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Barium strontium titanate thick film and preparation method thereof
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A barium strontium titanate and thick film technology, applied in the field of materials, can solve the problems of small volume, difficulty in generating heat storage, troublesome design of electric card devices, etc., and achieve the effects of uniform grain size, good electric card effect and energy storage performance
Inactive Publication Date: 2018-05-04
GUANGDONG UNIV OF TECH
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[0003] Since the breakdown electric field of the dielectric material is inversely proportional to its thickness, it is difficult for the bulk ferroelectric material to withstand a high electric field (generally less than 10MV / m) and it is difficult to obtain a large electric card effect and energy storage density; thin film materials are due to their good Under high external electric field, it can produce a relatively large electric card effect, but because the thin film material has a substrate, it brings considerable trouble in the design of electric card devices, and the thin film material has a small thickness (≤2μm) leads to its small volume, it is difficult to generate large heat storage
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[0025] The invention provides a method for preparing a barium strontium titanate thick film, comprising the following steps:
[0027] B) drying the mixture, sieving, pre-sintering and secondary ball milling to obtain barium strontium titanate powder;
[0028] C) mixing the barium strontium titanate powder, a dispersant, a binder, a plasticizer and a solvent to obtain a slurry, and casting the slurry to obtain a thick green film;
[0029] D) Sintering the thick green film after warm isostatic pressing to obtain a thick barium strontium titanate film.
[0031] Among them, the present invention according to Ba 0.7 Sr 0.3 TiO 3 The stoichiometric ratio of barium carbonate, strontium carbon...
Embodiment 1
[0057] 1) Weigh barium carbonate (BaCO 3 , Aladdin, purity 0.99) 27.9774g, strontium carbonate (SrCO 3 , Aladdin, purity 0.99) 8.9473g, titanium dioxide (TiO 3 , Aladdin, purity 0.99) 16.1354g was placed in a ball milljar, added 220ml alcohol and zirconium balls, ball milled and mixed on a planetary ball mill for 12 hours, then dried in a 70°C drying oven for 24 hours, ground, and sieved.
[0058] 2) Put the sieved mixed powder into an aluminacrucible, put it into a box furnace, calcinate at 1200°C for 3 hours, and analyze it with an X-raydiffractometer to synthesize barium strontium titanate powder without impurities. see results image 3 , image 3 It is the XRD pattern of barium strontium titanate powder.
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technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a barium strontium titanate thick film and a preparation method thereof. Background technique [0002] Bariumstrontium titanate is a ferroelectric material. The material has excellent dielectric and ferroelectric properties, and is widely used in devices such as dynamic random access memory, bolometer for infrared detection, and multilayer ceramic capacitors. Bariumstrontium titanate also has a high pyroelectric coefficient. Because the electric card effect and the pyroelectric effect are a pair of reversible effects. Then, since barium strontium titanate has a good pyroelectric effect, it should have a high electric card effect at the same time, that is, when an electric field is applied to the barium strontium titanate ferroelectric material under adiabatic conditions, and then the electric field is removed, its temperature will be will decrease. In addition...
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