Method for preparing copper titanate bismuth sodium ceramic

A technology of copper bismuth sodium titanate and ceramics, which is applied in the field of preparation of copper bismuth sodium titanate ceramics, which can solve the problems of restricting the production and application of NBCTO ceramics, failing to meet high dielectric requirements, and the difference in dielectric properties, and achieve the effect of expanding interface transfer , increase the interface effect, good compactness effect

Inactive Publication Date: 2015-08-19
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, NBCTO dielectric ceramic materials are usually prepared by solid-state method. The synthesis temperature of this method is relatively high, and it generally requires high-temperature calcination above 900°C for several hours to synthesize relatively pure NBCTO ceramic powder, and the raw material contains CuO is extremely volatile during high-temperature calcination, resulting in a mismatch of the ratio of the elements, and some powders whose elemental composition does not match the theoretical value make the dielectric properties of the sintered NBCTO ceramics vary greatly due to changes in the preparation process. Some products cannot even meet the high dielectric requirements, the yield is low, and the batch is unstable, which greatly limits the actual production and application of NBCTO ceramics.

Method used

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  • Method for preparing copper titanate bismuth sodium ceramic

Examples

Experimental program
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Embodiment 1

[0033] To prepare the general formula Na 0.5 Bi 0.5 Cu 3 Ti 4 o 12 The dielectric ceramic material 6.897 grams of expression is example, used raw material and preparation method thereof are as follows:

[0034] According to the general formula Na 0.5 Bi 0.5 Cu 3 Ti 4 o 12 The stoichiometry of raw materials were weighed Na 2 CO 3 0.265g, Bi 2 o 3 1.165g, CuO 2.387g, TiO 2 3.195g, 0.758g of NaCl, and 0.964g of KCl are mixed evenly, wherein the sum of the mass of NaCl and KCl is 20% of the total mass of the mixture. Put prepared materials into a ball mill jar, add ball milling medium agate balls and dispersing medium absolute ethanol, and mill at a speed of 120 rpm for 6 hours to fully mix them evenly. Separate the agate balls, dry the mixture in a drying oven at 70°C for 24 hours, pulverize it with agate platinum, put it into an alumina crucible, cover it, and calcinate at 700°C for 2 hours to obtain NBCTO ceramic powder containing chloride salts. The NBCTO cer...

Embodiment 2

[0036] To prepare the general formula Na 0.5 Bi 0.5 Cu 3 Ti 4 o 12 The represented dielectric ceramic material 6.897 grams is example, and used raw material and preparation method thereof are consistent with embodiment 1, wherein:

[0037] In the steps of this example, the pressed disc-shaped green body was sintered at 1020 ° C for 8 hours, and the other steps were the same as those in Example 1 to prepare Na 0.5 Bi 0.5 Cu 3 Ti 4 o 12 Giant dielectric ceramic materials. The two bottom surfaces of the sintered sample were made of silver electrodes, and the dielectric properties were tested, such as Figure 4 As shown, at 1KHz, the relative permittivity of NBCTO ceramics is 1.62×10 4 .

Embodiment 3

[0039] To prepare the general formula Na 0.5 Bi 0.5 Cu 3 Ti 4 o 12 The represented dielectric ceramic material 6.897 grams is example, and used raw material and preparation method thereof are consistent with embodiment 1, wherein:

[0040] In the steps of this example, the pressed disc-shaped green body was sintered at 1040°C for 12 hours, and the other steps were the same as those in Example 1 to prepare Na 0.5 Bi 0.5 Cu 3 Ti 4 o 12 Giant dielectric ceramic materials. The two bottom surfaces of the sintered sample were made of silver electrodes, and the dielectric properties were tested, such as Figure 5 As shown, at 1KHz, the relative permittivity of NBCTO ceramics is 1.57×10 4 .

[0041] As can be seen from the above figure, at room temperature, the relative permittivity of the NBCTO ceramics of the present invention can reach 1.4 × 10 at 1KHz. 4 , is superior to the properties of the existing NBCTO ceramics, which proves that the present invention obtains NBCT...

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Abstract

The invention relates to a method for preparing a Na0.5Bi0.5Cu3Ti4O12 ceramic. Na2CO3, Bi2O3, CuO and TiO2 serve as raw materials, NaCl and KCl are added into the raw materials, and the raw materials are ball-milled, pre-burned, formed and sintered to form a product. By the method, the raw materials can react at low temperature, a synthetic product is high in purity and small in grain size and has a great value in the field of high dielectric constant materials, the microscopic structure of the copper titanate bismuth sodium ceramic can be obviously improved, and further dielectric property is improved.

Description

technical field [0001] The invention belongs to the field of ceramic material preparation, and in particular relates to a method for preparing copper bismuth sodium titanate ceramics. Background technique [0002] In recent decades, the microelectronics industry has become an important pillar of the national economy of various countries. The integration, miniaturization and high speed of electronic components are the main driving forces for the development of microelectronics technology, and dielectric materials are the core materials in electronic and microelectronic devices. Since the capacitance is proportional to the dielectric constant, it is desirable that the material has a high dielectric constant. In order to meet the requirements of the circuit application, the dielectric constant of the electrolyte must have a small correlation with the frequency, and at the same time, it is desirable that the material has as small a dielectric constant as possible. The dielectri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 苏艳丽王莹
Owner SUZHOU UNIV
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