Mg-Nb doped bismuth titanate microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and bismuth titanate, which is applied in the field of microwave dielectric ceramics

Active Publication Date: 2016-10-12
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for Mg-Nb simultaneously doped with Bi 4 Ti 3 o 12 Ceramics have not been studied in the microwave frequency range, and the applicant explored the influence of Mg-Nb doping modification on it at the same time

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  • Mg-Nb doped bismuth titanate microwave dielectric ceramic and preparation method thereof
  • Mg-Nb doped bismuth titanate microwave dielectric ceramic and preparation method thereof
  • Mg-Nb doped bismuth titanate microwave dielectric ceramic and preparation method thereof

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Embodiment Construction

[0029] Raw material Bi used in the present invention 2 o 3 , TiO 2 ,(MgCO 3 ) 4 ·Mg(OH) 2 ·5H 2 O and Nb 2 o 5 All are commercially available chemically pure raw materials (mass purity ≥ 99%). The microwave dielectric ceramic material with good comprehensive properties is prepared by the traditional method, that is, the solid-state reaction mixing method and sintering at atmospheric pressure.

[0030] The preparation method of the present invention is as follows:

[0031] (1) Ingredients

[0032] Raw material Bi 2 o 3 , TiO 2 ,(MgCO 3 ) 4 ·Mg(OH) 2 ·5H 2 O and Nb 2 o 5 by Mg x Bi 4-x Ti 3-x Nb x o 12 , the stoichiometric ratio of x=0.1~0.4 in the formula, put it into the ball mill tank after mixing, the ball milling medium is deionized water and zirconia balls, the weight ratio of balls:material:deionized water is 2:1:0.6 ; The ball milling time is 6 hours, and the rotating speed of the ball mill is 750 rpm; then the mixture is put into an oven and drie...

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Abstract

The invention discloses Mg-Nb doped bismuth titanate microwave dielectric ceramic. The chemical formula of the Mg-Nb doped bismuth titanate microwave dielectric ceramic is MgxBi[4-x]Ti[3-x]NbxO12, wherein x ranges from 0.1 to 0.4. A preparation method comprises the steps that the raw materials of Bi2O3, TiO2, (MgCO3)4.Mg(OH)2.5H2O and Nb2O5 are mixed according to the stoichiometric ratio of MgxBi[4-x]Ti[3-x]NbxO12 of which the x ranges from 0.1 to 0.4 and ball-milled for 6 h, drying is conducted at 90 DEG C, and grinding and sieving are conducted; synthesis is conducted at 800 DEG C, secondary ball milling is conducted for 12 h, drying, grinding and sieving are conducted, 7 wt% of polyvinyl alcohol water solution is additionally added for granulation, compression column homogenization is conducted, mashing, grinding and sieving are conducted, and compression molding is conducted to form a green body, the green body is subjected to heat preservation for 1 h at 650 DEG C, and organic matter eliminating is conducted; sintering is conducted at 1,000 DEG C to 1,100 DEG C, and the Mg-Nb doped bismuth titanate microwave dielectric ceramic is obtained. According to the Mg-Nb doped bismuth titanate microwave dielectric ceramic and the preparation method thereof, the Mg-Nb doped bismuth titanate microwave dielectric ceramic with a high dielectric constant is obtained at low sintering temperature, dielectric loss of bismuth titanate is reduced, the product performance is improved, the best sintering temperature is 1,050 DEG C, epsilon r equals to 125, and Q*f equals to 632 GHz.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by composition, in particular to a Mg-Nb doped Bi 4 Ti 3 o 12 System of microwave dielectric ceramics. Background technique [0002] Microwave dielectric ceramics are a new type of functional ceramic material developed in the past twenty years. It refers to the ceramic material used as a dielectric material in microwave frequency (mainly 300MHz ~ 30GHz frequency band) circuits and performs one or more functions. It is a key material for the manufacture of microwave dielectric filters and resonators. Research has been very active in recent years. . All kinds of high-performance devices made of microwave dielectric ceramic materials have been widely used in many fields such as satellite TV, radar, mobile communication, electronic computer and modern medicine. In order to adapt to the rapid development of mobile communication and satellite communication, more and more attention has been pai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
CPCC04B35/475C04B35/622C04B2235/3206C04B2235/3251C04B2235/656C04B2235/96
Inventor 马卫兵臧向荣李娜王燕云尤博仟
Owner TIANJIN UNIV
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