Microwave hydro-thermal synthesis method for sodium niobate potassium niobate leadless piezoelectric ceramic powder

A microwave hydrothermal and ceramic powder technology, applied in chemical instruments and methods, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problems of high sintering temperature, high energy consumption, high heat treatment temperature, etc. Achieve the effect of wide application prospect, low cost and simple process

Inactive Publication Date: 2008-05-28
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] KbO 3 Using the traditional solid state sintering method, the sintering temperature is high (generally higher than 1000°C), and the K 2 O is volatile and easy to volatilize at high temperature, especially in a humid sintering atmosphere, this effect will be more obvious, the ratio of K and Nb is difficult to control, the

Method used

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  • Microwave hydro-thermal synthesis method for sodium niobate potassium niobate leadless piezoelectric ceramic powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The process flow is as follows:

[0021] 1. Configure a sodium hydroxide solution with a concentration of 6mol / L, and the volume of the solution is 60ml;

[0022] 2. Weigh 3.75 grams (0.0141mol) Nb 2 o 5 Powder;

[0023] 3. Add Nb 2 o 5 Mix the powder with potassium hydroxide solution and put it into a polytetrafluoroethylene hydrothermal kettle, keep the filling degree of 50%, and stir for 1 hour until the mixture is uniform;

[0024] 4. Put the hydrothermal kettle into the microwave oven, adjust the power knob, control the reaction temperature at 110-150°C, and keep it warm for 2-6h.;

[0025] 5. After the reaction is complete, a white precipitate can be seen on the bottom of the inner substrate. In order to detect whether there is soluble niobate in the solution, pour the supernatant in the inner lining into a beaker and add hydrochloric acid dropwise until neutral;

[0026] 6. Use deionized water to centrifuge the white sediment at the bottom of the inner subs...

Embodiment 2

[0030] The process flow is as follows:

[0031] 1. Configure a potassium hydroxide solution with a concentration of 6mol / L, and the volume of the solution is 60ml;

[0032] 2. Weigh 3.75 grams (0.0141mol) Nb 2 o 5 Powder;

[0033] 3. Add Nb 2 o 5 Mix the powder with KOH solution and put it into a polytetrafluoroethylene hydrothermal kettle, keep the filling degree of 50%, and stir for 1 hour until the mixture is uniform;

[0034] 4. Put the hydrothermal kettle into the microwave oven, adjust the power knob, control the reaction temperature at 110-150°C, and keep it warm for 10-24h;

[0035] 5. After the reaction is complete, a white precipitate can be seen on the bottom of the inner substrate. In order to detect whether there is soluble niobate in the solution, pour the supernatant in the inner lining into a beaker and add hydrochloric acid dropwise until neutral;

[0036] 6. Use deionized water to centrifuge the white sediment at the bottom of the inner substrate severa...

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Abstract

The invention relates to a microwave hydrothermal synthesis method for preparation of sodium-potassium and niobate-potassium lead-free piezoelectric ceramic powder, which belongs to the functional material field. The invention is characterized in that: NaOH or KOH solution and Nb2O5 are used as reactants; NaNbO3 or KNbO3 ceramic powder is synthesized by microwave hydrothermal technology; the concentration of NaOH or KOH is 4-8mol/L while the input amount of the Nb2O5 is 0.01 to 0.02 mol; and the reaction temperature is 110 to 150 DEG C and the heat is preserved for 2 to 6 hours. The microwave hydrothermal synthesis method for preparation of sodium-potassium and niobate-potassium lead-free piezoelectric ceramic powder combines the unique heating features of a microwave and the advantage of the hydrothermal method, thus having simple technique, low cost, low consumption and very wide application prospect.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a synthesis method of sodium niobate potassium niobate lead-free piezoelectric ceramic powder. Background technique: [0002] At present, lead-free piezoelectric materials are mainly divided into BaTiO 3 There are several types of lead-free piezoelectric ceramics based on lead-free piezoelectric ceramics, BNT-based lead-free piezoelectric ceramics, bismuth layered lead-free piezoelectric ceramics, and niobate-based lead-free piezoelectric ceramics. Among them, the alkali metal niobate has attracted people's attention because of its high Curie point and antiferroelectricity. [0003] Sodium niobate and potassium niobate are dielectric materials with orthorhombic crystal structure. They have antiferroelectricity at room temperature. The range of antiferroelectricity is -100~+360℃, and they show ferroelectricity below 0℃. NaNbO doped with a small amount of Li or K 3 , KNbO 3 Mat...

Claims

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Application Information

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IPC IPC(8): C01G33/00C04B35/495H01L41/187
Inventor 张梅郭敏王习东周媛张慈
Owner UNIV OF SCI & TECH BEIJING
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