis of base material: SrCO with purity ≥ 99% 3 , CaCO 3 , La 2 o 3 、Al 2 o 3 and TiO 2 As a raw material, according to the chemical composition formula (1-x)Sr (1-y) Ca y TiO 3 -xLaAlO 3 (wherein 0.40≤x≤0.50, 0.05≤y≤0.20) molar ratio is carried out batching, and specific formula is shown in Table 1; Put the above-mentioned mixed material into the nylon ball mill jar, and use zirconium ball as grinding ball, in the past Ionized water is used as the ball milling medium, the ratio of the added material to the zirconium ball is 1:5, and the ball milling time is 5 to 8 hours. After the ball milling, the slurry is taken out and dried at 100°C and passed through a 60-mesh sieve to obtain Primary ball grinding material, pre-calcining the primary ball grinding material at a temperature of 1250 ° C to 1350 ° C for 3 to 5 hours to obtain a pre-fir...

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Abstract

The invention discloses a (SrCa)TiO3-LaAlO3-based microwave dielectric ceramic material and a preparation method thereof and belongs to the technical field of electronic information functional materials. The (SrCa)TiO3-LaAlO3-based microwave dielectric ceramic material comprises a base material and additives. The base material is (1-x)Sr(1-y)CayTiO3-xLaAlO3, x is greater than or equal to 0.40 and is less than or equal to 0.50 and y is greater than or equal to 0.05 and is less than or equal to 0.20. The additives comprise B2O3, Co2O3, MnO and CeO2. A main crystalline phase formed from the base material is a composite perovskite SrTiO3-LaAlO3 phase. A sintering temperature in air is in a range of 1530-1580 DEG C. A Q*f value is in a range of 45000-55000GHz. A relative dielectric constant is in a range of 35-43. A resonant frequency temperature coefficient is + / -10ppm / DEG C. The (SrCa)TiO3-LaAlO3-based microwave dielectric ceramic material is prepared by the traditional solid-phase ceramic synthesis technology, has the advantages of cheap raw materials, environmental friendliness and low cost, and is convenient for batch production and application popularization.

Description

technical field [0001] The invention belongs to the technical field of electronic information functional materials, and relates to microwave dielectric ceramic materials, in particular to microwave dielectrics with high quality factor that can be used to make microwave communication components such as dielectric resonators, dielectric filters, dielectric substrates, and dielectric antennas in modern communication technology. Ceramic material. Background technique [0002] In recent years, with the rapid development of microwave communication technology, microwave dielectric ceramics are more and more widely used in circuits, such as resonators, filters, dielectric antennas, microwave integrated circuit substrates and other components made of microwave dielectric materials. Widely used in mobile communication, satellite communication, global satellite positioning system (GPS) and other communication equipment. As a result, higher requirements are put forward for the performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/47C04B35/50C04B35/622
Inventor 唐斌李颖翔周晓华钟朝位张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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