Method for preparing SBN (Sr0.5Ba0.5Nb2O6) nano-powder with improved sol-gel method
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A technology of barium strontium niobate and nanopowder, which is applied in the direction of nanotechnology, can solve the problems of potential safety hazards, and achieve the effects of easy completion, stable sol, and avoiding highly toxic reagents
Inactive Publication Date: 2016-06-15
ZHEJIANG UNIV
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In the preparation process of this method, it is necessary to use HF solution to d
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Embodiment 1
[0022] To prepare 0.05molSr 0.5 Ba 0.5 Nb 2 o 6 Taking nano powder as an example, the required raw materials are 43.51 grams of niobium oxalate, 3.69 grams of strontium carbonate, 4.93 grams of barium carbonate, 63.36 grams of citric acid, 95.52 grams of ethylene glycol, and 100 ml of ammonia water. The specific operation is as follows:
[0023] 1. Dissolve 43.51 grams of niobium oxalate in 500 ml of deionized water at room temperature, and keep stirring to obtain a clear aqueous solution of niobium oxalate;
[0024] 2. In the prepared niobium oxalate aqueous solution, add 100ml of ammonia water dropwise while stirring to obtain Nb(OH) 5 white precipitate;
[0025] 3. Add Nb(OH) 5 The precipitate was aged in a water bath at 80°C for 12 hours, and after cooling, suction filtration and washing were performed to remove excess ammonia water;
[0026] 4. Dissolve 63.36 grams of citric acid in 100 ml of deionized water to obtain an aqueous solution of citric acid;
[0027] 5...
Embodiment 2
[0033] To prepare 0.04molSr 0.5 Ba 0.5 Nb 2 o 6Taking nano powder as an example, the required raw materials are 34.81 grams of niobium oxalate, 2.95 grams of strontium carbonate, 3.95 grams of barium carbonate, 50.69 grams of citric acid, 76.42 grams of ethylene glycol, and 80 ml of ammonia water. The specific operation is as follows:
[0034] 1. Dissolve 34.81 grams of niobium oxalate in 400 ml of deionized water at room temperature, and keep stirring to obtain a clear niobium oxalate solution;
[0035] 2. In the prepared niobium oxalate aqueous solution, add 80ml of ammonia water dropwise while stirring to obtain Nb(OH) 5 white precipitate;
[0036] 3. Add Nb(OH) 5 The precipitate was aged in a water bath at 80°C for 12 hours, and after cooling, suction filtration and washing were performed to remove excess ammonia water;
[0037] 4. Dissolve 50.69 grams of citric acid in 80 ml of deionized water to obtain an aqueous solution of citric acid;
[0038] 5. Add Nb(OH) 5...
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Abstract
The invention discloses a method for preparing SBN (Sr0.5Ba0.5Nb2O6) nano-powder with an improved sol-gel method. According to the method, Nb(OOCCOOH)5, SrCO3 and BaCO3 are taken as raw materials, ammonia water is taken as a precipitating agent, ethylene glycol is taken as an esterifying agent, and citric acid is taken as a metal complexing agent. A preparation process comprises steps as follows: firstly, Nb(OOCCOOH)5 is dissolved in deionized water, excessive ammonia water is added dropwise, and Nb(OH)5 precipitates are obtained; the precipitates subjected to aging, filtering and washing are dissolved with citric acid, and a Nb-citric acid solution is formed; SrCO3 and BaCO3 are dissolved sequentially, and a uniform and transparent Sr-Ba-Nb-citric acid complex is formed; ethylene glycol is added to the complex finally for a polyesterification reaction; a final precursor is subjected to calcination treatment after vacuum drying, and the SBN nano-powder can be obtained. The process of preparing the SBN nano-powder with the method is not involved with a toxic and highly-corrosive chemical reagent, the operation procedure is simple, the preparation cost is low, and the prepared nano-power can be used for preparing SBN ceramics with an electrocaloric effect.
Description
technical field [0001] The invention relates to the technical field of electric card refrigeration, in particular to a preparation method of a tungsten bronze structure dielectric ceramic nanopowder with a large electric card effect. Background technique [0002] The electric card effect refers to the phenomenon that a cyclic external electric field is applied to a polar material under adiabatic conditions to cause a temperature change (ΔT) and an entropy change (ΔS). Compared with traditional vapor-compression refrigeration, electric card refrigeration has higher refrigeration efficiency, does not produce a large amount of greenhouse gases, and does not require the use of refrigerant Freon. Compared with the magnetic card effect, the advantage of the electric card effect is that the high electric field required to realize the refrigeration cycle is easier to generate than the high magnetic field required by the magnetic card effect refrigeration technology. Barium strontiu...
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