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
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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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