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Barium titanate-based Y5V nano-powder and preparation method for ceramic material thereof

A technology of nano-powder and barium titanate, which is applied in the field of barium titanate-based nano-powder and its preparation, can solve the problems of easy segregation of components in the precipitation method, high sintering temperature, and high electrode cost, and achieves the titanium-barium ratio and the doping ratio. The effect of easy control of impurities, high purity, and high reliability of dielectric properties

Inactive Publication Date: 2010-07-28
NORTHWEST UNIV(CN)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Another object of the present invention is to adopt the sol-gel method to synthesize the above-mentioned nanoscale barium titanate-based Y5V powder in one step, which overcomes the large particle size of the barium titanate-based powder synthesized by the solid-state method, high sintering temperature, high electrode cost, and precipitation. Defects such as easy segregation of legal components

Method used

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  • Barium titanate-based Y5V nano-powder and preparation method for ceramic material thereof
  • Barium titanate-based Y5V nano-powder and preparation method for ceramic material thereof
  • Barium titanate-based Y5V nano-powder and preparation method for ceramic material thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] According to the composition formula:

[0042] (Ba 0.87 Ca 0.09 Sr 0.04 )(Ti 0.86 Zr 0.08 sn 0.06 )O 3 +0.0137molZnO+0.0111molSiO 2 +0.0029molMnO 2 +0.0001molCeO 2 +0.0004molWO 3 +xmolNb 2 o 5 , fixed the content of Zn, Si, Mn, Ce, W, Ca, Sr, Zr, Sn in the sample, changed the amount of Nb doped to 0.0011, 0.0019 and 0.0023, and synthesized barium titanate-based Y5V nanopowder by sol-gel method ( Recorded as #1-1, #1-2 and #1-3) and their ceramic materials (recorded as #1-4, #1-5 and #1-6 in sequence), the specific steps are as follows:

[0043] a) Weigh 44.7881 g of tetrabutyl titanate according to the stoichiometric ratio, add 30 ml of glacial acetic acid and 5 ml of absolute ethanol under stirring, and fully stir;

[0044] b) Add 33.3824g of barium acetate, 1.2762g of strontium nitrate, 2.4270g of calcium acetate, 3.8558g of zirconium oxynitrate, 0.1007g of cerium nitrate, 0.1509g of zinc acetate, 0.0782g of manganese nitrate and 0.4472g of ammonium metat...

Embodiment 2

[0053] According to the composition formula:

[0054] (Ba 0.90 Ca 0.07 Sr 0.03 )(Ti 0.96-x Zr x sn 0.04 )O 3 +0.0137molZnO+0.0111molSiO 2 +0.0029molMnO 2 +0.0001molCeO 2 , fixed the Zn, Si, Mn, Ce, Ca, Sr, Sn content in the sample, changed the Zr content to 0.07, 0.08 and 0.09, and synthesized barium titanate-based Y5V nanopowder by sol-gel method (recorded as #2 -1, #2-2 and #2-3) and ceramic materials thereof (recorded as #2-4, #2-5 and #2-6 successively), calculate the dosage of each substance according to the composition, and the specific steps are with reference to Example 1 .

[0055] Depend on Figure 5 It can be seen from the XRD pattern of the figure that the barium titanate-based nanopowder obtained by sintering at 900 ° C in the figure is composed of a single cubic phase of barium titanate without other impurity phases. from Image 6 The average particle size is estimated to be between 60nm and 80nm from the TEM photos. The SEM photos of ceramic sample...

Embodiment 3

[0059] According to the composition formula:

[0060] (Ba 0.87 Ca 0.09 Sr 0.04 )(Ti 0.90 Zr 0.04 sn 0.06 )O 3 +0.0137molZnO+0.0111molSiO 2 +0.0029molMnO 2 +xCeO 2 , fixed the Zn, Si, Mn, Ca, Sr, Sn, Zr content in the sample, changed the Ce content to 0.0010mol, 0.0015mol and 0.0020mol, and used the sol-gel method to synthesize the barium titanate-based Y5V nanopowder (recorded in turn are #3-1, #3-2, and #3-3) and their ceramic materials (recorded as #3-4, #3-5, and #3-6 in turn), and calculate the dosage of each substance according to the composition. For specific steps, refer to In Example 1, the difference is that the titanate is isopropyl titanate, the organotin is diethyldibutyltin, and the silicate is isopropyl titanate.

[0061] Depend on Figure 9 It can be seen from the XRD pattern of the figure that the barium titanate-based nanopowder obtained by sintering at 1150 ° C in the figure is composed of a single cubic perovskite phase of barium titanate without ...

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Abstract

The invention discloses barium titanate-based Y5V nano-powder, which is characterized in that: the chemical composition of the powder is represented by a general formula: (Ba1-x-ySrxCay)(Ti1-m-nZrmSnn)O3+A, in which x is more than or equal to 0.01 and less than or equal to 0.05; y is more than or equal to 0.06 and less than or equal to 0.10; m is more than or equal to 0.04 and less than or equal to 0.12; n is more than or equal to 0.01 and less than or equal to 0.06; A may be CeO2, ZnO and SiO2; and dielectric ceramic powder comprises 1 to 4 percent of the A in molar percentage. The powder can be sintered into a barium titanate-based Y5V ceramic material with high dielectric property by sintering at the temperature of between 1,250 and 1,300 DEG C and preserving the heat for 0.5 to 8.0 hours. The preparation method has the advantages of homogeneous components, easy control prescription, and good sintering activity of nano-powder and the powder, and can meet the development requirements on the miniaturization, the base metal and the environmental protection of Y5V ceramic capacitors.

Description

technical field [0001] The invention relates to a barium titanate-based nanopowder meeting the Y5V standard and a preparation method thereof. Background technique [0002] In recent years, the development of multilayer ceramic capacitor (MLCC) technology mainly focuses on the high capacity of products, base metallization and miniaturization. Y5V chip MLCC has the advantages of high specific capacity, high cost performance, high reliability, etc., and is widely used in electronic circuits. Barium titanate is non-polluting to the environment, and has excellent mechanical strength, aging resistance and reliability. It is one of the most widely used materials in electronic ceramics. It is an important material for the production of Y5V MLCC. According to the International Electronics Industry Association EIA (Electronic Industries Assocaition) standard, Y5V type MLCC refers to the capacitance value of 25 ℃ as the standard, in the temperature range of -30 ℃ ~ +85 ℃, the temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 崔斌邢祎琳孙芳民畅柱国牛瑞媛
Owner NORTHWEST UNIV(CN)
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