Method for preparing perovskite-type flaky KNN (potassium sodium niobate) with hydrothermal method

A perovskite type, potassium sodium niobate technology, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve problems such as high reaction temperature, complicated process of molten salt method, and difficult purification of products

Inactive Publication Date: 2015-12-23
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of the molten salt method is complicated, the r

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Weigh 25.25g of potassium hydroxide, 6g of sodium hydroxide, and 0.558g of niobium pentoxide, add the three raw materials into a hydrothermal reaction kettle with a volume of 100ml, add 60ml of deionized water, and stir with a glass rod until there are no obvious particles precipitation.

[0015] 2. Add a magnetic stirrer in the reaction kettle, seal the hydrothermal reaction kettle, control the temperature at 150°C, react for 36 hours, and set the stirring rate at 150r / min.

[0016] 3. After the reaction, the white precipitate was centrifuged, washed three times with deionized water, and then washed once with absolute ethanol. The initial product was obtained by drying at a constant temperature of 80° C. for 24 hours in an air blast drying oven.

[0017] 4. Put the obtained initial product into a muffle furnace at 450° C. for 2 hours, and cool down to room temperature with the furnace to obtain the final product of perovskite-type flaky potassium sodium niobate.

Embodiment 2

[0019] 1. Weigh 33.6g of potassium hydroxide, 8g of sodium hydroxide, and 0.744g of niobium pentoxide, add the three raw materials into a hydrothermal reaction kettle with a volume of 100ml, add 80ml of deionized water, and stir with a glass rod until there are no obvious particles precipitation.

[0020] 2. Add a magnetic stirrer in the reaction kettle, seal the hydrothermal reaction kettle, control the temperature at 150°C, react for 36 hours, and set the stirring rate at 120r / min.

[0021] 3. After the reaction, the white precipitate was centrifuged, washed three times with deionized water, and then washed once with absolute ethanol. The initial product was obtained by drying at a constant temperature of 80° C. for 24 hours in an air blast drying oven.

[0022] 4. Put the obtained initial product into a muffle furnace at 450° C. for 2 hours, and cool down to room temperature with the furnace to obtain the final product of perovskite-type flaky potassium sodium niobate.

Embodiment 3

[0024] 1. Weigh 33.6g of potassium hydroxide, 8g of sodium hydroxide, and 0.744g of niobium pentoxide, add the three raw materials into a hydrothermal reaction kettle with a volume of 100ml, add 80ml of deionized water, and stir with a glass rod until there are no obvious particles precipitation.

[0025] 2. Add a magnetic stirrer in the reaction kettle, seal the hydrothermal reaction kettle, control the temperature at 150°C, react for 15 hours, and set the stirring rate at 150r / min.

[0026] 3. After the reaction, the white precipitate was centrifuged, washed three times with deionized water, and then washed once with absolute ethanol. The initial product was obtained by drying at a constant temperature of 80° C. for 24 hours in an air blast drying oven.

[0027] 4. Put the obtained initial product into a muffle furnace for 2 hours at 600° C., and then cool to room temperature with the furnace to obtain the final product of perovskite-type flaky potassium sodium niobate.

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Abstract

The invention discloses a method for preparing perovskite-type flaky KNN (potassium sodium niobate) with a hydrothermal method and belongs to the field of functional ceramic materials. The method is characterized in that sodium hydroxide, potassium hydroxide and niobium pentoxide are used as raw materials, the concentration of alkali liquor is 10 mol/L, the molar ratio of potassium ions to sodium ions is 3:1, the concentration of the niobium pentoxide is 0.035 mol/L, the hydrothermal reaction temperature is 150 DEG C, the stirring speed is 90-150 r/min, the reaction time is 8-36 h, and an initial product is obtained through centrifugal separation. The initial product is placed in a muffle after being dried and then kept at the temperature of 450-600 DEG C for 2-4 h, and the perovskite-type KNN which is in the hexagonal or round-like flake shape, has the thickness of 0.1-0.5 mu m and has the plane size range of 1.5-4.0 mu m is obtained. According to the method, the raw materials are easy to obtain and low in price, equipment is simple, the technology is easy to control, and the method has brighter application prospect in aspects of preparation of two-dimensional KNN materials and KNN piezoelectric ceramic texturing research.

Description

technical field [0001] The invention discloses a method for preparing perovskite-type flake potassium sodium niobate by a hydrothermal method, which belongs to the field of functional ceramic materials. Background technique [0002] PZT-based ferroelectric / piezoelectric materials have occupied the main market of ferroelectric / piezoelectric materials for a long time because of their excellent piezoelectric properties and compositional tunability. However, their preparation requires the use of a large amount of lead-containing oxides as raw materials, which will cause serious harm to humans and the ecological environment during production, use, and disposal. At present, the research and development of lead-free piezoelectric ceramics mainly focuses on lead-free piezoelectric ceramic systems such as alkali metal niobate and bismuth sodium titanate. Among these lead-free piezoelectric ceramic materials, potassium sodium niobate lead-free piezoelectric ceramic (K,Na)NbO 3 (refe...

Claims

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Application Information

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IPC IPC(8): C01G33/00
Inventor 杨秀英张德庆程章洁石峰
Owner QIQIHAR UNIVERSITY
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