Method for preparing sodium bismuth copper lanthanum titanate dielectric material based on sol-gel method

A sol-gel method and dielectric material technology, which is applied in the synthesis field of copper lanthanum bismuth sodium titanate ceramic materials, can solve the problems of high sintering temperature, poor uniformity and low purity of ceramic powder, and achieve lower sintering temperature and lower The effect of raw material cost and excellent dielectric properties

Inactive Publication Date: 2018-01-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most commonly used method for synthesizing ceramic powder is the solid phase method, which is low in cost, simple in equipm

Method used

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  • Method for preparing sodium bismuth copper lanthanum titanate dielectric material based on sol-gel method
  • Method for preparing sodium bismuth copper lanthanum titanate dielectric material based on sol-gel method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Prepare solution 1: Measure 55ml of ethylene glycol with a dry measuring cylinder and a beaker, then add about 5ml of acetylacetone to the ethylene glycol, finally add 40.8386g of butyl phthalate and 5.8206g of bismuth nitrate pentahydrate, and stir uniform.

[0023] (2) Preparation solution 2: Take by weighing 1.2990g of lanthanum nitrate hexahydrate, 1.2749g of sodium nitrate and 21.7442g of copper nitrate trihydrate according to the stoichiometric ratio, and dissolve them in citric acid aqueous solution (weigh 20.1730g of citric acid and dissolve them in about 50ml of Ionized water), heated at 80°C with magnetic stirring to evaporate water for about 4 hours, and added to the above solution, stirred evenly to obtain a uniform sol.

[0024] (3) Heat the sol in a water bath at 85°C for 8 hours to fully react to obtain a gel;

[0025] (4) Put the gel at 300° C. to undergo a self-propagating combustion reaction to obtain copper lanthanum bismuth sodium titanate nanop...

Embodiment 2-5

[0030] In Example 2-5, except that the sintering temperature and the self-propagating combustion temperature are different, other process conditions are the same as in Example 1. The main process parameters and their dielectric properties are shown in Table 1.

[0031] Test method and detection equipment of the present invention are as follows:

[0032] Dielectric performance test (AC test signal: frequency 20Hz ~ 1MHz, voltage 1V)

[0033] Use TH2828S 1MHz Tonghui Precision LCR digital bridge to test the capacitance C and loss tanδ of the sample, and calculate the dielectric constant of the sample. The calculation formula is:

[0034]

[0035] Table 1

[0036]

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Abstract

The invention discloses a method for preparing sodium bismuth copper lanthanum titanate dielectric material based on a sol-gel method. The method comprises the following steps of firstly, preparationof a solution 1: dissolving butyl titanate and bismuth nitrate into ethylene glycol according to a molar ratio of 10:1 under the condition of adding acetylacetone as a stabilizer, wherein the volume ratio of the ethylene glycol to the butyl titanate to the acetylacetone is 10:10:1; then, preparation of a solution 2: dissolving lanthanum nitrate, sodium nitrate and copper nitrate into a water solution of citric acid when the molar ratio of Na (sodium), Bi (mismuth), La (lanthanum) to Cu (copper) to Ti (titanium) is 5:4:1:30:40, wherein the mass ratio of citric acid to water is 1:2; evaporatingthe water at the temperature of 80 DEG C until the volume of the solution is not changed; mixing the solution 1 and the solution 2, so as to obtain gel; performing self-propagation combustion reactionon the gel at the temperature of 300 to 450 DEG C, so as to obtain the sodium bismuth copper lanthanum titanate nanometer powder material; after the powder is granulated, pressing into a blank, and sintering the blank at the temperature of 950 to 1000 DEG C, so as to obtain the sodium bismuth copper lanthanum titanate material. The method has the advantages that the dielectric loss tan-sigma is lower and is 0.04, and the huge dielectric constant epsilon is 9.01*10<4> at the temperature of 25 DEG C; the cost of the raw material is low, and the sintering temperature of the ceramic is effectively reduced.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a copper lanthanum bismuth sodium titanate ceramic material (Na 0.5 Bi 0.4 La 0.1 Cu 3 Ti 4 o 12 ) synthesis method. Background technique [0002] In recent decades, the microelectronics industry has become an important pillar of the national economy of various countries. Throughout the development process of microelectronics technology, the integration, miniaturization and high speed of electronic components are the main driving forces for the development of microelectronics technology. Dielectric materials are the core materials in electronic and microelectronic devices, such as dynamic random access memory (DRAM) and multilayer ceramic capacitor (MLCC), etc. Therefore, high dielectric constant materials have become the Materials with great application potential in these fields. In the past decade, some non-ferroelectric materials with huge dielectric...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/626C04B35/622
Inventor 李玲霞李江腾张宁蔡朝阳
Owner TIANJIN UNIV
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