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Method for preparing (Ca, Nd) TiO3 microwave dielectric ceramic by adopting sol-gel method

A technology of microwave dielectric ceramics and gel method, which is applied in the field of material science, can solve the problems of reducing additives, etc., and achieve the effect of simple equipment, stable process and ensuring homogeneity

Active Publication Date: 2009-12-30
ZHEJIANG UNIV
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Problems solved by technology

So far, there is no introduction of HBO in the preparation of ceramics by sol-gel method 3 -Cu(NO 3 ) 2 -LiNO 3 Additives further reduce (Ca 0.61 ,Nd 0.26 )TiO 3 Report on powder synthesis and sintering temperature

Method used

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  • Method for preparing (Ca, Nd) TiO3 microwave dielectric ceramic by adopting sol-gel method
  • Method for preparing (Ca, Nd) TiO3 microwave dielectric ceramic by adopting sol-gel method

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Embodiment 6

[0029] Embodiment 6, x=1.19, y=0.15, z=0.32 group point can obtain particle diameter 10~15nm, the superfine (Ca 0.61 ,Nd 0.26 )TiO 3 powder (such as figure 1 ), the powder can be sintered at 1100°C to obtain dense nanocrystals (Ca 0.61 ,Nd 0.26 )TiO 3 ceramics (such as figure 2 ), ceramics have the best microwave dielectric properties: ε r is 89.53, Q×f is 17148GHz, τ f =+239ppm / ℃, can be used in the design and production of miniature multi-layer frequency devices such as capacitors, antennas, baluns, and various filters.

[0030] Table 1.

[0031] implement

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Abstract

The invention discloses a method for preparing (Ca, Nd) TiO3 microwave dielectric ceramic by adopting a sol-gel method. The method selects neodymium nitrate, calcium nitrate and tetrabutyl titanate as raw materials, selects boric acid, copper nitrate and lithium nitrate as a sintering additive, adopts the sol-gel method to obtain sol precursors which are mixed evenly on molecular level, leads the following crystalline phase forming to be easier and leads the temperature of crystalline phase forming to be reduced, thus obtaining the (Ca, Nd) TiO3 microwave dielectric ceramic with narrow granularity and particle size of 10 to 20nm. The powder leads the ceramic to be sintered compactly under low temperature of 1100 DEG C due to nano small size effect and sintering additive synergy, and keeps excellent microwave dielectric ceramic. The method has simple needed equipment, no particular environment requirements, stable technique under normal temperature and strong repeatability. The method can be used for preparing miniature multilayer frequency device designs of capacitors, antennas, Baran and various filters and the like and has extreme large industrial application value.

Description

technical field [0001] The invention relates to a method for preparing high-permittivity microwave dielectric ceramics used in microwave components, in particular to a low-temperature preparation of (Ca, Nd)TiO by a sol-gel method 3 The invention relates to a preparation method of microwave dielectric ceramics, which belongs to the field of material science. technical background [0002] (Ca,Nd)TiO 3 Due to its excellent dielectric properties, microwave dielectric ceramics have attracted widespread attention and are considered to be a high dielectric constant microwave ceramic material with great application value. Currently, (Ca, Nd)TiO 3 The preparation of microwave dielectric ceramics generally adopts the traditional solid-phase method (references: Yoshida M, Hara N, Takada T, "Structure and Dielectric Properties of (Ca 1-x Nd 2x / 3 )TiO 3 "[J].Japanese Journal of Applied Physics, 1997,36(11):6818~6823), the required calcination temperature of this method is high (110...

Claims

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Application Information

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IPC IPC(8): C04B35/624C04B35/46H01B3/12
Inventor 张启龙吴飞杨辉
Owner ZHEJIANG UNIV