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Method for synthesizing nano potassium tantalate niobate powder

A technology of potassium and sodium tantalum niobate and powder is applied in the field of ultrasonic-assisted hydrothermal synthesis of nanometer potassium and sodium tantalum niobate (O3) piezoelectric ceramic powder, and can solve the problem of inability to synthesize potassium and sodium tantalum niobate nanometer powder. , to achieve good commercial value, environmental friendliness, and improved electromechanical performance.

Inactive Publication Date: 2011-09-07
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for ultrasonically assisted hydrothermal synthesis of nanoscale sodium potassium tantalum niobate powder for the problem that existing methods cannot synthesize potassium sodium tantalum niobate powder (less than 100nm).

Method used

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  • Method for synthesizing nano potassium tantalate niobate powder
  • Method for synthesizing nano potassium tantalate niobate powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, according to the molar ratio of sodium hydroxide and potassium hydroxide: 1:9, concentration: 6mol / L, prepare 800ml of lye, and put it into figure 1 In the ultrasonic-assisted hydrothermal equipment shown;

[0020] Then according to tantalum pentoxide and niobium pentoxide molar ratio 1: 10, be 1: 10 with the mol ratio of total amount and lye, add in the lye of step up and be made up of niobium pentoxide and tantalum pentoxide solid oxide;

[0021] The power of ultrasonic-assisted hydrothermal equipment is 20KW, the reaction temperature is 120°C, and the holding time is 4 hours. After the reaction is completed, take it out after the furnace temperature drops to room temperature, filter, centrifuge, and wash it several times, then place it in a blast drying oven at a temperature of 80°C, and dry for 6 hours to obtain potassium sodium tantalum niobate nanopowder.

[0022] result:

[0023] Potassium sodium tantalum niobate nano powder particle size d 50 = 75nm. ...

Embodiment 2

[0025] First, according to the molar ratio of sodium hydroxide and potassium hydroxide: 1:9, concentration: 6mol / L, prepare 800ml of lye, and put it into figure 1 Ultrasound-assisted hydrothermal equipment (as shown);

[0026] Then according to tantalum pentoxide and niobium pentoxide molar ratio 1: 10, be 1: 10 with the mol ratio of total amount and lye, add in the lye of step up and be made up of niobium pentoxide and tantalum pentoxide Peripheral oxides;

[0027] The power of ultrasonic-assisted hydrothermal equipment is 20KW, the reaction temperature is 160°C, and the holding time is 2 hours. After the reaction is completed, take it out after the furnace temperature drops to room temperature, filter, centrifuge, and wash it several times, then place it in a blast drying oven at a temperature of 80°C, and dry for 6 hours to obtain potassium sodium tantalum niobate nanopowder.

[0028] The result is:

[0029] Potassium sodium tantalum niobate nano powder particle size d ...

Embodiment 3

[0031] First according to sodium hydroxide and potassium hydroxide molar ratio: 3: 7, concentration: 10mol / L, prepare lye 800ml, and pack into ultrasonic auxiliary hydrothermal equipment (such as figure 1 shown);

[0032] Then according to tantalum pentoxide and niobium pentoxide molar ratio 1: 10, be 1: 10 with the mol ratio of total amount and lye, add in the lye of step up and be made up of niobium pentoxide and tantalum pentoxide solid oxide;

[0033] The power of ultrasonic-assisted hydrothermal equipment is 20KW, the reaction temperature is 120°C, and the holding time is 4 hours. After the reaction is completed, take it out after the furnace temperature drops to room temperature, filter, centrifuge, and wash it several times, then place it in a blast drying oven at a temperature of 80°C, and dry for 6 hours to obtain potassium sodium tantalum niobate nanopowder.

[0034] The result is:

[0035] Potassium sodium tantalum niobate nano powder particle size d 50 = 50nm. ...

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Abstract

The invention discloses an ultrasonic assisted thermosynthesis method for preparing nano potassium tantalate niobate powder. The method comprises the following steps: (1) putting alkali liquor prepared from sodium hydroxide and potassium hydroxide in an ultrasonic assisted hydrothermal device; and (2) adding solid oxide consisting of niobium pentaoxide and tantalum oxide to the alkali liquor prepared in the step (1) for reaction. By using the method, the electromechanical properties of the system are greatly improved; and the nano potassium tantalate niobate powder can be used for preparing the lead-free piezoelectric ceramic of the system, wherein the lead-free piezoelectric ceramic is expected to replace lead zirconate titanate series piezoelectric ceramic, is environment-friendly, has more environment-friendly production process and has a good commercial value.

Description

technical field [0001] The invention relates to the field of functional ceramics, in particular to an ultrasonic-assisted hydrothermal method for synthesizing nanometer sodium potassium tantalum niobate ((K, Na)(Nb, Ta)O 3 ) method of piezoelectric ceramic powder. Background technique [0002] Lead-based ferroelectric piezoelectric ceramics will cause damage to the ecological environment in the process of production, use and disposal, and lead pollution has become one of the public hazards of human beings. With the enhancement of people's awareness of environmental protection and the demand for sustainable social development, research on new environment-friendly ferroelectric piezoelectric ceramics has become one of the hot spots in the research and development of countries all over the world. The premise of preparing lead-free ferroelectric ceramics is to synthesize high-quality powders, especially nanoscale (less than 100nm) ferroelectric ceramic powders, and using nanosc...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/626
Inventor 陈海刘伯洋范春华
Owner SHANGHAI MARITIME UNIVERSITY
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