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Preparation method of perovskite-like varistor ceramic material CaCu3Ti4O12 with high dielectric constant

A technology of high dielectric constant and pressure-sensitive ceramics, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problems of high energy consumption, large powder particle size, uneven chemical composition of products, etc., and achieve energy consumption Low, reduced energy consumption, and simple reaction equipment

Active Publication Date: 2012-05-02
江苏津沂菊源生物健康产业研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention overcomes the disadvantages of traditional solid-phase method, such as high energy consumption, large particle size, serious agglomeration, and uneven chemical composition of the product due to uneven mixing, in the preparation of CCTO powder by using oxides as raw materials. A relatively low hydrothermal method to obtain perovskite-like CaCu with a pure phase perovskite structure and uniform particle size with high dielectric properties 3 Ti 4 o 12 Powder and pressure sensitive ceramics

Method used

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  • Preparation method of perovskite-like varistor ceramic material CaCu3Ti4O12 with high dielectric constant
  • Preparation method of perovskite-like varistor ceramic material CaCu3Ti4O12 with high dielectric constant
  • Preparation method of perovskite-like varistor ceramic material CaCu3Ti4O12 with high dielectric constant

Examples

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Embodiment 1

[0029] 1. CaCu 3 Ti 4 O 12 Preparation of powder

[0030] (1) 2.3139g of tetrabutyl titanate was slowly dropped into ethanol to obtain an ethanol solution with a concentration of 0.1 mol / L, 1.2378g of copper nitrate and 0.4066g of calcium nitrate were dissolved into an aqueous solution and added to the mixture under stirring. In the tetrabutyl titanate ethanol solution, the pH of the solution is adjusted to 5 with ammonia water, and then 5 mL of 6 mol / L mineralizer sodium hydroxide is added, and the resulting solution is fully mixed;

[0031] (2) Stir the mixed solution evenly and seal it in the autoclave with a filling degree of 60% (volume fraction), keep it at 180°C for 12h, and let it cool to room temperature naturally;

[0032] (3) filter the precipitate obtained in step (2) with suction, fully wash it with deionized water and ethanol to remove impurities, and finally dry it in a vacuum drying oven at 100° C. for 2 hours, take it out and grind it in an agate mortar to ...

Embodiment 2

[0038] In this example, the hydrothermal method was used to prepare CaCu 3 Ti 4 O 12 When powder, the weight of each component is the same as in Example 1, the pH value of the solution is adjusted to 8 with ammonia water, 5 mL of mineralizer sodium hydroxide with a concentration of 8 mol / L is added, the reaction temperature is 200 ° C, and the reaction time is 12 h. Using the same process steps as in Example 1, CaCu with giant dielectric properties was prepared 3 Ti 4 O 12 Pressure-sensitive ceramics, the difference is that the ceramic sintering temperature is 950 °C.

Embodiment 3

[0040] In this example, the hydrothermal method was used to prepare CaCu 3 Ti 4 O 12 When powder, the weight of each component is the same as in Example 1, the pH value of the solution is adjusted with ammonia water at 11, the concentration of the mineralizer sodium hydroxide is 10mol / L, the reaction temperature is 160 ° C, and the reaction time is 24h. The above materials are used and implemented. Example 1 The same process steps were used to prepare CaCu with giant dielectric properties 3 Ti 4 O 12 Pressure-sensitive ceramics, the difference is that the ceramic sintering temperature is 950 °C.

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Abstract

Belonging to the technical field of preparation and application of electronic ceramics, the invention relates to a preparation method of a perovskite-like varistor ceramic material CaCu3Ti4O12 (CCTO) with a high dielectric constant. With nitrates of Cu and Ca as well as Ti (OC4H9)4 as starting materials, the method of the invention combines a hydrothermal method for preparing nanometer CCTO powder so as to prepare high performance CCTO varistor ceramics, thus realizing the purposes of lowering temperature, and improving varistor as well as dielectric properties.

Description

technical field [0001] The invention relates to a kind of high dielectric constant perovskite type CaCu 3 Ti 4 O 12 A preparation method of a pressure-sensitive ceramic material belongs to the technical field of electronic ceramic preparation and application. Background technique [0002] CaCu 3 Ti 4 O 12 (referred to as CCTO) varistor ceramic material is a perovskite-like structure, which is a new type of material with a huge dielectric constant discovered in recent years. CCTO has excellent electrical properties, including an abnormal giant dielectric constant (ε≈10 4 ~10 5 ) and low dielectric loss (tanδ≈0.03), especially in a wide temperature range (100~400K) near room temperature, the dielectric constant value is almost unchanged, indicating that it has good thermal stability. At the same time, CCTO has Certain current-voltage nonlinear varistor characteristics, and the excellent capacitance-varistor comprehensive properties of CCTO materials may become a new typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C04B35/462C04B35/622
Inventor 王茂华王秋丽李刚姚超
Owner 江苏津沂菊源生物健康产业研究院有限公司
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