One-step method for synthesizing leadless piezoelectric K0.1Na0.9NbO3 powder by hydrothermal process

A technology of lead-free piezoelectric and hydrothermal method, which is applied in the field of preparation of lead-free piezoelectric ceramic K0.1Na0.9NbO3 powder, can solve the problems of waste of raw materials, complicated operation, long cycle, etc., to reduce the use of raw materials, The preparation process is simple and the preparation cycle is short

Active Publication Date: 2014-10-29
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

For this purpose, chemical precipitation method and sol-gel method have been reported one after another. The above methods are either complicated in operation or complex in process, long in cycle and poor in repeatability.
In contrast, the hydrothermal method has certain advantages in the synthesis of potassium sodium niobate, so it is the method adopted by most researchers; but the traditional hydrothermal method cannot avoid three problems: 1. Due to the interaction between K and Na ions and Nb The binding ability is too different. If it is synthesized by the traditional

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  • One-step method for synthesizing leadless piezoelectric K0.1Na0.9NbO3 powder by hydrothermal process
  • One-step method for synthesizing leadless piezoelectric K0.1Na0.9NbO3 powder by hydrothermal process

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Example Embodiment

[0019] Example 1

[0020] Step 1: Take potassium hydroxide solution A with a concentration of 5 mol / L and sodium hydroxide solution B with a concentration of 5 mol / L; add solution A to uniform solution B at a KOH / NaOH molar ratio of 3:1, Stir uniformly to obtain a mixed solution, add isopropanol in the proportion of 5ml isopropanol per 20ml of the mixed solution to form a mixed lye C, and the total of KOH and NaOH in the mixed lye is x mol;

[0021] Step 2: Massage the ratio x: Niobium pentoxide = 20:1 ratio. Add 0.005mol of niobium pentoxide to the mixed alkali solution, use a magnetic stirrer, stir for 30 minutes to form a uniform precursor solution; pour the precursor solution into the water In the hot reaction kettle, the filling degree is controlled to 80%, and after sealing, it is placed in a thermostat for hydrothermal synthesis at 220°C for 6 hours, and cooled to room temperature to obtain material D;

[0022] Step 3: After the material D is rinsed with deionized water to ne...

Example Embodiment

[0023] Example 2:

[0024] Step 1: Take potassium hydroxide solution A with a concentration of 5 mol / L and sodium hydroxide solution B with a concentration of 5 mol / L; add uniform solution A to uniform solution B at a KOH / NaOH molar ratio of 6:1 In the mixed solution, stir evenly to obtain a mixed solution. Add 5ml isopropanol to each 20ml of the mixed solution to form a mixed lye C. The KOH and NaOH in the mixed lye are x mol;

[0025] Step 2: Massage the ratio x: Niobium pentoxide = 10:1. Add 0.01mol of niobium pentoxide to the mixed alkali solution, use a magnetic stirrer for 60 minutes to form a uniform precursor solution; pour the precursor solution into the water In the hot reaction kettle, the filling degree is controlled to 80%, and after sealing, it is placed in a thermostat for hydrothermal synthesis at a temperature of 180°C for 10 hours, and cooled to room temperature to obtain material D;

[0026] Step 4: After the material D is rinsed with deionized water to neutrality...

Example Embodiment

[0027] Example 3

[0028] Step 1: Take potassium hydroxide solution A with a concentration of 5 mol / L and sodium hydroxide solution B with a concentration of 5 mol / L; add uniform solution A to uniform solution B according to the KOH / NaOH molar ratio of 9:1 In the mixed solution, stir evenly to obtain a mixed solution, add 5ml isopropanol solution to each 20ml of the mixed solution to form a mixed lye C, and the KOH and NaOH in the mixed lye are x mol;

[0029] Step 2: Massage the ratio x: Niobium pentoxide = 20:1 ratio. Add 0.005mol of niobium pentoxide to the mixed alkali solution, use a magnetic stirrer, stir for 30-60 minutes to form a uniform precursor solution; pour the precursor solution Put it into a hydrothermal reaction kettle, control the filling degree to 80%, put it in a thermostat after sealing, perform hydrothermal synthesis at 200°C for 8 hours, and cool to room temperature.

[0030] Step 3: Take out the materials in the reactor and rinse them with deionized water unt...

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Abstract

The invention relates to a preparation method of leadless piezoelectric ceramic K0.1Na0.9NbO3 powder, particularly a one-step method for synthesizing leadless piezoelectric K0.1Na0.9NbO3 powder by a hydrothermal process, which comprises the following steps: 1. respectively taking a 5 mol/L potassium hydroxide solution and a 5 mol/L sodium hydroxide solution, and uniformly mixing according to the KOH:NaOH mole ratio of (3-9):1 to form a mixed alkali solution xmol; 2. adding niobium pentaoxide into the mixed alkali solution according to the mixed alkali solution x:niobium pentaoxide mole ratio of (20-5):1, and magnetically stirring for 30-60 minutes to form an uniform precursor solution; carrying out hydrothermal reaction on the precursor solution at 180-220 DEG C for 6-10 hours, and cooling to room temperature to obtain a material D; and 3. flushing the material D with deionized water to a neutral state, and drying to obtain the K0.1Na0.9NbO3 powder. The method has the advantages of simple technique, favorable repetitiveness and lower requirements for reaction environment; and the prepared K0.1Na0.9NbO3 powder has the advantages of small grain size and high purity.

Description

Technical field [0001] The invention relates to a lead-free piezoelectric ceramic K 0.1 Na 0.9 NbO 3 Powder preparation method, especially a hydrothermal method for one-step synthesis of K 0.1 Na 0.9 NbO 3 Powder method. Background technique [0002] In recent years, the alkali metal niobate, namely NaNbO, which has received much attention as an electro-optical material 3 , KNbO 3 Waiting for ABO 3 Compared with lead-based piezoelectric ceramics such as PZT, the type compound has more excellent properties in all aspects, that is, low dielectric constant, high frequency constant, high piezoelectricity and low density. The development of lead-free electronic products is in line with the sustainable development trend of human society, so the research and development of lead-free piezoelectric ceramics has become a research hotspot. In addition, because metal ions such as Nb, Na, and K are non-toxic to the human body and the natural environment, and NaNbO 3 -KNbO 3 After improving th...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/626
Inventor 蒲永平刘雨雯靳乾
Owner SHAANXI UNIV OF SCI & TECH
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