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Hydrothermal synthesis method for sodium niobate powder

A technology of hydrothermal synthesis and sodium niobate, which is applied in the field of hydrothermal synthesis of sodium niobate powder, can solve the problems of agglomeration between powder particles and grain growth of sodium, and achieve the goal of reducing energy consumption and environmental pollution Effect

Inactive Publication Date: 2009-12-09
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods require high-temperature heat treatment in the later stage, resulting in agglomeration and grain growth among powder particles and volatilization of sodium

Method used

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  • Hydrothermal synthesis method for sodium niobate powder
  • Hydrothermal synthesis method for sodium niobate powder
  • Hydrothermal synthesis method for sodium niobate powder

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Niobium pentoxide (Nb 2 o 5 ) and sodium hydroxide (NaOH) put into the autoclave after weighing, the mol ratio of niobium pentoxide and sodium hydroxide is 0.2, according to the filling rate of 75%, add the deionized water of corresponding volume in the autoclave, adjust The amount of raw materials, so that the concentration of sodium hydroxide is 6mol / L, stir slowly with a glass rod to dissolve the sodium hydroxide; to 160 degrees Celsius, keep warm for 16 hours, and then cool with the furnace; take out and open the autoclave, pour the reactants into a beaker, use deionized water to filter and wash repeatedly until the washing liquid becomes neutral, and put the obtained powder into an oven. Bake at 50°C for 8 hours. figure 1 The XRD spectrum of the obtained sodium niobate powder is given.

Embodiment 2

[0017] Niobium pentoxide (Nb 2 o 5 ) and sodium hydroxide (NaOH) put into the autoclave after weighing, the mol ratio of niobium pentoxide and sodium hydroxide is 0.1, according to the filling rate of 70%, add the deionized water of corresponding volume in the autoclave, adjust The amount of raw materials is such that the concentration of sodium hydroxide is 6mol / L, and the sodium hydroxide is slowly stirred with a glass rod to dissolve the sodium hydroxide; to 180 degrees Celsius, keep warm for 20 hours, and then cool with the furnace; take out and open the autoclave, pour the reactants into a beaker, use deionized water to repeatedly filter and wash until the washing liquid becomes neutral, and put the obtained powder into an oven. Bake at 80°C for 6 hours. figure 2 The SEM pictures of the obtained sodium niobate powder are given.

Embodiment 3

[0019] Niobium pentoxide (Nb 2 o 5 ) and sodium hydroxide (NaOH) put into the autoclave after weighing, the mol ratio of niobium pentoxide and sodium hydroxide is 0.5, according to the filling rate of 75%, add the deionized water of corresponding volume in the autoclave, adjust The amount of raw materials is such that the concentration of sodium hydroxide is 4mol / L, and the sodium hydroxide is dissolved by stirring slowly with a glass rod; after sealing the autoclave, put it into a pit furnace or an oven, and raise the temperature at a rate of 1 degree Celsius per minute. to 200 degrees Celsius, keep warm for 12 hours, and then cool with the furnace; take out and open the autoclave, pour the reactants into a beaker, use deionized water to filter and wash repeatedly until the washing liquid becomes neutral, and put the obtained powder into an oven. Bake at 40°C for 10 hours. image 3 The SEM pictures of the obtained sodium niobate powder are given.

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Abstract

The invention discloses a hydrothermal synthesis method for sodium niobate powder, which comprises the following steps: putting niobium pentaoxide and sodium hydroxide in a molar ratio of 0.05-10 into an autoclave, and adding deionized water into the autoclave according to a filling rate between 50 and 90 percent to adjust the concentration of the sodium hydroxide to between 0.1 and 15 mol / L; sealing the autoclave, putting the autoclave into a pit furnace or an oven, raising the temperature to between 120 and 240 DEG C in a temperature rise rate of 1 to 5 DEG C per minute, preserving heat for 4 to 72 hours, and then cooling along with the furnace; and taking out and opening the autoclave, pouring an obtained product into a beaker, repeatedly filtering and washing with deionized water until the washed solution is neutral, putting obtained powder into an oven, and baking at a temperature of between 40 and 100 DEG C for 6 to 24 hours. The method is simple, saves energy, reduces emission, has low cost, and is suitable for mass production; and the prepared sodium niobate powder has high purity, good fluidity, narrow particle size distribution, low degree of particle agglomeration, and perfect crystal growth.

Description

technical field [0001] The invention relates to a hydrothermal synthesis method of sodium niobate powder, belonging to the technical field of inorganic chemical synthesis. Background technique [0002] Sodium niobate (NaNbO 3 ) is an excellent lead-free piezoelectric ceramic. Sodium niobate is an antiferroelectric ceramic. It is mainly used in two aspects: one is to use the double electric hysteresis loop during the antiferroelectric-ferroelectric phase transition as an energy storage container and piezoelectric adjustment element; the other is to use the volume effect of the antiferroelectric-ferroelectric phase transition , used as a transducer. Common methods for preparing sodium niobate powder include sol-gel method and solid phase sintering method. These preparation methods require high-temperature heat treatment in the later stage, resulting in agglomeration and grain growth among powder particles and volatilization of sodium. Compared with other methods, the powd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/495
Inventor 刘来君樊慧庆方亮周焕福陈秀丽
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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