Process for hydro-thermally synthesizing Y2O3 strontium titanate ceramic powder at normal atmosphere
A technology of yttrium trioxide and strontium titanate is applied in the field of preparation of multifunctional electronic ceramic materials - titanate ceramic powder, which can solve the problems of fluctuating chemical composition, high production cost, low cost, etc. The effect of good quality stability and reproducibility, short preparation cycle and low production cost
Inactive Publication Date: 2005-10-19
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology
The solid phase calcination method is difficult to ensure the uniformity of the material. The high temperature thermal oxidation process in the process is easy to cause the loss of the diffusing agent, and the amount of diffusion is not easy to control. The obtained powder has high impurity content, fluctuating chemical composition, large particle size, and wide particle size distribution. The sintering temperature is high, and flux must be used to reduce the sintering temperature
Although there are reports of improved methods, the obtained powders still cannot meet the requirements for the production of high-performance electronic components.
In the liquid phase method, the powder obtained by the oxalic acid co-precipitation method has high purity and small particle size, but the process is complicated and the production cost is high; the carbonate precipitation method still needs a high-temperature calcination process; the urea-sodium hydroxide precipitation method is easy to introduce alkali metals Impurities
The powder obtained by the organic method has high purity, small particle size and uniform distribution, but the production cost is high
The hydrothermal method can reduce the reaction temperature, the product has high purity, small particle size, uniform distribution, relatively low cost, and achieves the characteristics of green chemistry such as non-toxic and harmless raw materials, no pollution in the process, and no waste as a result. There are disadvantages of high reaction temperature, high pressure and discontinuity
Method used
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Embodiment Construction
[0019] A doped strontium trioxide strontium titanate (SrTiO 3 0.05Y 2 o 3 ) preparation method, is to first 1.9mL (0.01mol, ρ=1.234g / cm 3 ) titanium sulfate (Ti(SO 4 ) 2 ), slowly added dropwise to a sufficient amount of 2mol / L NaOH solution under strong stirring, after hydrolysis was completed, separated and washed to obtain hydrated titanium oxide TiO 2 ·nH 2 O; then hydrated titanium oxide TiO 2 ·nH 2 O was transferred to a 500mL multi-neck flask with 300mL distilled water, and then 2.7g (0.01mol) of SrCl was added to the multi-neck flask 2 ·6H 2 O and 60g (1.5mol) of NaOH solution, stirred and fed nitrogen or argon at a flow rate of 10mL / min; heated to boiling, refluxed for 2 hours, continued to add 0.383g (0.001mol) of Y (NO 3 ) 3 ·6H 2 O, continue the reflux reaction for 2 hours, after the reaction is completed, export the mixed solution, separate, wash and dry to obtain strontium trioxide doped strontium titanate (SrTiO 3 0.05Y 2 o 3 ) ceramic powder.
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The present invention relates to normal pressure hydrothermally synthesizing process of yttrium oxide blended strontium-barium titanate ceramic powder. The process includes hydrolyzing, separating and washing titanium compound in water solution of sodium hydroxide to obtain hydrated titanium oxide; mixing the hydrated titanium oxide and the concentrated alkali solution of strontium compound in the stoichiometric ratio; normal pressure reflux reaction for 1-5 hr in protective inert gas atmosphere, adding yttrium compound and further reflux reaction for one other 1-5 hr; and separating the reacted mixture solution, washing and drying to obtain the yttrium oxide blended strontium-barium titanate ceramic powder. The prepared yttrium oxide blended strontium-barium titanate ceramic powder has homogeneous granularity and less impurity, and the present invention has simple technological process and low cost, and is suitable for industrial production.
Description
technical field [0001] The invention relates to a preparation method of a multifunctional electronic ceramic material-titanate ceramic powder, in particular to a method for hydrothermally synthesizing doped titanate-strontium trioxide strontium titanate ceramic powder at normal pressure. technical background [0002] Perovskite titanate (mainly: BaTiO 3 , SrTiO 3 , PbTiO 3 , CaTiO 3 ) is a dielectric material and optoelectronic material with a high dielectric constant, and has the characteristics of high capacity, high dispersion frequency, low dielectric loss, and low temperature coefficient. A single titanate material has mixed electronic and ionic conductivities, making it suitable for high-temperature superconducting films, catalysis, high-temperature solid oxide fuel cell electrode materials, electrochemical sensors, various oxide film substrate materials, special optical windows and high-quality Sputtering targets and other aspects are widely used. Doped or compos...
Claims
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IPC IPC(8): C04B35/47C04B35/626
Inventor 贾永忠景燕金山
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI