Method for preparing copper titanate calcium-based ceramic with core-shell structure
A technology of calcium copper titanate and shell structure is applied in the field of preparation of calcium copper titanate-based ceramics, which can solve the problems of low-frequency dielectric constant reduction of CCTO ceramics, and achieve the advantages of reducing dielectric loss, increasing insulation and improving oxidation degree. Effect
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[0011] To analyze pure calcium nitrate (Ca(NO 3 ) 2 • 4H 2 O, 99%), copper nitrate (Cu(NO 3 ) 2 •3H 2 O, 99%) and tetrabutyl titanate ([CH 3 (CH 2 ) 3 O] 4 Ti, 99%) as the initial raw material, adding citric acid (C 6 h 8 o 7 , 99%), the CCTO precursor powder was prepared by the sol-gel method, first according to the CaCu 3 Ti 4 o 12 The stoichiometric ratio of various raw materials is accurately weighed, then dissolved in ethanol and mixed evenly, and the pH of the solution is only adjusted to 2~3 with nitric acid. After the solution was stirred by magnetic force, it was placed in a constant temperature of 80°C and incubated for 6 hours to make the solution form a colloid, and then kept in a constant temperature of 100°C for 2 hours to become a xerogel. The xerogel was calcined in the atmosphere at 750°C for 2 hours to obtain CCTO powder. Next follow CCTO / xMgTiO 3 (x=0, 0.5, 1 and 2) stoichiometric ratio Accurately weigh CCTO powder, magnesium nitrate (Mg(NO ...
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