Titanium dioxide-based composite ceramic dielectric material, and preparation method and application thereof

A technology of titanium dioxide and composite ceramics, which is applied in the field of composite ceramic materials, can solve the problems of unfavorable practical application of comprehensive dielectric performance indicators of titanium dioxide ceramics and strontium titanate ceramics, and achieve enhanced electric field strength Eb, enhanced electric field strength, and accelerated crystallization. The effect of particle homogenization

Inactive Publication Date: 2015-04-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the problem that the comprehensive dielectric performance index of single-phase modified titanium dioxide ceramics and strontium titanate ceramics is not conducive to practical application, and provides a class of titanium dioxide-based composite ceramic dielectric materials with good comprehensive dielectric properties

Method used

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  • Titanium dioxide-based composite ceramic dielectric material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A titanium dioxide-based composite ceramic dielectric material, the chemical formula is as follows:

[0035] 0.15SrTiO 3 ―0.85 (In 0.50 ,Nb 0.50 ) 0.01 (TiO 2 ) 0.99 .

[0036] The preparation method of the above-mentioned titanium dioxide-based composite ceramic dielectric material adopts carbonate SrCO of analytical purity respectively. 3 (99.0%), oxide TiO 2 (99.8%), In 2 o 3 (99.0%) and Nb 2 o 5 (99.8%) as a raw material, a titanium dioxide-based composite ceramic sample was prepared using a traditional solid-state reaction process, the steps are as follows:

[0037] (1) Chemical expression of SrTiO by composition 3 The stoichiometric ratio of SrCO 3 and TiO 2 , after mixing, it is ball milled and dried, and then pre-fired at 1250°C for 3 hours to make the raw materials fully react; then ball milled and dried to obtain SrTiO 3 ceramic powder;

[0038] (2) Chemical expression by composition (In 0.50 ,Nb 0.50 ) 0.01 (TiO 2 ) 0.99 The stoichiometri...

Embodiment 2

[0042] A titanium dioxide-based composite ceramic dielectric material, the chemical formula is as follows:

[0043] 0.15SrTiO 3 ―0.85 (In 0.50 ,Nb 0.50 ) 0.01 (TiO 2 ) 0.99 .

[0044] The preparation method is as described in Example 1, except that the sintering time in step (4) is 10 h.

Embodiment 3

[0046] A titanium dioxide-based composite ceramic dielectric material, the chemical formula is as follows:

[0047] 0.05SrTiO 3 ―0.95 (In 0.50 ,Nb 0.50 ) 0.01 (TiO 2 ) 0.99 .

[0048] The preparation method is as described in Example 1, except that the ratio of raw materials is different.

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Abstract

The invention relates to a titanium dioxide-based composite ceramic dielectric material, and a preparation method and an application thereof. The chemical formula of the material is xSrTiO3-(1-x)A, wherein x is 0.03-0.40; A is codoped modified titanium dioxide, and the chemical expression of the codoped modified titanium dioxide is (B,C)y(TiO2)1-y; B is an element with the ionic valence of +5, and C is an element with the ionic valence of +3 or +2; a molar ratio of B to C is determined according to the electric neutrality principle of the ceramic material; and y is 0.005-0.15. The titanium dioxide-based composite ceramic dielectric material has large relative dielectric constant epsilon r, high electric field resistance Eb and other excellent comprehensive dielectric properties, and can adapt to high performance and miniaturization requirements of capacitors, resonators, filters, memories and other electronic products.

Description

technical field [0001] The invention relates to a titanium dioxide-based composite ceramic dielectric material and its preparation method and application, in particular to a titanium dioxide-based composite ceramic dielectric material characterized by high dielectric constant and strong resistance to breakdown electric field and its application in electronic products. It belongs to the technical field of composite ceramic materials. technical background [0002] High dielectric oxide materials are an important basis for capacitive devices to achieve large capacity and size miniaturization, so they have received more and more attention. Traditionally, the relative permittivity ε r High-k dielectric oxide materials greater than 1000 can be roughly divided into two categories. One type is ferroelectric or ferroelectric relaxor perovskite oxides, such as BaTiO 3 , Pb(Mg 1 / 3 Nb 2 / 3 )O 3 Wait. The high dielectric properties of such materials are closely related to the elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46C04B35/622
Inventor 张家良张晓晨
Owner SHANDONG UNIV
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