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Preparation method of lanthanum niobate nano powder
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A technology of nano-powder and lanthanum niobate, which is applied in the field of ceramic compositions, can solve the problem of high sintering temperature of ceramics, and achieve the effect of no pollution in the process and simple experimental conditions
Inactive Publication Date: 2018-11-23
TIANJIN UNIV
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[0003] The purpose of the present invention is to overcome the existing traditional solid-phase method to prepare LaNbO 4 The shortcomings of ceramic sintering temperature are too high, using niobium oxalate, lanthanum nitrate, and citric acid as the main raw materials of sol-gel method to prepare nano-sized lanthanum niobate microwave dielectric ceramic powder
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Embodiment 1
[0023] (1) With high purity niobium oxalate (C 10 h 5 NbO 20 ) as a raw material, add deionized water, and heat in a water bath at 85°C until the niobium oxalate is completely dissolved;
[0024] (2) Add ammoniacal liquor dropwise to the solution of step (1), fully stir, adjust the pH of the solution to 9, and a milky white precipitate occurs;
[0025] (3) the milky white precipitate obtained in step (2) is suction-filtered and cleaned with deionized water;
[0026] (4) Put the cleaned precipitate obtained in step (3) into a citric acid solution, heat in a water bath at 85°C until the precipitate is completely dissolved, and obtain a clear and transparent niobium citrate sol, wherein the molar weight of citric acid is Nb 5+ 5 times that of ions;
[0027] (5) Lanthanumnitrate (La(NO 3 ) 3 ·6H 2 O) be dissolved in citric acid solution, fully stir, obtain clear and transparent lanthanum citrate sol, wherein, citric acid molar weight is La 3+ 5 times;
[0028] (6) Accord...
Embodiment 2
[0033] (1) With high purity niobium oxalate (C 10 h 5 NbO 20 ) as a raw material, add deionized water, and heat in a water bath at 85°C until the niobium oxalate is completely dissolved;
[0034] (2) Add ammoniacal liquor dropwise to the solution of step (1), fully stir, adjust the pH of the solution to 9, and a milky white precipitate occurs;
[0035] (3) the milky white precipitate obtained in step (2) is suction-filtered and cleaned with deionized water;
[0036] (4) Put the cleaned precipitate obtained in step (3) into a citric acid solution, heat in a water bath at 85°C until the precipitate is completely dissolved, and obtain a clear and transparent niobium citrate sol, wherein the molar weight of citric acid is Nb 5+ 5 times that of ions;
[0037] (5) Lanthanumnitrate (La(NO 3 ) 3 ·6H 2 O) be dissolved in citric acid solution, fully stir, obtain clear and transparent lanthanum citrate sol, wherein, citric acid molar weight is La 3+ 5 times;
[0038] (6) Accord...
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Abstract
The invention discloses a preparation method of lanthanum niobate microwavedielectricceramic nano powder. The preparation method comprises the following steps: with niobium oxalates as a raw material, heating in a water bath until niobium oxalates is completely dissolved, adjusting the pH value of the solution to 8-10, carrying out suction filtration and cleaning milky white precipitates, and heating in the water bath for dissolving the precipitates in citric acid to obtain niobium citrate sol; further dissolving lanthanumnitrate in a citric acid solution to obtain lanthanum citrate sol (the molar amount of citric acid is 3 to 5 times the total molar amount of metal ions); fully stirring and mixing the niobium citrate sol and the lanthanum citrate sol according to the chemical formula LaNbO4, and adding ethylene glycol monomethyl ether (the molar amount of which is 2 to 4 times that of citric acid in the solution) as a stabilizer; evaporating water in the mixed sol and self-burningto obtain precursor powder, calcining at 650 to 750 DEG C to obtain the white LaNbO4 nano powder. The preparation method can be used to successfully obtain a lanthanum niobate microwavedielectricceramic powder raw material with particle size of 40 to 80 nm, the preparation process is simple and free of pollution, and lanthanum niobate microwavedielectricceramic with high performance can be obtained at a low temperature in the future.
Description
technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a preparation process of lanthanum niobate nanoscale ceramic powder. Background technique [0002] The main development direction of portable terminals in the future is light weight, miniaturization, high frequency and multi-function, so there are higher requirements for the material performance of microwave IC devices. Microwavedielectric ceramics are generally used as dielectric materials in microwave frequency band circuits, which can realize one or more functions, and are key materials for making microwave circuits and components. Usually, in the process of preparing microwave dielectric ceramics by the traditional solid-state method, the sintering temperature is relatively high, which makes the experimental conditions relatively harsh. In order to enable microwave ceramics to obtain similar properties at low temperatures, the present invention adopts a s...
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